Sonochemical assisted fabrication of 3D hierarchical porous carbon for high-performance symmetric supercapacitor
Publication in refereed journal

香港中文大學研究人員

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摘要A scalable fabrication of 3D hierarchical porous carbon structure (3D-HPC) has been achieved via a simple sonochemical route at different pyrolysis temperatures. It is worth noting that all the 3D-HPC samples possess oxygen-functional groups after activation by KOH and self-doped by nitrogen, which are beneficial to improving their surface wettability as well as increasing the electro-active surface area between the electrode and the surrounding electrolyte, consequently enhancing their electrochemical performance. Remarkably, the resulting carbon sample pyrolyzed at 850 degrees C (AC-850) possesses a maximum doping level of 2.75 at% and a high surface area of 1376.19 m(2) g(-1), which exhibits high electrochemical performance with high capacitance up to 269.19 F g(-1) at a current density of 2 A g(-1). Moreover remarkably, the AC-850-based symmetric supercapacitor delivers a high energy density of 21.4 Wh kg(-1) at a power density of 531.2 W kg(-1) with excellent rate performance and superior cycling stability (94.7% retention over 5000 cycles). The present approach is very suitable for large scale production of high-quality porous carbon materials at low cost, which can be used in different aspects, such as energy storage, gas storage, environmental remediation, and so on.
著者El-Khodary SA, Abomohra AEF, El-Enany GM, Aboalhassan AA, Ng DHL, Wang S, Lian JB
期刊名稱Ultrasonics Sonochemistry
出版年份2019
月份11
卷號58
出版社ELSEVIER
文章號碼104617
國際標準期刊號1350-4177
電子國際標準期刊號1873-2828
語言英式英語
關鍵詞Ultrasound, Porous carbon, Hierarchical structure, Nitrogen self-doping, Oxygen enriched, Supercapacitor
Web of Science 學科類別Acoustics;Chemistry, Multidisciplinary;Acoustics;Chemistry

上次更新時間 2021-21-01 於 00:29