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Design and Synthesis of Zinc‐Activated Co x Ni 2− x P/Graphene Anode for High‐Performance Zinc Ion Storage Device
Author(s) -
Guo Dongfang,
Li Zijiong,
Wang Dianzhang,
Sun Min,
Wang Haiyan
Publication year - 2021
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202100285
Subject(s) - anode , materials science , cathode , supercapacitor , graphene , electrochemistry , energy storage , zinc , capacitance , capacitor , chemical engineering , galvanic anode , oxide , carbon fibers , electrode , nanotechnology , composite number , metallurgy , chemistry , composite material , electrical engineering , voltage , cathodic protection , physics , power (physics) , engineering , quantum mechanics
Zinc ion capacitors (ZICs) composed of capacitor‐type cathodes and battery‐type anodes have attracted widespread attention thanks to the huge potential in the next generation of low‐cost energy‐storage devices. It is a challenge to explore a universal anode for aqueous ZICs with high‐efficiency energy‐storage characteristics. In this work, the double‐transition‐metal composite Co x Ni 2− x P/reduced graphene oxide (rGO) with sufficient electrochemical activity and charge‐transfer kinetics was successfully synthesized. The Zn@CoNiP/rGO anode obtained by zinc‐ion activation and a biomass‐derived porous carbon cathode (PC) were assembled into an aqueous ZIC (CNP–ZIC) in 2 m ZnSO 4 . Finally, the CNP–ZIC reveals excellent energy and power densities with a working potential range of 0.2–1.9 V. CNP–ZICs shows high capacitance of up to 356.6 F g −1 at 0.5 A g −1 (based on the mass of active material on the PC cathode), which is far superior to the performance of conventional asymmetric energy storage devices (CoNiP/rGO//PC and Co 2 P/rGO//PC). The CNP–ZIC exhibits both a very high energy density of 143.14 Wh kg −1 and good cycling life (∼92.2 % retention after 10000 charge–discharge cycles at 7.5 A g −1 ). There is no doubt that this work provides a promising strategy for assembling novel zinc ion hybrid supercapacitors with high efficiency and stable output.