期刊
RSC ADVANCES
卷 12, 期 39, 页码 25807-25814出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ra03949d
关键词
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资金
- Fundamental Research Funds for Central Universities [BJFU-2021ZY28]
- National Natural Science Foundation of China [61874111]
- Scientific and Technological Innovation Projects of Shandong Province [2019JZZY020223]
- Hebei Province Central Finance Forest and Grass Science and Technology Promotion Demonstration Project [JI-TG [2022]004]
This article introduces a one-step hydrothermal method to fabricate oxygen-doped activated carbon/graphene composite hydrogels. The composite hydrogels have low cost, high specific surface area, and high conductivity, making them suitable for flexible and wearable energy storage devices. They exhibit excellent energy storage performance and cycling stability.
Flexible supercapacitors have attracted widespread attention from many researchers as a type of portable energy storage device. As a unique carbon material, graphene has shown great potential in supercapacitor electrodes, mainly due to its large theoretical specific surface area, high conductivity and chemical stability. Therefore, reasonable design of graphene-based hydrogels with low cost, high specific surface area, and excellent mechanical properties is of great significance for flexible and wearable energy storage device applications. Oxygen-doped activated carbon/graphene composite hydrogels have been fabricated using a one-step hydrothermal method. In the hybrid hydrogel, the activated carbon derived from chitosan with high specific surface area and oxygen-containing groups which were introduced by using a facile room-temperature oxidation strategy with HNO3 are assembled into the framework of reduced graphene oxide (rGO) to effectively prevent the restacking of rGO nanosheets and result in high specific surface area and high conductivity of the composite hydrogels, thereby leading to an excellent energy storage performance. The optimal sample displayed a high specific capacitance of 375.7 F g(-1) in 1 M H2SO4 electrolyte at a current density of 1 A g(-1). Furthermore, the assembled flexible supercapacitor showed an ideal cycling stability of 83% after 5000 charge/discharge cycles at 10 A g(-1). The facile strategy developed in this work is of significance for the performance improvement of supercapacitor electrode materials.
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