Pt/C催化剂氧还原反应的交流阻抗动态研究 |
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引用本文: | 史坤明,郭建伟,王佳.Pt/C催化剂氧还原反应的交流阻抗动态研究[J].电化学,2016,22(5):542. |
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作者姓名: | 史坤明 郭建伟 王佳 |
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作者单位: | 1.中国海洋大学化学化工学院,山东青岛 266003; 2. 清华大学核能与新能源技术研究院,北京 100084 |
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基金项目: | 国家自然科学基金项目(51273103, 50873050, 51573084)、国家973计划(2012CB215500)资助 |
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摘 要: | 本文通过RDE和EIS联合技术、等效电路模型,研究了酸性体系中商业Pt/C催化剂ORR行为. 研究发现Pt/C动态界面包括两个彼此独立的过程:1)Pt表面原有PtO还原至Pt过程,2)ORR促进新PtO形成过程,为催化材料稳定性及活化性提供了关键依据;并发现动态界面促进多孔电极重构以及与传输匹配过程.在高过电位下,ORR的高反应速率可通过增加催化材料憎水性予以改善. 上述研究结果可对ORR的直流电化学研究进行有效补充,并提供建模基础.
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关 键 词: | 燃料电池 Pt/C催化剂 氧还原反应 旋转圆盘电极 电化学阻抗谱 |
收稿时间: | 2016-03-10 |
The Study of Dynamical Electrochemical Impedance Spectroscopy for Oxygen Reduction Reaction on Pt/C Catalyst |
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Abstract: | With joint techniques of rotating disc electrode(RDE) and electrochemical impedance spectroscopy(EIS), and further establishment on equivalent circuit model, this paper studied oxygen reduction reaction(ORR) on commercial Pt/C catalyst in acid medium. Our results found that the dynamical interface on Pt/C consists of two independent processes: 1) the PtO reduction from Pt surface, 2) the new PtO formation from ORR, thus providing key clues for catalyst stability and activity. This also implied that the dynamical interface facilitates reconstruction for porous electrode, and matches with mass transfer. One important issue is discovered that at high overpotential, the high reaction rate for ORR can be further improved if providing hydrophobicity on catalyst surface. All these efforts on ORR progress not only compensate for DC electrochemistry study, but also provide basis for future model establishment. |
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Keywords: | fuel cells Pt/C catalyst oxygen reduction reaction rotating disk electrode electrochemical impedance spectroscopy |
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