Microtube Bundle Carbon Derived from Paulownia Sawdust for Hybrid Supercapacitor Electrodes

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• 作者：Xiangrong Liu ; Mingtao Zheng ; Yong Xiao ; Yunhua Yang ; Lufeng Yang ; Yingliang Liu ; Bingfu Lei ; Hanwu Dong ; Haoran Zhang ; Honggang Fu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：June 12, 2013
• 年：2013
• 卷：5
• 期：11
• 页码：4667-4677
• 全文大小：872K
• 年卷期：v.5,no.11(June 12, 2013)
• ISSN：1944-8252

文摘

The structure and capacitive properties of microtube bundle carbons (MTBCs) from carbonization of paulownia sawdust (PS) followed by NaOH activation were investigated. Morphology analyses indicated that MTBCs had abundant micropores and mesopores with a high specific surface area of about 1900 m² g^鈥?. Cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy studies demonstrated the excellent charge storage, transfer capability, and low impedance of MTBCs. The specific capacitance of MTBCs-4 was as high as 227 F g^鈥? at 2 mV s^鈥?. Experimental results indicated that MTBCs provide smooth charge-transfer pathways for the ions in electrolytes and gateways to micropores and mesopores in the bulk. The hybrid supercapacitor model of MTBCs based on electrical double-layer capacitors and electrostatic capacitors was discussed and demonstrated. MTBCs are electrostatic capacitors at low frequency current, and may provide the pathways for easy accessibility of efficient charge transmission and high energy storage.

Keywords:

paulownia sawdust; microtube bundle carbons; macropores; gateways; electrical double-layer capacitors; electrostatic capacitors