过渡金属硒化物超级电容器高性能电极材料的研究进展

Research progress on electrode materials with high-performance in the supercapacitors of transition metal selenide

过渡金属硒化物具有较高的电导率,并且硒具有低电负性使较弱的金属-硒键更有利于氧化还原反应的发生,是潜在的超级电容器高性能电极材料。本文首先介绍了目前过渡金属硒化物主要的制备方法,然后阐述了提升其电化学性能的优化策略。一方面对制备方法进行优化,通过调控反应物时间、反应温度、电解液组成等因素,调控电极材料的形貌和结构,来提高离子传输效率;另一方面通过(1)二元过渡金属成分的调配,(2)与碳基材料进行复合,以及(3)结构的调控制备高性能电极材料,以提高其电化学性能。最后对其发展前景和重点发展方向进行了展望。

Transition metal selenides have high electrical conductivity,and the low electronegativity of selenium makes the weaker metal-selenium bond,which is more favourable for the occurrence of redox reactions.Transition metal selenides thus are potential electrode materials with high-performance in supercapacitors.In this work,it was firstly introduced that the main preparation methods of transition metal selenides were utilized at present.Next,the optimization strategies to improve their electrochemical performance were elaborated.On the one hand,the preparation methods were optimized,and the morphology and structure of the electrode material were adjusted by changing some factors such as reactant time,reaction temperature,electrolyte composition,and so on,improving the efficiency of ion transport.On the other hand,high-performance electrode materials were fabricated by(1)the preparation of binary transition metal components,(2)compounding with carbon-based materials,and(3)controlling structure to improve their electrochemical performance.Finally,its prospect and the key direction of development were described.