Mini-chunk biochar supercapacitors

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• 作者：Lei Zhang ; Junhua Jiang ; Nancy Holm ; Fangling Chen
• 关键词：Supercapacitor ; Biochar ; Mini ; chunk electrode ; Thin ; film electrode ; Maple wood
• 刊名：Journal of Applied Electrochemistry
• 出版年：2014
• 出版时间：October 2014
• 年：2014
• 卷：44
• 期：10
• 页码：1145-1151
• 全文大小：958 KB
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• 作者单位：Lei Zhang (1) (2)
  Junhua Jiang (1)
  Nancy Holm (1)
  Fangling Chen (2)
  
  1. Illinois Sustainable Technology Center, University of Illinois at Urbana-Champaign, Champaign, IL, 61820, USA
  2. Department of Mechanical Engineering, University of South Carolina, Columbia, SC, 29208, USA
  
• ISSN：1572-8838

文摘

Biochar prepared from the pyrolysis of maple wood was studied as supercapacitor electrode materials. Three kinds of electrodes were fabricated: mini-chunk electrodes, thin-film electrodes, and large-disk-chunk electrodes. Their capacitive behaviors were studied using cyclic voltammetry, galvanostatic charge–discharge, and electrochemical impedance spectroscopy. The mini-chunk supercapacitor shows an electrochemical behavior similar to the supercapacitor using the thin-film electrodes. It exhibits outstanding performance characteristic of a high specific capacitance of approximately 32?F?g? and a high stability without obvious capacitance decays upon 2,600 potential cycles. This indicates that the mini-chunk supercapacitor can be used as an mF-scale power source for electronic device applications. Moreover, the mini-chunk electrode provides a simple and fast technique to evaluate biochar materials used as potentially high-performance, low-cost, and environmental friendly supercapacitor electrodes without the need of binder and complicated fabrication procedures. However, the supercapacitor using large-disk-chunk biochar electrodes shows lower specific capacitive performance due to the high ohmic resistance stemming from long tubular structures within biochar.