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Facile Synthesis of CoWO 4 Nanosheet Arrays Grown on Nickel Foam Substrates for Asymmetric Supercapacitors
Author(s) -
Chen Sanming,
Yang Guang,
Jia Yi,
Zheng Huajun
Publication year - 2016
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201600316
Subject(s) - nanosheet , supercapacitor , materials science , electrode , nickel , capacitance , power density , hydrothermal circulation , nanotechnology , chemical engineering , carbon fibers , hydrothermal synthesis , composite material , metallurgy , chemistry , composite number , power (physics) , physics , quantum mechanics , engineering
Well‐aligned CoWO 4 nanosheet arrays grown on nickel foam substrates have been fabricated by using a facile hydrothermal process. The interconnected CoWO 4 nanosheets with abundant open spaces are uniformly deposited on the skeleton of the nickel foam. When investigated as binder‐free electrodes for supercapacitors, the CoWO 4 nanosheet arrays exhibit a specific capacitance of 1127.6 F g −1 at 1 A g −1 and remarkable cycle performance. Moreover, an asymmetric supercapacitor (ASC) is assembled by using CoWO 4 nanosheets and activated carbon as the positive electrode and negative electrode, respectively. The ASC device delivers a maximum energy density of 48 Wh kg −1 at a power density of 365 W kg −1 . The results demonstrate that CoWO 4 nanosheet arrays could be potential electrode materials for energy‐storage systems.