Ultrasimple air-annealed pure graphene oxide film for high-performance supercapacitors

Zi-Wen Xu; Jian Wang; Lei Dong; Guanghui Xie; Yuxing He; Naxing Liu; Fu-Gang Zhao; Wen-Jing Xiao; Li-Na Liu; Yuanyuan Li; Junjing Bai; Jingjing Li; Wei-Shi Li

doi:10.1016/j.jcis.2022.04.180

Ultrasimple air-annealed pure graphene oxide film for high-performance supercapacitors

J Colloid Interface Sci. 2022 Sep 15:622:960-970. doi: 10.1016/j.jcis.2022.04.180. Epub 2022 May 6.

Authors

Zi-Wen Xu¹, Jian Wang², Lei Dong³, Guanghui Xie⁴, Yuxing He², Naxing Liu², Fu-Gang Zhao², Wen-Jing Xiao⁵, Li-Na Liu⁵, Yuanyuan Li⁴, Junjing Bai⁴, Jingjing Li⁴, Wei-Shi Li⁶

Affiliations

¹ Key Laboratory of Synthetic and Self-assembly Chemistry for Organic Functional Molecules, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China; Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Department of Chemistry, Zhejiang Sci-Tech University, 928 Second Street, Hangzhou 310018, China.
² Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Department of Chemistry, Zhejiang Sci-Tech University, 928 Second Street, Hangzhou 310018, China.
³ School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China; State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China.
⁴ Engineering Research Center of Zhengzhou for High Performance Organic Functional Materials, Zhengzhou Institute of Technology, 6 Yingcai Street, Huiji District, Zhengzhou 450044, China.
⁵ Key Laboratory of Synthetic and Self-assembly Chemistry for Organic Functional Molecules, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China.
⁶ Key Laboratory of Synthetic and Self-assembly Chemistry for Organic Functional Molecules, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China; Engineering Research Center of Zhengzhou for High Performance Organic Functional Materials, Zhengzhou Institute of Technology, 6 Yingcai Street, Huiji District, Zhengzhou 450044, China. Electronic address: liws@mail.sioc.ac.cn.

PMID: 35561614
DOI: 10.1016/j.jcis.2022.04.180

Abstract

Realizing both high gravimetric and volumetric specific capacitances (noted as C_W and C_V, respectively) is an essential prerequisite for the next-generation, high performance supercapacitors. However, the need of electronic/ionic transport for electrochemical reactions causes a "trade-off" between compacted density and capacitance of electrode, thereby impairing gravimetric or volumetric specific capacitances. Herein, we report a high-performance, film-based supercapacitor via a thermal reduction of graphene oxide (GO) in air. The reduced, layer-structured graphene film ensures high electrode density and high electron conductivity, while the hierarchical channels generated from reduction-induced gas releasing process offer sufficient ion transport pathways. Note that the resultant graphene film is employed directly as electrodes without using any additives (binders and conductive agents). As expected, the as-prepared electrodes perform particularly well in both C_W (420F g^-1) and C_V (360F cm^-3) at a current density of 0.5 A g^-1. Even at an ultrahigh current density of 50 A g^-1, C_W and C_V maintain in 220F g^-1 and 189F cm^-3, respectively. Furthermore, the corresponding symmetric two-electrode supercapacitor achieves both high gravimetric energy density of 54 W h kg^-1 and high gravimetric power density of 1080 W kg^-1, corresponding to volumetric energy density of 46 W h L^-1 and volumetric power density of 917 W L^-1.

Keywords: Energy storage; Graphene; Graphene oxide; Supercapacitors; Thermal treatment.