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Advanced pseudocapacitive lithium titanate towards next-generation energy storage devices
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作者 Hao Ge Longhui Xie +6 位作者 Chaoyue Wang Ruicong Pan Bei Huang Zhijia Sun Xiaoman Cao Tianhua Yang Gang Wu 《Journal of Energy Chemistry》 2025年第4期773-792,共20页
The progression of anodes has markedly promoted the advancement of lithium-ion batteries(LIBs).Typical LIBs using carbon anodes cannot meet the continuously increasing demands for qualified safety and longevity.Spinel... The progression of anodes has markedly promoted the advancement of lithium-ion batteries(LIBs).Typical LIBs using carbon anodes cannot meet the continuously increasing demands for qualified safety and longevity.Spinel lithium titanate(LTO)is a strong contender to replace graphite anodes due to its optimal zero-strain merit and outstanding structural stability.Nevertheless,low reversible capacity and poor rate performance hinder the widespread application of LTO.Amazingly,the promising pseudocapacitive effect enables LTO to surmount the limit of theoretical capacity via boosted surface Li storage,contributing to observably upgraded energy and power densities in a wide temperature range.By leveraging the synergistic effect of multiple modification strategies to create additional active sites,the pseudocapacitive response of LTO can be markedly enhanced.This paper reviews the progress of pseudocapacitive LTO for the first time.We highlight the zero-strain characteristic and pseudocapacitance mechanism of LTO and review the design strategies of pseudocapacitive LTO.Significative issues for further developing pseudocapacitive LTO are proposed.It is worth noting that the pseudocapacitive contribution can greatly improve the low-temperature electrochemical performances of LTO.We anticipate that more efforts will be aroused to study the advanced pseudocapacitive LTO to accelerate the development of next-generation LIBs and energy storage devices. 展开更多
关键词 Spinel lithium titanate Li_(4)Ti_5O_(12) Pseudocapacitive effect Lithium-ion batteries Zero-strain
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Spinel lithium titanate (Li_4Ti_5O_(12)) as novel anode material for room-temperature sodium-ion battery 被引量:13
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作者 Zhao Liang Pan Hui-Lin +2 位作者 Hu Yong-sheng Li Hong Chen Li-quan 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第2期32-35,共4页
This is the first time that a novel anode material, spinel Li4Ti5O12 which is well known as a "zero-strain" anode material for lithium storage, has been introduced for sodium-ion battery. The Li4Ti5O12 shows an aver... This is the first time that a novel anode material, spinel Li4Ti5O12 which is well known as a "zero-strain" anode material for lithium storage, has been introduced for sodium-ion battery. The Li4Ti5O12 shows an average Na storage voltage of about 1.0 V and a reversible capacity of about 145 mAh/g, thereby making it a promising anode for sodiumion battery. Ex-situ X-ray diffraction (XRD) is used to investigate the structure change in the Na insertion/deinsertion process. Based on this, a possible Na storage mechanism is proposed. 展开更多
关键词 SPINEL lithium titanate LI4TI5O12 sodium-ion battery
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Burning rate and other characteristics of strontium titanate (SrTiO3) supplemented AP/HTPB/Al composite propellants 被引量:4
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作者 Sunil Jain Garima Gupta +2 位作者 Dhirendra R. Kshirsagar Vrushali H. Khire Balasubramanian Kandasubramanian 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2019年第3期313-318,共6页
In a quest of search for a new burning rate modifier for composite propellant, strontium titanate (SrTiO3), a perovskite oxide has been chosen for evaluation in a composite propellant formulation based on its other ca... In a quest of search for a new burning rate modifier for composite propellant, strontium titanate (SrTiO3), a perovskite oxide has been chosen for evaluation in a composite propellant formulation based on its other catalytic applications. Initially, SrTiO3 was characterized for particle size, morphology and material/ phase identification (using XRD). By varying SrTiO3 content in a standard composite propellant, different compositions were prepared and their performance and processing parameters like the end of mix (EOM) viscosity, mechanical properties, density, burning rate, pressure exponent (n-value), etc. were measured. The results reveal that 2% SrTiO3 causes more than 12% enhancement in propellant burning rate (at 70 ksc pressure) in comparison to the standard propellant composition. The pressure exponent also increases to 0.46, whereas the standard composition was having its value as 0.35. 展开更多
关键词 STRONTIUM titanate AMMONIUM PERCHLORATE Composite PROPELLANT Burning rate
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Optimized growth and dielectric properties of barium titanate thin films on polycrystalline Ni foils 被引量:4
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作者 梁伟正 吉彦达 +5 位作者 南天翔 黄江 曾慧中 杜辉 陈充林 林媛 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第6期498-503,共6页
Barium titanate(BTO) thin films were deposited on polycrystalline Ni foils by using the polymer assisted deposition(PAD) technique.The growth conditions including ambient and annealing temperatures were carefully ... Barium titanate(BTO) thin films were deposited on polycrystalline Ni foils by using the polymer assisted deposition(PAD) technique.The growth conditions including ambient and annealing temperatures were carefully optimized based on thermal dynamic analysis to control the oxidation processing and interdiffusion.Crystal structures,surface morphologies,and dielectric performance were examined and compared for BTO thin films annealed under different temperatures.Correlations between the fabrication conditions,microstructures,and dielectric properties were discussed.BTO thin films fabricated under the optimized conditions show good crystalline structure and promising dielectric properties with εr~ 400 and tan δ 〈 0.025 at 100 kHz.The data demonstrate that BTO films grown on polycrystalline Ni substrates by PAD are promising in device applications. 展开更多
关键词 polymer assisted deposition barium titanate nickel foils thin films thermodynamics dielectric properties
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Fabrication of porous lithium titanate self-supporting anode for high performance lithium-ion capacitor 被引量:2
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作者 Yan Liu Wenqiang Wang +3 位作者 Jin Chen Xingwei Li Qilin Cheng Gengchao Wang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第11期344-350,共7页
Lithium titanate has unique "zero-strain" characteristics, which makes it promising for rapid energy storage lithium-ion capacitors. However, extremely low electronic conductivity and lithium ion diffusion c... Lithium titanate has unique "zero-strain" characteristics, which makes it promising for rapid energy storage lithium-ion capacitors. However, extremely low electronic conductivity and lithium ion diffusion coefficient severely limit its performance at high rate. Herein, we have constructed in situ clusters of porous lithium titanate nanoparticles on self-supporting carbon nanotube film by combining iron oxide hard template method and F127 soft template method. Due to the nano-structured particle size and the penetrating lithium ion transmission channel, a greatly improved lithium ion diffusion coefficient has been achieved, which brings significantly better electrochemical performance than dense lithium titanate. By assembling with a durable graphene foam cathode, a lithium-ion capacitor with an energy density of up to 101.8 Wh kg-1 was realized(at a power density of 436.1 W kg-1). And its capacitance retention reaches 84.8% after 5000 cycles. With such an alluring result, our work presents a novel lithium-ion capacitor system with practical application prospects. 展开更多
关键词 Lithium titanate Graphene foam Ion transmission Hybrid capacitor
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Artificial solid electrolyte interface layer based on sodium titanate hollow microspheres assembled by nanotubes to stabilize zinc metal electrodes 被引量:2
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作者 Minfeng Chen Weijun Zhou +4 位作者 Qinghua Tian Xiang Han Yanjun Tan Jizhang Chen Ching-Ping Wong 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第8期539-546,I0015,共9页
Recently,aqueous zinc-ion batteries with intrinsic safety,low cost,and environmental benignity have attracted tremendous research interest.However,zinc dendrites,harmful side reactions,and zinc metal corrosion stand i... Recently,aqueous zinc-ion batteries with intrinsic safety,low cost,and environmental benignity have attracted tremendous research interest.However,zinc dendrites,harmful side reactions,and zinc metal corrosion stand in the way.Herein,we use lepidocrocite-type sodium titanate hollow microspheres assembled by nanotubes to constitute an artificial solid electrolyte interface layer on the zinc metal electrode.Thanks to the hierarchical structure with abundant open voids,negative-charged layered framework,low hydrophilicity,electrically insulting nature,and large ionic conductivity,the sodium titanate coating layer can effectively homogenize the electric field,promote the Zn^(2+)ion transfer,guide the Zn^(2+)ion flux,reduce the desolvation barrier,improve the exchange current density,and accommodate the plated zinc metal.Consequently,this coating layer can effectively suppress zinc dendrites and other unfavorable effects.With this coating layer,the Zn//Zn symmetric cell is able to provide an impressive cumulative zinc plating capacity of 1375 m Ah cm^(-2) at a current density of 5 m A cm^(-2).This coating layer also contributes to significantly improved electrochemical performances of Zn//MnO_(2) battery and zincion hybrid capacitor.This work offers new insights into the modifications of zinc metal electrodes. 展开更多
关键词 Artificial SEI layers Hierarchical sodium titanates Interfacial stability Dendrite inhibition Aqueous Zn-ion batteries
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Electro-rheological Effect of Barium Titanate Particles Coated with Urea and Suspended in Methyl Silicone Oil 被引量:1
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作者 ZHANG Xu-ping XU Ling-li WANG Qing-liang 《Journal of China University of Mining and Technology》 EI 2007年第4期578-581,共4页
Barium titanate nano-powders were synthesized under defined conditions. The surface of these particles was successfully modified by coating with urea. The characteristics of these composite particles were studied by X... Barium titanate nano-powders were synthesized under defined conditions. The surface of these particles was successfully modified by coating with urea. The characteristics of these composite particles were studied by X-ray diffraction,transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy. The electro-rheological (ER) effects of these particles suspended in methyl-silicone oil were measured. The particle,methyl-silicon oil ratio was 30%-35% weight percent. The experimental results indicate that these ER particles exhibit a remarkable ER effect. The ER fluid shows Bingham characteristics and the static shearing stress increases with an increase of the electric field strength. The highest static shearing stress under a 4 MV/m electric field is 13.2 kPa at room temperature,an increase of about 8.7 kPa compared to untreated BaTiO(C2O4)2 powders. 展开更多
关键词 Barium titanate electro-rheological fluid UREA sheafing stress
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Ag-modified hydrogen titanate nanowire arrays for stable lithium metal anode in a carbonate-based electrolyte 被引量:1
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作者 Zhipeng Wen Dongzheng Wu +4 位作者 Hang Li Yingxin Lin Hang Li Yang Yang Jinbao Zhao 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2021年第3期282-290,共9页
In the investigation of the next-generation battery anode,Li metal has attracted increasing attention owing to its ultrahigh specific capacity and low reduction potential.However,its low columbic efficiency,limited cy... In the investigation of the next-generation battery anode,Li metal has attracted increasing attention owing to its ultrahigh specific capacity and low reduction potential.However,its low columbic efficiency,limited cycling life,and serious safety hazards have hindered the practical application of rechargeable Li metal batteries.Although several strategies have been proposed to enhance the electrochemical performance of Li metal anodes,most are centered around ether-based electrolytes,which are volatile and do not provide a sufficiently large voltage window.Therefore,we aimed to attain stable Li deposition/stripping in a commercial carbonate-based electrolyte.Herein,we have successfully synthesized hydrogen titanate(HTO)nanowire arrays decorated with homogenous Ag nanoparticles(NPs)(Ag@HTO)via simple hydrothermal and silver mirror reactions.The 3 D cross-linked array structure with Ag NPs provides preferable nucleation sites for uniform Li deposition,and most importantly,when assembled with the commercial LiNi_(0.5)Co0.2Mn_(0.3)O_(2) cathode material,the Ag@HTO could maintain a capacity retention ratio of 81.2% at 1 C after 200 cycles,however the pristine Ti foil failed to do so after only 60 cycles.Our research therefore reveals a new way of designing current collectors paired with commercial high voltage cathodes that can create high energy density Li metal batteries. 展开更多
关键词 Hydrogen titanate nanowire arrays Ag nanoparticles Li metal anode Carbonate-based electrolyte
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Josephson effect in the strontium titanate/lanthanum aluminate junction
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作者 Xing Yang Jie Chen +1 位作者 Yabin Yu Quanhui Liu 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第9期327-331,共5页
We report theoretical studies on the newly discovered novel Josephson effect and scanning tunneling spectroscopy(STS) at the interface of strontium titanate/lanthanum aluminate(STO/LAO).With a phenomenological boson-f... We report theoretical studies on the newly discovered novel Josephson effect and scanning tunneling spectroscopy(STS) at the interface of strontium titanate/lanthanum aluminate(STO/LAO).With a phenomenological boson-fermion model, the density of states is calculated and the results are consistent with the STS experiments.A typical calculation of Josephson effect is performed, and it is in qualitative agreement with the experiments.The calculations indicate that the gap states come from the pairing of quasi-particles with a finite total momentum and the Josephson current comes from the tunneling of quasi-particle pairs with zero momentum.The quasi-particles are Bogoliubov quasi-particles.Moreover, the fits using Kulik's formula imply that the Josephson junction at the STO/LAO interface has a point contact with the clean superconductor limit. 展开更多
关键词 STRONTIUM titanate/lanthanum ALUMINATE JOSEPHSON effect scanning tunneling spectroscopy PSEUDOGAP
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Synthesis and characterization of highly-ordered barium-strontium titanate nanotube arrays fabricated by sol-gel method
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作者 陈煜 程伟 +3 位作者 郭峰 李美亚 刘威 赵兴中 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第9期3922-3927,共6页
Highly uniformed barium-strontium titanate nanotube arrays were fabricated using a porous anodic aluminum oxide template from a barium-strontium titanate sol-gel solution. Electron microscope results showed that nanot... Highly uniformed barium-strontium titanate nanotube arrays were fabricated using a porous anodic aluminum oxide template from a barium-strontium titanate sol-gel solution. Electron microscope results showed that nanotubes with uniform length and diameter were obtained. The diameters and lengths of these nanotubes were dependent on the pore diameter and the thickness of the applied anodic aluminum oxide template. High resolution transmission electron microscopy and the selected-area electron diffraction pattern investigations demonstrated the perovskite structure and the polycrystalline of the fabricated barium-strontium titanate nanotubes. The characterization of the electrical and dielectric properties had also been made. Compared to thin film material, the intrinsic leakage current density is almost the same. Besides, at 30 ℃ the dielectric constant and dielectric loss of the fabricated nanotube is 80 and 0.027 at 1 MHz respectively. 展开更多
关键词 NANOTUBES barium-strontium titanate SOL-GEL
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Synthesis and Growth Mechanism of Net-like Titanate Nanowire Films via Low-temperature and Low-alkali-concentration Route
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作者 Xinwen Huang Zongjian Liu 《Nano-Micro Letters》 SCIE EI CAS 2013年第2期93-100,共8页
Net-like titanate nanowire films can be grown on Ti substrates by non-hydrothermal treatment of Ti foils in alkali-H_2O_2 aqueous solutions with a low alkali concentration of 2 M at 60-80. The growth mechanism of such... Net-like titanate nanowire films can be grown on Ti substrates by non-hydrothermal treatment of Ti foils in alkali-H_2O_2 aqueous solutions with a low alkali concentration of 2 M at 60-80. The growth mechanism of such films has been investigated by identifying the role of both H_2O_2 and alkali in the nanowire formation and capturing the film morphology at early growth stages. It is found that the presence of H_2O_2 is necessary for the nanowire growth, and sufficient amount of H_2O_2 is needed to produce well-shaped nanowires.The nanowire growth is also strongly dependant on the alkali used, and nanowire films are formed only when metal hydroxides which can react with TiO_2 to form layer-structured titanates are chosen. Our results have also revealed that the heterogeneous deposition of titanate on Ti substrate results in the growth of titanate sheets, and the nanowire formation is via a splitting process by which each titanate sheet gradually evolves into nanowire thin layer. Based on the experimental results, a detailed mechanism is proposed for the growth of titanate nanowire films in alkali-H_2O_2 aqueous solutions at low temperature. 展开更多
关键词 Nanostructured materials NANOWIRES SYNTHESIS Thin films titanate
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Lead zirconate titanate behaviors in an LDMOS
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作者 翟亚红 李威 +5 位作者 李平 李俊宏 胡滨 霍伟荣 范雪 王刚 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第7期578-581,共4页
The behaviors of lead zirconate titanate (PZT) deposited as the dielectric for high-voltage devices are investigated experimentally and theoretically. The devices demonstrate not only high breakdown voltages above 3... The behaviors of lead zirconate titanate (PZT) deposited as the dielectric for high-voltage devices are investigated experimentally and theoretically. The devices demonstrate not only high breakdown voltages above 350 V, but also excellent memory behaviors. A drain current–gate voltage (ID-VG) memory window of about 2.2 V is obtained at the sweep voltages of ±10 V for the 350-V laterally diffused metal oxide semiconductor (LDMOS). The retention time of about 270 s is recorded for the LDMOS through a controlled ID-VG measurement. The LDMOS with memory behaviors has potential to be applied in future power conversion circuits to boost the performance of the energy conversion system. 展开更多
关键词 laterally diffused metal oxide semiconductor (LDMOS) lead zirconate titanate memory behavior RETENTION
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Thermoelectric enhancement in triple-doped strontium titanate with multi-scale microstructure
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作者 Zheng Cao Qing-Qiao Fu +7 位作者 Hui Gu Zhen Tian Xinba Yaer Juan-Juan Xing Lei Miao Xiao-Huan Wang Hui-Min Liu Jun Wang 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第9期469-475,共7页
Strontium titanate(SrTiO_(3))is a thermoelectric material with large Seebeck coefficient that has potential applications in high-temperature power generators.To simultaneously achieve a low thermal conductivity and hi... Strontium titanate(SrTiO_(3))is a thermoelectric material with large Seebeck coefficient that has potential applications in high-temperature power generators.To simultaneously achieve a low thermal conductivity and high electrical conductivity,polycrystalline SrTiO_(3)with a multi-scale architecture was designed by the co-doping with lanthanum,cerium,and niobium.High-quality nano-powders were synthesized via a hydrothermal method.Nano-inclusions and a nano/micro-sized second phase precipitated during sintering to form mosaic crystal-like and epitaxial-like structures,which decreased the thermal conductivity.Substituting trivalent Ce and/or La with divalent Sr and substituting pentavalent Nb with tetravalent Ti enhanced the electrical conductivity without decreasing the Seebeck coefficient.By optimizing the dopant type and ratio,a low thermal conductivity of 2.77 W·m^(-1)·K^(-1)and high PF of 1.1 mW·m^(-1)·K^(-2)at 1000 K were obtained in the sample co-doped with 5-mol%La,5-mol%Ce,and 5-mol%Nb,which induced a large ZT of 0.38 at 1000 K. 展开更多
关键词 strontium titanate multiple-doping multi-scale microstructure nano-inclusions
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Selective Oxidation of PM over Li Doped Potassium Titanate Catalysts
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作者 Meng Xiuhong Gao Yuan +1 位作者 Wang Qiang Duan Linhai 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2012年第2期50-54,共5页
K2Ti2O5 and LixK2-xTi2O5 samples with varying K contents (x=0.125, 0.15, 0.3), targeted on removal of two main environmental pollutants: PM and NOx, were synthesized by the solid state method using TiO2, KNO3 and L... K2Ti2O5 and LixK2-xTi2O5 samples with varying K contents (x=0.125, 0.15, 0.3), targeted on removal of two main environmental pollutants: PM and NOx, were synthesized by the solid state method using TiO2, KNO3 and LiOH-H2O as starting materials and were characterized by X-ray diffractometry, scanning electron microscopy, and BET. The catalytic activity of titanate catalysts on PM oxidation was evaluated using the temperature programmed oxidation (TPO) method. The test results showed that the perovskite structure of K2Ti205 was still retained after doping a small amount of Li, and the catalytic performance of LixK2-xTi2O5 had been improved significantly compared with that of K2Ti2O5. Li0.15K1.85Ti205 catalyst had the highest catalytic activity with an ignition temperature of 210℃ and a peak temperature of 290℃. The catalytic activity of both K2Ti2O5 and LixK2-xTi2O5 under intimate contact was higher than that under loose contact. When the exhaust gas flow rate was around 100 mL/min, the catalyst samples showed a highest activity. The Li doped K2Ti2O5 could be an excellent candidate for PM oxidation due to its high oxidation activity, water stability, resistance to sulfur poisoning and economical advantages. 展开更多
关键词 potassium titanates diesel PM PM oxidation Li doping
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Preparation and Catalytic Performance of Potassium Titanate Used as Soot Oxidation Catalyst
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作者 Gao Yuan Meng Xiuhong +2 位作者 Pan Lihong Song Lijuan Duan Linhai 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2013年第2期31-36,共6页
To prepare potassium titanate catalyst, a novel citrate acid complex-combustion method using CH3COOK and Ti(OC4H9)4 as raw materials was developed. The crystalline phase and surface morphology of K2Ti205 were invest... To prepare potassium titanate catalyst, a novel citrate acid complex-combustion method using CH3COOK and Ti(OC4H9)4 as raw materials was developed. The crystalline phase and surface morphology of K2Ti205 were investigated by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM) and transmission electron microscope (TEM). The impact of some factors, such as the type of contact between K2Ti205 and soot, the content of water vapor and SO2 in exhaust, and the repeated use on catalytic activity of K2Ti205 were studied by temperature programmed reaction (TPR). A comparison between the new method and the reported ones on catalytic activity of potassium titanate was investigated. The results showed that K2Ti205 had high catalytic activity and good stability. 展开更多
关键词 citrate acid complex-combustion method diesel exhaust potassium titanate soot oxidation
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Efficient removal of Co(Ⅱ)from aqueous solution by titanate sodium nanotubes
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作者 Dong-Mei Li Fei-Ze Li +7 位作者 Jia-Li Liao Ji-Jun Yang Bing Li Yun-Ming Chen Yuan-You Yang Jin-Song Zhang Jun Tang Ning Liu 《Nuclear Science and Techniques》 SCIE CAS CSCD 2016年第6期115-124,共10页
In this paper,a novel material for Co(Ⅱ)adsorption,titanate sodium nanotubes(Na_2Ti_2O_5-NTs)were synthesized and characterized,and then they were used to remove Co(Ⅱ) from aqueous solution and compared with titanic... In this paper,a novel material for Co(Ⅱ)adsorption,titanate sodium nanotubes(Na_2Ti_2O_5-NTs)were synthesized and characterized,and then they were used to remove Co(Ⅱ) from aqueous solution and compared with titanic acid nanotubes(H_2Ti_2O_5-NTs) and potassium hexatitanate whiskers(K_2Ti_6O_(13)).The results showed that the adsorption of Co(Ⅱ) on the materials was dependent on p H values and was a spontaneous,endothermic process.Specifically,Na_2Ti_2O_5-NTs exhibited much more efficient ability to adsorb Co(Ⅱ) from aqueous solution,with the maximum adsorption capacity of 85.25 mg/g.Furthermore,Na_2Ti_2O_5-NTs could selectively adsorb Co(Ⅱ) from aqueous solution containing coexisting ions(Na^+,K^+,Mg^(2+),and Ca^(2+)).The results suggested that Na_2Ti_2O_5-NTs were potential effective adsorbents for removal of Co(Ⅱ) or cobalt-60 from wastewater. 展开更多
关键词 钛酸纳米管 钴(Ⅱ) 水溶液 CO(Ⅱ) 六钛酸钾晶须 新型材料 CO吸附
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Local Structure Analysis of Lead Zinc Niobate-Barium Titanate Ceramic by X-Ray Absorption Spectroscopy and Density Functional Calculation
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作者 Kanokwan Kanchiang Phakkhananan Pakawanit Rattikorn Yimnirun 《Chinese Physics Letters》 SCIE CAS CSCD 2017年第8期113-116,共4页
The local structure of an alternative Pb(Zn1/3Nb2/3)O3-based perovskite ceramic is investigated. The 0.07BaTiO33-0.93Pb(Zn1/3Nb2/3)O3 ceramic is synthesized using a combination of Zn3Nb2O8 B-site precursor and BaT... The local structure of an alternative Pb(Zn1/3Nb2/3)O3-based perovskite ceramic is investigated. The 0.07BaTiO33-0.93Pb(Zn1/3Nb2/3)O3 ceramic is synthesized using a combination of Zn3Nb2O8 B-site precursor and BaTiO33 perovskite phase stabilizer. Then, x-ray absorption spectroscopy and density functional theory are employed to calculate the local structure configuration and formation energy of the prepared samples. Ba2+ is found to replace Pb2+ in AA-site with Zn2+ occupying BB-site in Pb(Zn1/3Nb2/3)O3, while in the neighboring structure, Ti4+4+ replaces Nb5+5+ in BB-site with Pb2+2+ occupying AA-site. With the substitution of BaTiO33 in Pb(Zn1/3Nb2/3)O3, the bond length between Zn2+ and Pb2+ is longer than that of the typical perovskite phase of Pb(Zn1/3Nb2/3)O3. This indicates the key role of BaTiO33 in decreasing the steric hindrance of Pb2+ lone pair, and the mutual interactions between Pb2+ lone pair and Zn2+ and the formation energy is seen to decrease. This finding of the formation energy and local structure configuration relationship can further extend a fundamental understanding of the role of BaTiO33 in stabilizing the perovskite phase in PbZn13Nb23O3-based materials, which in turn will lead to an improved preparation technique for desired electrical properties. 展开更多
关键词 PB Local Structure Analysis of Lead Zinc Niobate-Barium titanate Ceramic by X-Ray Absorption Spectroscopy and Density Functional Calculation EXAFS BA XANES Zn
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Erratum to "Spinel lithium titanate (Li_4Ti_5O_(12)) as novel anode material for room-temperature sodium-ion battery"
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作者 赵亮 潘慧霖 +2 位作者 胡勇胜 李泓 陈立泉 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第7期627-627,共1页
关键词 SPINEL lithium titanate LI4TI5O12 sodium-ion battery
全文增补中
锂离子电池在风电场储能系统中放电性能和容量变化研究
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作者 高阳 葛天翔 +1 位作者 杨斌 刘颖明 《可再生能源》 北大核心 2025年第4期552-560,共9页
文章针对锂离子电池在风电场储能系统中的放电性能和容量变化进行了研究。通过设计合理的实验方案,采用先进的测试技术,系统地探讨了锂离子电池在不同放电倍率下的性能表现及容量和温度变化。在自然散热状态下,电池中心的最高温度为69.8... 文章针对锂离子电池在风电场储能系统中的放电性能和容量变化进行了研究。通过设计合理的实验方案,采用先进的测试技术,系统地探讨了锂离子电池在不同放电倍率下的性能表现及容量和温度变化。在自然散热状态下,电池中心的最高温度为69.87℃,加入液冷散热方式后,电池中心的最高温度为63.25℃,温度下降了9.475%,所需散热时间从45 min减少到25 min,相应地,温度从48.87℃降低到35.00℃。与自然散热相比,液冷散热在高倍率放电过程中具有显著的效果,不仅降低了温升而且缩短了降低温度所需要的时间。研究结果表明,高倍率放电下,锂离子电池在风电场储能系统应用中表现出良好的放电性能,但随着倍率增大放出容量会有一定程度的减少。文章研究结果不仅为锂离子电池在风电场储能系统中的应用提供了理论支持,也为优化其使用和散热技术提供了实践指导。 展开更多
关键词 钛酸锂电池 高倍率放电 风电场储能系统 环境温度 容量变化
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钛酸钙镁微波介质陶瓷的低温烧结及介电性能
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作者 林玮 刘政 +1 位作者 王一巍 匡健磊 《材料工程》 北大核心 2025年第5期145-151,共7页
采用TiO_(2)、CaCO_(3)、Mg(OH)_(2)为原料,通过高温固相法合成了钛酸钙镁(0.95MgTiO_(3)-0.05CaTiO_(3))粉体,并基于相图设计制备了Li_(2)B_(4)O_(7)-Al_(2)O_(3)低熔点烧结助剂,在此基础上实现钛酸钙镁微波介质陶瓷的低温烧结制备。... 采用TiO_(2)、CaCO_(3)、Mg(OH)_(2)为原料,通过高温固相法合成了钛酸钙镁(0.95MgTiO_(3)-0.05CaTiO_(3))粉体,并基于相图设计制备了Li_(2)B_(4)O_(7)-Al_(2)O_(3)低熔点烧结助剂,在此基础上实现钛酸钙镁微波介质陶瓷的低温烧结制备。研究了合成温度(900~1100℃)对钛酸钙镁粉体物相组成的影响,以及烧结温度(1175~1250℃)、烧结助剂添加量(1%~5%,质量分数,下同)对钛酸钙镁陶瓷密度、微观结构、介电常数、品质因数和频率温度系数等的影响规律。结果表明,当反应温度为1100℃时,可制备高纯度的0.95MgTiO_(3)-0.05CaTiO_(3)陶瓷粉体;烧结助剂的引入有效降低陶瓷的烧结温度,但过高(5%)的添加量反而导致密度和介电性能下降;当助剂添加比例为3%且烧结温度为1225℃时,可获得相对密度为98.70%,介电常数为20.38,品质因数为37240 GHz和频率温度系数为-9.6×10^(-6)℃^(-1)的钛酸钙镁陶瓷材料。 展开更多
关键词 钛酸钙镁 微波介质陶瓷 低温烧结 介电性能 频率温度系数
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