镧掺杂的二氧化锰/碳纳米管电化学超级电容器复合电极

引用本文: 薛荣, 阎景旺, 田颖, 衣宝廉. 镧掺杂的二氧化锰/碳纳米管电化学超级电容器复合电极[J]. 物理化学学报, 2011, 27(10): 2340-2346. doi: 10.3866/PKU.WHXB20111002 shu

Citation: XUE Rong, YAN Jing-Wang, TIAN Ying, YI Bao-Lian. Lanthanum Doped Manganese Dioxide/Carbon Nanotube Composite Electrodes for Electrochemical Supercapacitors[J]. Acta Physico-Chimica Sinica, 2011, 27(10): 2340-2346. doi: 10.3866/PKU.WHXB20111002 shu

镧掺杂的二氧化锰/碳纳米管电化学超级电容器复合电极

基金项目:
中国科学院大连化学物理研究所重要方向性项目"

电动汽车用超级电容器储能系统的研究与开发"

摘要: 尽管在二氧化锰/多壁碳纳米管(MnO₂/MWCNTs)上获得了较高的比电容, 低电导率仍是制约MnO₂担载量或膜厚度提高的主要障碍. 另一个问题是MnO₂/MWCNTs 的循环稳定性远低于活性炭. 所以截止到目前这一新型材料的应用仍然受到很大的限制. 本文采用原位还原的方法制备镧掺杂二氧化锰/多壁碳纳米管电化学超级电容器复合电极材料. 分别通过透射电镜(TEM)、扫描电镜(SEM)、X射线衍射(XRD)和傅里叶变换红外(FTIR)光谱等技术对这些复合材料的形貌与结构进行了分析. 采用循环伏安法、恒电流充放电法和交流阻抗法对其进行了电化学性能的研究. 研究结果表明, 通过还原MnO₄^- 可以在MWCNTs 上形成La 掺杂MnO₂复合材料. La 掺杂降低了复合电极的电阻, 这是因为La 的引入可以增大MnO₂的晶格缺陷, 从而提高材料的电导率以及电极的电化学性能. 因此La 掺杂是克服MnO₂本征导电性差的有效途径之一. 掺杂La 可以在不增大电极电阻的情况下提高MnO₂的担载量或膜厚度. La 掺杂的更重要的作用是使以MnO₂/MWCNTs 作电极的对称电化学超级电容器的循环性能得到显著改善. 此外, La掺杂也使复合电极的比电容得到一定程度的提高.

关键词:

English

Lanthanum Doped Manganese Dioxide/Carbon Nanotube Composite Electrodes for Electrochemical Supercapacitors

1.
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning Province, P. R. China
Received Date: 24 February 2011
Available Online: 27 September 2011
Fund Project:
中国科学院大连化学物理研究所重要方向性项目"

电动汽车用超级电容器储能系统的研究与开发"

Abstract: Although higher specific capacitances have been achieved for manganese dioxide/multi-walled carbon nanotubes (MnO₂/MWCNTs), the low conductivity of MnO₂ is still the main obstacle in increasing its loading or film thickness. Another problem is that the cycling stability of MnO₂/MWCNTs is much lower than that of activated carbon electrodes. Therefore, this new type of electrode material is still limited in application until now. In this paper, lanthanum doped MnO₂/MWCNTs composites were prepared by an in situ redox method. The surface morphology and phase structure of the as-prepared samples were investigated by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared (FTIR) spectrometry. The electrochemical properties were investigated by cyclic voltammetry (CV), galvanostatic charge/discharge, and electrochemical impedance spectroscopy (EIS). The La-doped MnO₂ could be formed on the MWCNTs by the reduction of MnO₄^-. The resistance of the composite electrodes decreased because La doping increases the number of imperfections in the MnO₂ lattice, which improves the electrical conductivity and the electrochemical activity of the electrode. La doping is, therefore, an effective way to overcome the intrinsic low electric conductivity of MnO₂, which facilitates an increase in the loading or the film thickness of MnO₂ without increasing electrode resistance. The major effect of La doping is a significant improvement in the charge/discharge cycling performance of a symmetric electrochemical supercapacitor with electrodes composed of MnO₂/ MWCNTs. The specific capacitance of the composite electrodes was improved by La doping.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

镧掺杂的二氧化锰/碳纳米管电化学超级电容器复合电极

English

Lanthanum Doped Manganese Dioxide/Carbon Nanotube Composite Electrodes for Electrochemical Supercapacitors

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

镧掺杂的二氧化锰/碳纳米管电化学超级电容器复合电极

English

Lanthanum Doped Manganese Dioxide/Carbon Nanotube Composite Electrodes for Electrochemical Supercapacitors

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

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