Unique CoWO4@WO3 heterostructured nanosheets with superior electrochemical performances for all-solid-state supercapacitors. Issue 32 (28th July 2022)

• Record Type: Journal Article
• Authors: Xu, Juan; Guo, Haibin; Li, Zhongyang; Huo, Kaifu; Ma, Guoqiang
• Is Part Of: Dalton transactions. Volume 51:Issue 32(2022)
• Page Start: 12299
• Page End: 12306
• Publication Date: 2022-07-28
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d2dt01827f
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : High performance asymmetric supercapacitors assembled with heterostructured core-shell CoWO4 @WO3 -1 cathodes and Ov -NiMoO4 anodes, showing a maximum area energy density of 13.93 mW h cm −2 and keeping 98.1% capacity retention over 20 000 cycles. Abstract : Transition metal oxide-based battery-type electrode materials with well-defined nanostructure have shown great potential in supercapacitors, due to their high electrical conductivity and superior redox activity. Herein, promising CoWO4 @WO3 -1 heterostructured nanosheets with rich oxygen vacancies are designed via a two-step in situ construction process and following thermal treatment. The CoWO4 @WO3 -1 heterostructured nanosheet arrays grown on a flexible carbon cloth substrate can provide an effective nanoporous framework, facilitate electrons/ions transport, and generate effective synergistic effect of high conductivity from WO3 and superior redox activity from CoWO4 . As a result, the as-prepared CoWO4 @WO3 -1 electrodes exhibit a high area specific capacity of 578.6 mF cm −2 at a current density of 0.5 mA cm −2 and keep 98.38% capacity retention at 20 mA cm −2 over 30 000 cycles. Additionally, all-solid-state supercapacitors assembled with CoWO4 @WO3 -1 as cathodes and Ov -NiMoO4 as anodes show a maximum area energy density of 13.93 mW h cm −2 and power density of 6502.11 mW cm −2, keeping outstanding cycling stability of 98.1% capacity retention over 20 000 cycles.