3D Porous VOx/N-Doped Carbon Nanosheet Hybrids Derived from Cross-Linked Dicyandiamide-Chitosan Hydrogels for Superior Supercapacitor Electrode Materials

Jinghua Liu; Xiong He; Jiayang Cai; Jie Zhou; Baosheng Liu; Shaohui Zhang; Zijun Sun; Pingping Su; Dezhi Qu; Yudong Li

doi:10.3390/polym15173565

3D Porous VO_x/N-Doped Carbon Nanosheet Hybrids Derived from Cross-Linked Dicyandiamide-Chitosan Hydrogels for Superior Supercapacitor Electrode Materials

Polymers (Basel). 2023 Aug 28;15(17):3565. doi: 10.3390/polym15173565.

Authors

Jinghua Liu¹, Xiong He¹, Jiayang Cai², Jie Zhou¹, Baosheng Liu¹, Shaohui Zhang¹, Zijun Sun¹, Pingping Su², Dezhi Qu², Yudong Li³

Affiliations

¹ Liuzhou Key Laboratory of New Energy Vehicle Power Lithium Battery, Guangxi Engineering Research Center for Characteristic Metallic Powder Materials, School of Electronic Engineering, Guangxi University of Science and Technology, Liuzhou 545000, China.
² Guangxi Key Laboratory of Green Processing of Sugar Resources, College of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China.
³ Key Laboratory of Bio-Based Material Science & Technology, Northeast Forestry University, Harbin 150090, China.

Abstract

Three-dimensional porous carbon materials with moderate heteroatom-doping have been extensively investigated as promising electrode materials for energy storage. In this study, we fabricated a 3D cross-linked chitosan-dicyandiamide-VOSO₄ hydrogel using a polymerization process. After pyrolysis at high temperature, 3D porous VO_x/N-doped carbon nanosheet hybrids (3D VNCN) were obtained. The unique 3D porous skeleton, abundant doping elements, and presence of VO_x 3D VNCN pyrolyzed at 800 °C (3D VNCN-800) ensured excellent electrochemical performance. The 3D VNCN-800 electrode exhibits a maximum specific capacitance of 408.1 F·g^-1 at 1 A·g^-1 current density and an admirable cycling stability with 96.8% capacitance retention after 5000 cycles. Moreover, an assembled symmetrical supercapacitor based on the 3D VNCN-800 electrode delivers a maximum energy density of 15.6 Wh·Kg^-1 at a power density of 600 W·Kg^-1. Our study demonstrates a potential guideline for the fabrication of porous carbon materials with 3D structure and abundant heteroatom-doping.

Keywords: 3D structure; heteroatom-doping; porous carbon; supercapacitor.

Abstract

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