文献类型：期刊文献

英文题名：Defect-domains enabling VO2 nanosheet arrays with fast charge transfer for 3.0 V aqueous supercapacitors

作者：Chen, Shuai[1];Yu, Haifeng[1];Chen, Ling[1];Jiang, Hao[1];Li, Chunzhong[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Engn Res Ctr Hierarch Nanomat, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China

年份：2021

卷号：423

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20211910344862);WOS:【SCI-EXPANDED(收录号:WOS:000683029200002)】；

基金：This work was supported by the National Natural Science Foundation of China (21838003 and 91834301), the Shanghai Scientific and Technological Innovation Project (18JC1410500), and the Fundamental Research Funds for the Central Universities (222201718002).

语种：英文

外文关键词：defect engineering; vanadium dioxide; energy density; asymmetric supercapacitors

摘要：Defective metal oxides are of great significance to promote reaction activity for high energy and power densities supercapacitors in aqueous electrolytes. Herein, we demonstrate a monoclinic VO2 nanosheet arrays electrode with tailorable defect-domains by a simple thermal-induced strategy. It is found that the defect-domains stemmed from the residual trivalent vanadium of V2O3 precursor directly influence the intrinsic conductivity of VO2. The relationships between defect-domains and electrochemical performance are built and the defect-optimized VO2 can greatly accelerate the electrochemical reaction kinetics with decreased polarization effect. It exhibits a high specific capacitance of 180.3 F g(-1) at 0.5 A g(-1) and 78.8 F g(-1) even at 10 A g(-1) within a large potential window of -1.5 similar to 0.15 V with superior cycle stability in "water in salt" electrolyte. A 3.0 V aqueous asymmetric supercapacitor device is assembled with MnO2 nanosheet arrays as cathode, which delivers a very high energy density of 120.3 Wh kg(-1) at 1.5 kW kg(-1) , almost as good as sodium/potassium ion batteries.