Flexible reduced graphene oxide/V2O5 composite battery-type cathode and MXene capacitor-type anode for aqueous zinc ion hybrid supercapacitors with high energy density

Wang, Yi ¹Guo, Jinghe ¹Zhang, Jianglei ¹Liu, Guangsen ¹Wang, Dong ¹Si, Weimeng ¹Song, Jia ²Meng, Xiuxia ¹Wen, Guangwu ¹Cao, Jun¹

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作者信息

1. Shandong Univ Technol
2. Tianjin Univ
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Abstract

To meet the rapid development of flexible supercapacitors with both high energy density and power density, hybrid ion capacitors like lithium and sodium ion capacitors have attracted more and more at-tention. However, the hidden danger associated with the using of organic electrolytes limit their practical application. In this regard, a new configuration flexible zinc-ion hybrid supercapacitor (ZHSC) based on free-standing films of RGO-V2O5 (RGV) battery-type cathode and RGO-MXene (RGM) capacitor-type anode in aqueous electrolyte has been designed. The RGM/RGV system consists of specific layered structure, short ion diffusion pathway, high electrical conductivity and exceptional structural stability. As a result, the ZHSC based on RGM/RGV exhibits excellent electrochemical performance, including a large specific capacity of 175 F g-1 at 0.5 mV s-1, a maximum energy density up to 107.2 Wh kg-1 (321.6 W kg-1) and a high capa-citance retention of 81% of its initial capacitance (10,000 cycles). Additionally, the ZHSC displays a high specific capacity of 125 F g-1 at 0.5 mV s-1 even in an aqueous gel electrolyte. More importantly, super -capacitors based on the composite films exhibit stable flexibility electrochemical performance. The in-vestigation provides an essential strategy to synthesize composite films for application in high performance flexible hybrid supercapacitors.(c) 2022 Elsevier B.V. All rights reserved.

Key words

Zinc-ion hybrid supercapacitor/Aqueous electrolyte/Free-standing films/Ultrastability/CARBON NANOTUBE/HYDROGEL/SAFE

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出版年

2022

Journal of Alloys and Compounds

EISCI

ISSN：0925-8388

被引量21

参考文献量65

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