Solid oxide electrolysis cells(SOECs)can effectively convert CO_(2)into high value-added CO fuel.In this paper,Sc-doped Sr_(2)Fe_(1.5)Mo_(0.3)Sc_(0.2)O_(6−δ)(SFMSc)perovskite oxide material is synthesized via solid-p...Solid oxide electrolysis cells(SOECs)can effectively convert CO_(2)into high value-added CO fuel.In this paper,Sc-doped Sr_(2)Fe_(1.5)Mo_(0.3)Sc_(0.2)O_(6−δ)(SFMSc)perovskite oxide material is synthesized via solid-phase method as the cathode for CO_(2)electrolysis by SOECs.XRD confirms that SFMSc exhibits a stable cubic phase crystal structure.The experimental results of TPD,TG,EPR,CO_(2)-TPD further demonstrate that Sc-doping increases the concentration of oxygen vacancy in the material and the chemical adsorption capacity of CO_(2)molecules.Electrochemical tests reveal that SFMSc single cell achieves a current density of 2.26 A/cm^(2) and a lower polarization impedance of 0.32Ω·cm^(2) at 800°C under the applied voltage of 1.8 V.And no significant performance attenuation or carbon deposition is observed after 80 h continuous long-term stability test.This study provides a favorable support for the development of SOEC cathode materials with good electro-catalytic performance and stability.展开更多
A series .of LaMnyCo1-yO3 compounds were prepared by the complexation method with citric acid. XPS was used to investigate the oxygen state in perovskite-type (ABO3) Complex okide LaMn.Co1-yO3 catalysts. The result sh...A series .of LaMnyCo1-yO3 compounds were prepared by the complexation method with citric acid. XPS was used to investigate the oxygen state in perovskite-type (ABO3) Complex okide LaMn.Co1-yO3 catalysts. The result showed that three oxygen species (α，β，β’) are present in the okides, and that the a-species is the active oxygen species in catalytical okidation.展开更多
采用(NH_4)_2CO_3溶液、KF溶液及TiO_2和CeO_2氧化物等对CaO催化剂进行改性,考察了制备条件对催化剂性能的影响,优化了二甘醇(DEG)、丙烯醇(AAH)和碳酸二甲酯(DMC)酯交换合成二甘醇双烯丙基碳酸酯(ADC)的反应条件,并考察了催化剂的重复...采用(NH_4)_2CO_3溶液、KF溶液及TiO_2和CeO_2氧化物等对CaO催化剂进行改性,考察了制备条件对催化剂性能的影响,优化了二甘醇(DEG)、丙烯醇(AAH)和碳酸二甲酯(DMC)酯交换合成二甘醇双烯丙基碳酸酯(ADC)的反应条件,并考察了催化剂的重复使用性能。采用XRD等方法对CaO-TiO_2催化剂进行表征。实验结果表明,采用机械研磨-焙烧法,以Ca CO3和TiO_2为前体,n(Ca)∶n(Ti)=1,在马弗炉中于空气气氛中900℃下焙烧4 h制备的CaO-TiO_2催化剂对ADC合成反应催化活性最高;酯交换法合成ADC的适宜反应条件为:n(DEG)∶n(DMC)∶n(AAH)=0.08∶1∶2、催化剂含量1.5%(w)、反应温度100℃、反应时间6 h,在此条件下ADC收率最高可达93.6%。表征结果显示,CaO-TiO_2催化剂具有较好的活性和稳定性,Ca Ti O3是CaO-TiO_2催化剂的主活性组分;重复使用5次后,ADC的收率为86.1%。结合表征结果可知,Ca Ti O3是CaO-TiO_2催化剂的主活性组分,CaO的流失是导致催化剂活性略有下降的原因。展开更多
Recent advances in the preparation and application of perovskite-type oxides as bifunctional electrocatalysts for oxygen reaction and oxygen evolution reaction in rechargeable metal-air batteries are presented in this...Recent advances in the preparation and application of perovskite-type oxides as bifunctional electrocatalysts for oxygen reaction and oxygen evolution reaction in rechargeable metal-air batteries are presented in this review.Various fabrication methods of these oxides are introduced in detail,and their advantages and disadvantages are analyzed.Different preparation methods adopted have great influence on the morphologies and physicochemical properties of perovskite-type oxides.As a bifunctional electrocatalyst,perovskite-type oxides are widely used in rechargeable metal-air batteries.The relationship between the preparation methods and the performances of oxygen/air electrodes are summarized.This work is concentrated on the structural stability,the phase compositions,and catalytic performance of perovskite-type oxides in oxygen/air electrodes.The main problems existing in the practical application of perovskite-type oxides as bifunctional electrocatalysts are pointed out and possible research directions in the future are recommended.展开更多
基金supported by National Key R&D Program of China(2021YFB4001401)National Natural Science Foundation of China(52272190,22178023).
文摘Solid oxide electrolysis cells(SOECs)can effectively convert CO_(2)into high value-added CO fuel.In this paper,Sc-doped Sr_(2)Fe_(1.5)Mo_(0.3)Sc_(0.2)O_(6−δ)(SFMSc)perovskite oxide material is synthesized via solid-phase method as the cathode for CO_(2)electrolysis by SOECs.XRD confirms that SFMSc exhibits a stable cubic phase crystal structure.The experimental results of TPD,TG,EPR,CO_(2)-TPD further demonstrate that Sc-doping increases the concentration of oxygen vacancy in the material and the chemical adsorption capacity of CO_(2)molecules.Electrochemical tests reveal that SFMSc single cell achieves a current density of 2.26 A/cm^(2) and a lower polarization impedance of 0.32Ω·cm^(2) at 800°C under the applied voltage of 1.8 V.And no significant performance attenuation or carbon deposition is observed after 80 h continuous long-term stability test.This study provides a favorable support for the development of SOEC cathode materials with good electro-catalytic performance and stability.
文摘A series .of LaMnyCo1-yO3 compounds were prepared by the complexation method with citric acid. XPS was used to investigate the oxygen state in perovskite-type (ABO3) Complex okide LaMn.Co1-yO3 catalysts. The result showed that three oxygen species (α，β，β’) are present in the okides, and that the a-species is the active oxygen species in catalytical okidation.
文摘采用(NH_4)_2CO_3溶液、KF溶液及TiO_2和CeO_2氧化物等对CaO催化剂进行改性,考察了制备条件对催化剂性能的影响,优化了二甘醇(DEG)、丙烯醇(AAH)和碳酸二甲酯(DMC)酯交换合成二甘醇双烯丙基碳酸酯(ADC)的反应条件,并考察了催化剂的重复使用性能。采用XRD等方法对CaO-TiO_2催化剂进行表征。实验结果表明,采用机械研磨-焙烧法,以Ca CO3和TiO_2为前体,n(Ca)∶n(Ti)=1,在马弗炉中于空气气氛中900℃下焙烧4 h制备的CaO-TiO_2催化剂对ADC合成反应催化活性最高;酯交换法合成ADC的适宜反应条件为:n(DEG)∶n(DMC)∶n(AAH)=0.08∶1∶2、催化剂含量1.5%(w)、反应温度100℃、反应时间6 h,在此条件下ADC收率最高可达93.6%。表征结果显示,CaO-TiO_2催化剂具有较好的活性和稳定性,Ca Ti O3是CaO-TiO_2催化剂的主活性组分;重复使用5次后,ADC的收率为86.1%。结合表征结果可知,Ca Ti O3是CaO-TiO_2催化剂的主活性组分,CaO的流失是导致催化剂活性略有下降的原因。
基金Projects(51504212,21573184,51703061)supported by the National Natural Science Foundation of ChinaProject(2018J01521)supported by the Natural Science Foundation of Fujian Province,ChinaProject(fma2017202)supported by the Open Fund of Fujian Provincial Key Laboratory of Functional Materials and Applications(Xiamen University of Technology),China
文摘Recent advances in the preparation and application of perovskite-type oxides as bifunctional electrocatalysts for oxygen reaction and oxygen evolution reaction in rechargeable metal-air batteries are presented in this review.Various fabrication methods of these oxides are introduced in detail,and their advantages and disadvantages are analyzed.Different preparation methods adopted have great influence on the morphologies and physicochemical properties of perovskite-type oxides.As a bifunctional electrocatalyst,perovskite-type oxides are widely used in rechargeable metal-air batteries.The relationship between the preparation methods and the performances of oxygen/air electrodes are summarized.This work is concentrated on the structural stability,the phase compositions,and catalytic performance of perovskite-type oxides in oxygen/air electrodes.The main problems existing in the practical application of perovskite-type oxides as bifunctional electrocatalysts are pointed out and possible research directions in the future are recommended.
