The capacitive properties of amorphous manganese dioxide electrodeposited on different thermally-treated carbon papers

IF 5.5 3区 材料科学 Q1 ELECTROCHEMISTRY Electrochimica Acta Pub Date : 2013-02-28 DOI:10.1016/j.electacta.2012.12.114
Hua Zhao, Gaoyi Han, Yunzhen Chang, Miaoyu Li, Yanping Li
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引用次数: 24

Abstract

The surface structure of the commercial carbon paper (CP) has been modified through thermal treatment, and then MnO2 was electrodeposited on the thermally-treated carbon paper (TTCP) by cyclic voltammetry (CV) method in the phosphate buffer solution (PBS, pH 9.18) containing KMnO4. The obtained samples were characterized by X-ray diffraction (XRD), X-ray photoelectron energy spectroscopy (XPS) and scanning electron microscopy (SEM). The results showed that the phase of the obtained MnO2 was amorphous, and that the morphology of the MnO2 deposited on the substrates was influenced strongly by the substrates. The capacitive properties of MnO2 deposited on the carbon substrates were investigated by CV, galvanostatic charge/discharge, electrochemical impedance spectroscopy technique. It was found that the specific capacitance of MnO2 deposited on the optimum TTCP can reach to 749 F g−1 based on the charge/discharge measurement, which was far larger than that on the CP (345 F g−1).

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电沉积在不同热处理碳纸上的无定形二氧化锰的电容性能
通过热处理改性商品碳纸(CP)的表面结构,然后在含KMnO4的磷酸盐缓冲溶液(PBS, pH 9.18)中,用循环伏安法(CV)将MnO2电沉积在热处理后的碳纸(TTCP)上。采用x射线衍射(XRD)、x射线光电子能谱(XPS)和扫描电镜(SEM)对所得样品进行了表征。结果表明:制备的MnO2相呈无定形,沉积在基体上的MnO2的形貌受到基体的强烈影响。采用CV、恒流充放电、电化学阻抗谱等技术研究了沉积在碳基上的二氧化锰的电容性。通过充放电测试发现,在最佳TTCP上沉积的MnO2的比电容可达749 F g−1,远远大于在CP上沉积的345 F g−1。
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来源期刊
Electrochimica Acta
Electrochimica Acta 工程技术-电化学
CiteScore
11.30
自引率
6.10%
发文量
1634
审稿时长
41 days
期刊介绍: Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.
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