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首页> 外文期刊>Journal of power sources >Preparation of La_(1-x)Ca_xMnO_3 perovskite-graphene composites as oxygen reduction reaction electrocatalyst in alkaline medium
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Preparation of La_(1-x)Ca_xMnO_3 perovskite-graphene composites as oxygen reduction reaction electrocatalyst in alkaline medium

机译：碱性介质中氧还原反应电催化剂La_（1-x）Ca_xMnO_3钙钛矿-石墨烯复合材料的制备

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摘要

La_(1-x)Ca_xMnO_3 perovskite-graphene composites are synthesized as catalysts for Zn-air cell cathodes. The samples are characterized by thermogravimetry-differential thermal analysis, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. Results show that perovskite particles are homogeneously dispersed on graphene nanosheets, and that doping Ca does not change the perovskite structure. Electrochemical properties are investigated by galvanostatic discharge, linear sweep voltammetry, and electrochemical impedance spectroscopy techniques. LaMnO_3 -graphene composites show superior performance than pure LaMnO_3. Doping Ca into the composites can tune their catalytic activity and sample prepared with x = 0.4 possesses the highest electrocatalytic activity. The measurement of the rotating ring-disk electrode reveals that the electron transfer number of La_(0.6)Ca_(0.4)MnO_3-graphene is 3.6. These results indicate that the La_(1-x)Ca_xMnO_3 -graphene composites are potential air electrodes catalysts.
机译：合成了La_（1-x）Ca_xMnO_3钙钛矿-石墨烯复合材料作为Zn-空气电池阴极的催化剂。样品通过热重分析-差热分析，X射线衍射，扫描电子显微镜，透射电子显微镜和X射线光电子能谱进行表征。结果表明钙钛矿颗粒均匀地分散在石墨烯纳米片上，掺杂Ca不会改变钙钛矿结构。通过恒电流放电，线性扫描伏安法和电化学阻抗谱技术研究电化学性能。 LaMnO_3-石墨烯复合材料的性能优于纯LaMnO_3。在复合物中掺入Ca可以调节其催化活性，x = 0.4制备的样品具有最高的电催化活性。旋转圆盘电极的测量表明，La_（0.6）Ca_（0.4）MnO_3-石墨烯的电子转移数为3.6。这些结果表明La_（1-x）Ca_xMnO_3-石墨烯复合材料是潜在的空气电极催化剂。

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  • 来源
    《Journal of power sources》 |2014年第10期|144-151|共8页
  • 作者

    Jie Hu; Lina Wang; Lina Shi; Hao Huang;

  • 作者单位

    Hebei Key Laboratory of Applied Chemistry, Department of Environment and Chemistry, Yanshan University, Qinhuangdao 066004, PR China,State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao 066004, PR China;

    Hebei Key Laboratory of Applied Chemistry, Department of Environment and Chemistry, Yanshan University, Qinhuangdao 066004, PR China;

    Hebei Key Laboratory of Applied Chemistry, Department of Environment and Chemistry, Yanshan University, Qinhuangdao 066004, PR China;

    State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao 066004, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Perovskite; Graphene; Alkaline electrolyte; Oxygen reduction reaction; Electrocatalyst;

    机译：钙钛矿;石墨烯碱性电解质;氧还原反应;电催化剂;

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