Molten salt synthesis and supercapacitor properties of oxygen-vacancy LaMnO3-δ  

作　　者：Ya-Li Song Zi-Chang Wang Yong-De Yan Mi-Lin Zhang Gui-Ling Wang Tai-Qi Yin Yun Xue Fan Gao Min Qiu 

机构地区：[1]Key Laboratory of Superlight Materials and Surface Technology,Ministry of Education,College of Materials Science and Chemical Engineering,HarbinEngineering University,Harbin 150001,Heilongjiang,China [2]College of Science,Heihe University,Heihe 164300,Heilongjiang,China

出　　处：《Journal of Energy Chemistry》2020年第4期173-181,共9页能源化学（英文版）

基　　金：financially supported by the China Scholarship Council,the National Natural Science Foundation of China(21976047,21790373 and 51774104);the Fundamental Research funds for the Central Universities(3072019CF1005);the Scientific Research and Special Foundation Heilongjiang Postdoctoral Science Foundation(LBH-Q15019,LBH-Q15020 and LBH-TZ0411);Ph.D.Student Research and Innovation Fund of the Fundamental Research Funds for the Central Universities(3072019GIP1011)。

摘　　要：Due to the unique structure of perovskite materials,their capacitance can be improved by introducing oxygen vacancy.In this paper,the LaMnO3-δ material containing oxygen vacancy was synthesized by molten salt method in KNO3-NaNO3-NaNO2 melt.The La-Mn-O crystal grows gradually in molten salt with the increase of temperature.It was confirmed that LaMnO3-δ with perovskite structure and incomplete oxygen content were synthesized by molten salt method and presented a three-dimensional shape.LaMnO3-δ stores energy by redox reaction and adsorption of OH-in electrolyte simultaneously.In comparison with the stoichiometric LaMnO3 prepared by the sol-gel method,LaMnO3-δ prepared by molten salt method proffered higher capacitance and better performance.The galvanostatic charge-discharge curve showed specific capacitance of 973.5 F/g under current density of 1 A/g in 6 M KOH.The capacitance of LaMn03-δ was 82.7%under condition of 5 A/g compared with the capacitance at the current of 1A/g,and the specific capacitances of 648.0 and 310.0 F/g were obtained after 2000 and 5000 cycles of galvanostatic charging-discharging,respectively.Molten salt synthesis method is relatively simple and suitable for industrial scale,presenting a promising prospect in the synthesis of perovskite oxide materials.Due to the unique structure of perovskite materials,their capacitance can be improved by introducing oxygen vacancy.In this paper,the LaMnO3-δ material containing oxygen vacancy was synthesized by molten salt method in KNO3-NaNO3-NaNO2 melt.The La-Mn-O crystal grows gradually in molten salt with the increase of temperature.It was confirmed that LaMnO3-δ with perovskite structure and incomplete oxygen content were synthesized by molten salt method and presented a three-dimensional shape.LaMnO3-δ stores energy by redox reaction and adsorption of OH-in electrolyte simultaneously.In comparison with the stoichiometric LaMnO3 prepared by the sol-gel method,LaMnO3-δ prepared by molten salt method proffered higher capacitance and better performance.The galvanostatic charge-discharge curve showed specific capacitance of 973.5 F/g under current density of 1 A/g in 6 M KOH.The capacitance of LaMn03-δ was 82.7%under condition of 5 A/g compared with the capacitance at the current of 1A/g,and the specific capacitances of 648.0 and 310.0 F/g were obtained after 2000 and 5000 cycles of galvanostatic charging-discharging,respectively.Molten salt synthesis method is relatively simple and suitable for industrial scale,presenting a promising prospect in the synthesis of perovskite oxide materials.

关 键 词：LaMnO3-δ Perovskite oxide KNO3-NaNO3-NaNO2 MELT SUPERCAPACITOR MOLTEN salt synthesis 

分 类 号：TM53[电气工程—电器] O614.331[理学—无机化学]