Disclosure of charge storage mechanisms in molybdenum oxide nanobelts with enhanced supercapacitive performance induced by oxygen deficiency

作     者：Ping Qin Shi-Qing Zhang Ken-Kin-Lam Yung Zhi-Feng Huang Biao Gao Ping Qin;Shi-Qing Zhang;Ken-Kin-Lam Yung;Zhi-Feng Huang;Biao Gao

作者机构：Department of PhysicsGolden Meditech Centre for NeuroRegeneration SciencesHong Kong Baptist University(HKBU)Kowloon 999077Hong KongChina Institute of Advanced MaterialsState Key Laboratory of Environmental and Biological AnalysisHong Kong Baptist University(HKBU)Kowloon 999077Hong KongChina HKBU Institute of Research and Continuing EducationShenzhen 518000China State Key Laboratory of Refractories and Metallurgy and Institute of Advanced Materials and NanotechnologyWuhan University of Science and TechnologyWuhan 430081China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2021年第40卷第9期

页      面：2447-2454页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 07[理学] 08[工学] 070205[理学-凝聚态物理] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：financially supported by the Hong Kong Baptist University(No.RMGS-2019-1-03A)。 

主　　题：Charge storage mechanisms Oxygen vacancies MoO3 nanobelts Supercapacitance 

摘      要：Molybdenum oxide(MoO_(3)), with superior features of multi-electrochemical states, high theoretical capacitance, and low cost, is a desirable supercapacitor electrode material but suffers from low conductivity and insufficient active sites. The MoO_(3) capacitance can be largely amplified by introducing oxygen(O) vacancies, but the mechanisms at the atomic scale are still ambiguous.Herein, O vacancies are created at the O2 and O3 sites in the MoO_(3) nanobelts by carbonization to maximize the supercapacitance in the MoO_(2.39). The supercapacitive storage is mainly ascribed to the proton adsorption at the O1 sites to create Mo–OH, leading to an expansion of the interlayer spacing along the lattice B-axis. Roughly 98% of the initial supercapacitance is retained after 1000 cycles,due to the reversible change in the interlayer spacing. Our results provide an insight into the oxygen deficiency-related mechanisms of the supercapacitive performance at the atomic scale and devise a facile method to enhance the supercapacitance for energy storage and conversion.