期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 16, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202111131
关键词
3D printed electrode; charge storage mechanism; proton adsorption chemistry; reduce graphene oxide; Zn ion capacitor
类别
资金
- National Natural Science Foundation of China [21875107, U1802256]
- Leading Edge Technology of Jiangsu Province [BK20202008]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX21_0206]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
This study focuses on optimizing the charge storage capability and electrochemical kinetics of reduced graphene oxide (rGO) nanosheets. It reveals the additional contribution of reversible adsorption/desorption of H+ on the carbon atom of rGO sheets. The findings provide insights into proton adsorption chemistry and offer guidance for the design of novel electrode materials.
Recently, developing matchable cathode materials of Zn ion hybrid capacitor still remains difficult owing to insufficient understanding of the charge storage behavior. However, most previous efforts are devoted to explain the effect of oxygen-containing groups without paying attention to graphitic structure. Herein, the charge storage capability and electrochemical kinetics of reduce graphene oxide (rGO) nanosheets are optimized as a function of their surface properties. Beyond the contribution of oxygen-containing groups, an extra contribution from the reversible adsorption/desorption of H+ on carbon atom of rGO sheets is confirmed. Electrochemical analysis and density functional theory calculations reveal that H+ induces disruption of pi cloud in aromatic domain, accompanied by C sp(2)-sp(3) re-hybridization and the distortion/restoration of graphitic structure. The optimal electrochemical performance with a specific capacitance of 245 F g(-1) at 0.5 A g(-1) with 53% retention at 20 A g(-1) is achieved for rGO thermally treated at 200 degrees C. As a proof-of-concept application, the 3D printed rGO electrode delivers a high areal capacitance of 1011 mF cm(-2) and an energy density of 266 mu Wh cm(-2). The study is believed to broaden the horizons of proton adsorption chemistry and shed light on the design of novel electrode materials.
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