Defect engineering on BiFeO_(3) through Na and V codoping for aqueous Na-ion capacitors

作     者：Wenyun Wang Chao Yang Shangjing Yu Daotong Han Wentao Qi Rui Ling Guangqiang Liu Wenyun Wang;Chao Yang;Shangjing Yu;Daotong Han;Wentao Qi;Rui Ling;Guangqiang Liu

作者机构：School of Physics and Physical EngineeringQufu Normal UniversityQufu 273165ShandongChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2024年第90卷第3期

页      面：453-463,I0011页

核心收录：

学科分类：0820[工学-石油与天然气工程] 080801[工学-电机与电器] 0808[工学-电气工程] 0817[工学-化学工程与技术] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：financial supports from National Natural Science Foundation of China(22005174 and 52271133) 

主　　题：BiFeO_(3) Na^(+) storage V doping Oxygen vacancy Capacitor 

摘      要：Sodium with low cost and high abundance is considered as a substitute element of lithium for batteries and supercapacitors,which need the appropriate host materials to accommodate the relatively large Na^(+) *** to Li^(+) storage,Na^(+) storage makes higher demands on the structural optimization of perovskite bismuth ferrite(BiFeO_(3)).We propose a novel strategy of defect engineering on BiFeO_(3) through Na and V codoping for high-efficiency Na^(+) storage,to reveal the roles of oxygen vacancies and V ions played in the enhanced electrochemical energy storage performances of Na-ion *** formation of the oxygen vacancies in the Na and V codoped BiFeO_(3)(denoted as NV-BFO),is promoted by Na doping and suppressed by V doping,which can be demonstrated by XPS and EPR *** the first-principles calculations,the oxygen vacancies and V ions in NV-BFO are confirmed to substantially lower the Na^(+)migration energy barriers through the space and electric field effects,to effectively promote the Na^(+) transport in the *** kinetic analysis of the NV-BFO//NV-BFO capacitors indicates the dominant capacitive-controlled capacity,which depends on fast Na^(+) deintercalation-intercalation process in the NV-BFO *** NV-BFO//NV-BFO capacitors open up a new avenue for developing highperformance Na-ion capacitors.