Hierarchical Porous Carbon Materials Derived from Kelp for Superior Capacitive Applications
Publication in refereed journal

香港中文大學研究人員
替代計量分析
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摘要The lack of high-performance electrode materials is the main factor restricting the breakthrough of capacitive applications. Recently, integrating the advantages of different pore structures to optimize the material's performance has led to great interest in the design of hierarchical porous carbon (HPC). Renewable, economical, and widely available kelp was selected as the carbon source to obtain a mesoporous structure using its naturally contained salts (Ca, Na, and so on) as template in this work. Subsequent chemical activation was used to get multimodal pores, and enrich the micropore structure. The micropores increase the specific surface area and provided abundant available adsorption sites, while mesopores improve not only the ionic conductivity but also the wettability of the material which is crucial in electrochemically related applications. When assembled in a pouch cell (capacitor), HPC showed a high specific capacitance of 190 F g(-1) (1 A g(-1), 1 mol L-1 TEABF(4)/AN) with a broad operation voltage range (0-2.7 V). Further applied to electric double-layer based capacitive deionization (CDI), it exhibited excellent salt removing capacity (27.2 mg g(-1)) with rapid response and efficient circularity. These excellent properties mainly result from its high surface area (2613.7 m(2) g(-1)) and unique multimodal porous structure. We also verified the superior performance of a HPC material assembled CDI device driven by a pouch cell for energy-integrated applications.
著者Sun N, Li ZY, Zhang X, Qin WX, Zhao CJ, Zhang HM, Ng DHL, Kang SH, Zhao HJ, Wang GZ
期刊名稱ACS Sustainable Chemistry and Engineering
出版年份2019
月份5
卷號7
期次9
出版社AMER CHEMICAL SOC
頁次8735 - 8743
國際標準期刊號2168-0485
語言英式英語
關鍵詞kelp, hierarchical pore, supercapacitor, capacitive deionization
Web of Science 學科類別Chemistry, Multidisciplinary;Green & Sustainable Science & Technology;Engineering, Chemical;Chemistry;Science & Technology - Other Topics;Engineering

上次更新時間 2021-18-01 於 01:38