| Autor: |
Guo, Dongfang, Li, Zijiong, Wang, Dianzhang, Sun, Min, Wang, Haiyan |
| Předmět: |
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| Zdroj: |
ChemSusChem; 5/20/2021, Vol. 14 Issue 10, p2205-2215, 11p |
| Abstrakt: |
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 CoxNi2−xP/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 ZnSO4. 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 Co2P/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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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