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Methylene blue intercalated vanadium oxide with synergistic energy storage mechanism for highly efficient aqueous zinc ion batteries

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Journal of energy Chemistry 2023年第2期77卷 269-279,I0007页

作者： Yunxiao Tong Ying Zang Senda Su Yinggui Zhang Junzhuo Fang Yongqing Yang Xiaoman Li Xiang Wu Fuming Chen Jianhua Hou Min Luo State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering School of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021NingxiaChina School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870LiaoningChina Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials School of Physics and Telecommunication EngineeringSouth China Normal UniversityGuangzhou 510006GuangdongChina College of Environment Science and Engineering Yangzhou UniversityYangzhou 225009JiangsuChina

With the rise of aqueous multivalent rechargeable batteries,inorganic-organic hybrid cathodes have attracted more and more attention due to the complement of each other’s ***,a strategy of designing hybrid cathode is adopted for high efficient aqueous zinc-ion batteries(AZIBs).Methylene blue(MB)intercalated vanadium oxide(HVO-MB)was synthesized through sol-gel and ion exchange *** with other organic-inorganic intercalation cathode,not only can the MB intercalation enlarge the HVO interlayer spacing to improve ion mobility,but also provide coordination reactions with the Zn^(2+)to enhance the intrinsic electrochemical reaction kinetics of the hybrid *** a key component for the cathode of AZIBs,HVO-MB contributes a specific capacity of 418 mA h g^(-1) at 0.1 A g^(-1),high rate capability(243 mA h g^(-1) at 5 A g^(-1))and extraordinary stability(88%of capacity retention after 2000cycles at a high current density of 5 A g^(-1))in 3 M Zn(CF_(3)SO_(3))_(2) aqueous *** electrochemical kinetics reveals HVO-MB characterized with large pseudocapacitance charge storage behavior due to the fast ion migration provided by the coordination reaction and expanded interlayer ***,a mixed energy storage mechanism involving Zn^(2+)insertion and coordination reaction is confirmed by various ex-situ ***,this work opens up a new path for constructing the high performance cathode of AZIBs through organic-inorganic hybridization.

关键词： synergistic energy storage mechanism Aqueous zinc-ion batteries Vanadium oxides Pre-intercalation strategy Methylene blue

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