Yurun Zhang , Hong Zheng , Qin Wang , Yuting Huang , Wenquan Li , Jing Xiang , Wenjing Huang , Peng Yuan , Hao Xue , Shuya Wang , Yun Zhou , Wei Lu , Xian Yang
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引用次数: 0
Abstract
Efficient and sustainable biochar as electrode material is the key to constructing portably green energy storage equipment. Using waste aucklandia lappa straw as carbon precursor, biomass porous carbon was prepared by high temperature carbonization and KOH activation. The 3-dimensional porous carbon material was obtained by optimizing the proportion of activator, which has a high specific surface area (2427 m2 g−1), abundant pore structure and substantially high specific capacitance (up to 431.35 F g−1 at 0.5 A g−1). The assembled symmetrical supercapacitor exhibits a wide voltage range of 0–2.0 V and a high energy density of 36.51 Wh kg−1 in 1 M Na2SO4 electrolyte. The all-solid-state supercapacitor with PVA/KOH gel as electrolyte has high response frequency and phase angle, which can provide high specific capacitance of 340.98 F g−1 and energy density of 19.59 Wh kg−1 at 0.5 A g−1. The capacitance retention rate is 89.47% after 10,000 cycles. Aucklandia lappa straw-derived porous carbon electrode material is an ideal candidate for the preparation of high-performance supercapacitor.
期刊介绍:
The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied.
Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.