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Origin of superior pseudocapacitive mechanism of transition metal nitrides

Journal of Energy Chemistry 2022年第6期31卷 561-568,I0016页

作者： Chao Huang Ping Qin Dan Li Qingdong Ruan Hao Song Liangliang Liu Yuzheng Wu Yinghe Ma Qingwei Li Kaifu Huo Paul K.Chu Department of Physics Department of Materials Science and Engineeringand Department of Biomedical EngineeringCity University of Hong KongHong Kong 999077China Department of Physics Hong Kong Baptist University(HKBU)Kowloon TongHong Kong 999077China The State Key Laboratory of Refractories and metallurgy Institute of Advanced Materials and NanotechnologyWuhan University of Science and TechnologyWuhan 430081HubeiChina Wuhan National Laboratory for Optoelectronics(WNLO) School of Optical and Electronic InformationHuazhong University of Science and TechnologyWuhan 430074HubeiChina Advanced Research Institute for Multidisciplinary Science Qilu University of Technology(Shandong Academy of Sciences)Jinan 250307ShandongChina

Large-scale deployment of Internet of Things (IoT),a revolutionary innovation for a better world,is hampered by the limitation of energy *** transition metal nitride (TMN)-based micro-supercapacitors is a possible solution by taking advantage of the high conductivity,large specific capacitance,and large tap density of the ***,the pseudocapacitive storage mechanism of TMNs is still unclear consequently impeding the design of ***,the functions and mechanism of TMNs with different metal oxynitride (TMNO_(x)) concentrations in pseudocapacitive electrodes are investigated systematically by in situ Raman scattering,ex situ X-ray photoelectron spectroscopy,as well as ion isolation and substitution cyclic *** is found that the specific capacitances of TMNs depend on the TMNO_(x) concentrations and the N–M–O site is responsible for the large pseudocapacitance via the Faradic reaction between TMNO_(x) and OH^(-).Our study elucidates the mechanism pertaining to pseudocapacitive charge storage of TMNs and provides insights into the design and optimization of TMNO_(x) as well as other electrode materials for pseudocapacitors.

关键词： Internet of Things(IoT) Transition metal nitride(TMN) metal oxynitride Supercapacitors

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