物理化学学报 >> 2011, Vol. 27 >> Issue (06): 1424-1430.doi: 10.3866/PKU.WHXB20110611

电化学和新能源 上一篇    下一篇

基于双相不锈钢制备超级电容器电极材料MnO2

李钊, 徐菊良, 李旭晏, 郭丽芳, 李劲, 蒋益明   

  1. 复旦大学材料科学系, 上海 200433
  • 收稿日期:2011-01-07 修回日期:2011-04-06 发布日期:2011-05-31
  • 通讯作者: 蒋益明 E-mail:corrosion@fudan.edu.cn
  • 基金资助:

    上海市自然科学基金(09ZR1402600), 上海市科委重点研究基金(09JC1401600), 上海市高新技术产业化重点项目计划及复旦大学本科生学术研究资助计划

Preparation of Manganese Dioxide for Electrodes of Supercapacitors Based on Duplex Stainless Steel

LI Zhao, XU Ju-Liang, LI Xu-Yan, GUO Li-Fang, LI Jin, JIANG Yi-Ming   

  1. Department of Materials Science, Fudan University, Shanghai 200433, R. P. China
  • Received:2011-01-07 Revised:2011-04-06 Published:2011-05-31
  • Contact: JIANG Yi-Ming E-mail:corrosion@fudan.edu.cn
  • Supported by:

    The project was supported by the Shanghai Natural Science Foundation, China (09ZR1402600), Shanghai Science and Technology Development Key Research Funds, China (09JC1401600), Shanghai High and New Technology′s Industrialization Project and FDUROP, China.

摘要:

用恒电位沉积法在2304双相不锈钢基板上制备了纳米结构MnO2薄膜. 用X射线衍射(XRD)、扫描电子显微镜(SEM)以及X射线能量色散谱(EDS)表征了MnO2薄膜的结构、表面形貌和成分. 用循环伏安(CV)、恒流充放电和电化学阻抗谱(EIS)对MnO2电化学性能进行测试和分析. 结果表明, 沉积得到了由100-200 nm纳米棒组成的无定形MnO2薄膜. 随着MnO2质量的增加, 其绝对电容增加, 而比电容逐渐下降; 随着循环伏安扫描速率的增加, 其比电容也逐渐下降. 当MnO2的质量为0.09 mg, 扫描速率为20 mV·s-1时, 比电容达到最大值288.9 F·g-1. 在100 mV·s-1的扫描速率下进行500次CV循环, 其比电容维持在一个稳定值, 且随着循环次数的增加, 比电容略有提高.

关键词: 超级电容器, MnO2, 电沉积, 比电容, 电极材料

Abstract:

A nano-structured manganese dioxide thin film was electrochemically deposited onto a 2304 duplex stainless steel (DSS) electrode. The structure, surface morphology, and composites of the obtained manganese dioxide were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray energy dispersive spectroscopy (EDS), respectively. The electrochemical characteristics of the manganese dioxide electrodes were investigated by cyclic voltammetry (CV), chronopotentiometry, and electrochemical impedance spectroscopy (EIS). The obtained manganese dioxide was found to be amorphous and the surface was composed of nanorods with lengths between 100 and 200 nm. As the mass of the manganese dioxide increased the capacitance also increased while the specific capacitance decreased. With an increase in the CV scan rate the specific capacitance decreased as well. The highest specific capacitance value of 288.9 F·g-1 was obtained at a scan rate of 20 mV·s-1 when the mass of manganese dioxide was 0.09 mg. 500 cycles were carried out at a rate of 100 mV·s-1 and we found that the specific capacitance remained stable and even increased slightly as the cycles increased.

Key words: Supercapacitor, MnO2, Electrodeposition, Specific capacitance, Electrode material

MSC2000: 

  • O646