Laser-assisted preparation of vertically aligned reduced graphene oxide/tannic acid arrays for flexible aqueous zinc-ion hybrid capacitors

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作   者：

Yan Chen;  Lijuan Xiao;  Yuqi Li;  Jianhui Qiu;  Limin Zang;  Chao Yang; 

作者机构：

Guangxi Key Laboratory of Optical and Electronic Materials and Devices;  Guihn 541004;  Faculty of Systems Science and Technology;  Key Laboratory of New Processing Technologyfor Nonferrous Metal and Materials (Ministry of Education);  Yurihonjo 015-0055;  Japan;  Guialin University of Technology;  Department of Machine Intelligence and Systems Engineering;  Guangxi Colleges and Universities Key Laboratory of Natural and Biomedical Polymer Materials;  China;  Akita Prefectwal University; 

关键词：

Tannic acid;  Carbon materials;  Laser assistance;  Flexible zinc-ion hybrid capacitors;  Vertical alignment; 

期刊名称：

Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials

i s s n：

0169-4332

年卷期：

2024 年 665 卷 Aug.30 期

页   码：

160230.1-160230.10

页   码：

摘   要：

Aqueous zinc-ion hybrid capacitors (AZHCs) are considered an encouraging energy storage candidate owing to their promising environmental benignity and electrochemical performance. To give full play to the advantages of AZHCs, vertically aligned reduced graphene oxide/tannic acid (V-rGO/TA) arrays are constructed on the laser-pretreated graphite paper (LGP) as flexible carbon-based cathodes (V-rGO/TA/LGP) for AZHCs by a facile laser reduction method. The vertical structure of rGO exhibits abundant physical adsorption sites and ion/electron transfer channels, and the residual oxygen-containing groups of rGO provide favored chemical adsorption sites, which can enhance Zn~(2+) ion storage. In addition, the TA molecules contribute extra capacity by reversible redox reaction (phenol-quinone transition), further improving the electrochemical performance of the electrode. Consequently, the assembled quasi-solid-state AZHC based on the optimized V-rGO/TA/LGP cathode possesses a high specific capacity of 136.6 (μAh cm~(-2) and a maximum energy density of 109.3 μWh cm~(-2). In addition, the device exhibits good flexibility with a capacity retention of 97.0 % even after 3000 bending cycles. This design strategy opens up a new approach to construct a vertically aligned carbon material for achieving high-performance flexible AZHCs and realizing their practical applications.