The advancement of planar micro-supercapacitors(PMSCs)for micro-electromechanical systems(MEMS)has been significantly hindered by the challenge of achieving high energy and power densities.This study addresses this is...The advancement of planar micro-supercapacitors(PMSCs)for micro-electromechanical systems(MEMS)has been significantly hindered by the challenge of achieving high energy and power densities.This study addresses this issue by leveraging screen-printing technology to fabricate high-performance PMSCs using innovative composite ink.The ink,a synergistic blend of few-layer graphene(Gt),carbon black(CB),and NiCo_(2)O_(4),was meticulously mixed to form a conductive and robust coating that enhanced the capacitive performance of the PMSCs.The optimized ink formulation and printing process result in a micro-supercapacitor with an exceptional areal capacitance of 18.95 mF/cm^(2)and an areal energy density of 2.63μW·h/cm^(2)at a current density of 0.05 mA/cm^(2),along with an areal power density of 0.025 mW/cm^(2).The devices demonstrated impressive durability with a capacitance retention rate of 94.7%after a stringent 20000-cycle test,demonstrating their potential for long-term applications.Moreover,the PMSCs displayed excellent mechanical flexibility,with a capacitance decrease of only 3.43%after 5000 bending cycles,highlighting their suitability for flexible electronic devices.The ease of integrating these PMSCs into series and parallel configurations for customized power further underscores their practicality for integrated power supply solutions in various technologies.展开更多
Graphite and graphite-like materials widely are present at black shale and magmatic ores. The nature of these carbon materials (CM) is multifarious. In what cause connects a mineralization with carbon. The great numbe...Graphite and graphite-like materials widely are present at black shale and magmatic ores. The nature of these carbon materials (CM) is multifarious. In what cause connects a mineralization with carbon. The great numbers of parameters, namely, the temperature, the pressure, the shear stress, the catalytic species, the host-rock lithology, the time and etc., have an influence on the graphitization process. Accumulations of gold and platinum group elements in black graphite shale and extraction of these metals from rocks depend in considerable degree from structural properties of CM. Raman spectroscopy has wide applied for various carbon modifications, including nano-structuring materials. The first and second-order Raman spectrum have been correlated with changes in the structure of graphite. There is a linear relationship between temperature and Raman R2 and R1 parameters (derived from the area and intensity of the defect band (D) relative to the ordered graphite band (G), respectively). The purpose of the present study is to characterize the rocks and CM from carbon-rich rocks of gold-ore deposits of the black-shale formation and magmatic ores using micro-Raman spectroscopy technique (Horiba Jobin Ivon LabRam spectrometer). Exciting was performed with 325 nm line of He-Cd laser. The graphite and graphite-like samples from many ore deposits of Russia and Kazahstan are investigations. R1 and R2 ratio indicate variable degree of organisation CM in the samples. The results show different spectral variations of CM with metamorphic grade: the well-ordered graphite from magmatic rocks, more - ordered and the disordered less graphitized CM from black-shale ores. For the first time in the world practice the Raman spectroscopy technique has been applied to determine the temperature of graphitizing for CM at gold-ore deposits of the black-shale formation. The temperatures obtained on carboniferous substance for the gold deposits range from 405°С to 280°С. Temperature of CM formation from Pt-low sulphide ores of the Talnakh deposit ranges from 4700C to 6500C. It has been shown that the carbon-rich phases from black-shale and magmatic rocks have various degrees of graphitization and different carbon forms.展开更多
采用板状刚玉（3．0～1．0、1．0～0．5、0．6～0．2、≤0．3、≤0．045和≤0．02 mm ）、活性氧化铝微粉（≤2μm）、单质硅（≤0．045 mm）为主要原料，引入纳米炭黑（N220型）或天然鳞片石墨（≤0．074 mm）为碳源，在埋焦炭条件下经...采用板状刚玉（3．0～1．0、1．0～0．5、0．6～0．2、≤0．3、≤0．045和≤0．02 mm ）、活性氧化铝微粉（≤2μm）、单质硅（≤0．045 mm）为主要原料，引入纳米炭黑（N220型）或天然鳞片石墨（≤0．074 mm）为碳源，在埋焦炭条件下经800、1000、1200和1400℃处理制备了低碳 Al2O3－C耐火材料。对比研究了炭黑和鳞片石墨不同加入量对试样的力学性能和抗热震性的影响。采用三点弯曲法研究两种碳源对材料力学性能的影响，采取水淬冷法研究材料的抗热震性，利用X射线衍射仪检测材料的物相组成变化，通过场发射扫描电子显微镜观察材料的显微结构。结果表明：1）当铝碳材料处理温度低于1000℃时，碳源种类对其强度影响不明显；当处理温度高于1200℃时，由于更多碳化硅晶须的生成，添加石墨试样的强度远高于添加纳米炭黑的铝碳材料。2）纳米炭黑粒径小，易填充于氧化铝颗粒间隙并形成纳米碳网络，有利于吸收和平衡热膨胀和收缩过程中产生的热应力，降低材料的热膨胀系数，其热震后强度保持率高于含石墨的铝碳材料。3）通过纳米炭黑与微米鳞片石墨的有效复合可以制备出强度高，抗热震性好的低碳铝碳耐火材料。展开更多
基金supported by the Shanxi Province Central Guidance Fund for Local Science and Technology Development Project(YDZJSX2024D030)the National Natural Science Foundation of China(22075197,22278290)+2 种基金the Shanxi Province Key Research and Development Program Project(2021020660301013)the Shanxi Provincial Natural Science Foundation of China(202103021224079)the Research and Development Project of Key Core and Common Technology of Shanxi Province(20201102018).
文摘The advancement of planar micro-supercapacitors(PMSCs)for micro-electromechanical systems(MEMS)has been significantly hindered by the challenge of achieving high energy and power densities.This study addresses this issue by leveraging screen-printing technology to fabricate high-performance PMSCs using innovative composite ink.The ink,a synergistic blend of few-layer graphene(Gt),carbon black(CB),and NiCo_(2)O_(4),was meticulously mixed to form a conductive and robust coating that enhanced the capacitive performance of the PMSCs.The optimized ink formulation and printing process result in a micro-supercapacitor with an exceptional areal capacitance of 18.95 mF/cm^(2)and an areal energy density of 2.63μW·h/cm^(2)at a current density of 0.05 mA/cm^(2),along with an areal power density of 0.025 mW/cm^(2).The devices demonstrated impressive durability with a capacitance retention rate of 94.7%after a stringent 20000-cycle test,demonstrating their potential for long-term applications.Moreover,the PMSCs displayed excellent mechanical flexibility,with a capacitance decrease of only 3.43%after 5000 bending cycles,highlighting their suitability for flexible electronic devices.The ease of integrating these PMSCs into series and parallel configurations for customized power further underscores their practicality for integrated power supply solutions in various technologies.
文摘Graphite and graphite-like materials widely are present at black shale and magmatic ores. The nature of these carbon materials (CM) is multifarious. In what cause connects a mineralization with carbon. The great numbers of parameters, namely, the temperature, the pressure, the shear stress, the catalytic species, the host-rock lithology, the time and etc., have an influence on the graphitization process. Accumulations of gold and platinum group elements in black graphite shale and extraction of these metals from rocks depend in considerable degree from structural properties of CM. Raman spectroscopy has wide applied for various carbon modifications, including nano-structuring materials. The first and second-order Raman spectrum have been correlated with changes in the structure of graphite. There is a linear relationship between temperature and Raman R2 and R1 parameters (derived from the area and intensity of the defect band (D) relative to the ordered graphite band (G), respectively). The purpose of the present study is to characterize the rocks and CM from carbon-rich rocks of gold-ore deposits of the black-shale formation and magmatic ores using micro-Raman spectroscopy technique (Horiba Jobin Ivon LabRam spectrometer). Exciting was performed with 325 nm line of He-Cd laser. The graphite and graphite-like samples from many ore deposits of Russia and Kazahstan are investigations. R1 and R2 ratio indicate variable degree of organisation CM in the samples. The results show different spectral variations of CM with metamorphic grade: the well-ordered graphite from magmatic rocks, more - ordered and the disordered less graphitized CM from black-shale ores. For the first time in the world practice the Raman spectroscopy technique has been applied to determine the temperature of graphitizing for CM at gold-ore deposits of the black-shale formation. The temperatures obtained on carboniferous substance for the gold deposits range from 405°С to 280°С. Temperature of CM formation from Pt-low sulphide ores of the Talnakh deposit ranges from 4700C to 6500C. It has been shown that the carbon-rich phases from black-shale and magmatic rocks have various degrees of graphitization and different carbon forms.
