Effects of Acid Treatment of Pt-Ni Alloy Nanoparticles@Graphene on the Kinetics of the Oxygen Reduction Reaction in Acidic and Alkaline Solutions
Effects of Acid Treatment of Pt-Ni Alloy Nanoparticles@Graphene on the Kinetics of the Oxygen Reduction Reaction in Acidic and Alkaline Solutions
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DOI：
10.1021/jp108305v
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发表时间：
2011-01
影响因子：
3.7
通讯作者：
Ke Zhang;Qiaoli Yue;Guifen Chen;Yanling Zhai;Lei Wang;Huaisheng Wang;Jinsheng Zhao;Jifeng Liu-Jifeng-Li
中科院分区：
文献类型：
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作者：
Ke Zhang;Qiaoli Yue;Guifen Chen;Yanling Zhai;Lei Wang;Huaisheng Wang;Jinsheng Zhao;Jifeng Liu-Jifeng-Li
在燃料电池运行过程中，过渡金属在铂基合金催化剂上的酸溶是不可避免的。在这项工作中，我们研究了酸处理的石墨烯支持的Pt 1 Nix（x = 0，0.25，0.5，1，和2）合金的ORR在碱性和酸性溶液中的动力学的影响，以及在碱性溶液中的OH自由基的产生。采用共浸渍法和化学还原法合成了纳米合金。通过X射线光电子能谱、X射线衍射、透射电子显微镜和高分辨透射电子显微镜对合金的电子和结构特征进行了表征。分别在0.05 M H2SO 4和0.1 M NaOH中使用循环伏安法和旋转环盘电极技术研究了ORR性能。合金催化剂比纯Pt对ORR的活性更高，酸处理后，Pt-Ni合金在酸性和碱性条件下的ORR活性都得到了提高。
Acidic dissolution of transition metals from Pt based alloy catalysts for oxygen reduction reaction (ORR) is an unavoidable process during fuel cell operation. In this work we studied the effect of acid treatment of graphene-supported Pt1Nix(x = 0, 0.25, 0.5, 1, and 2) alloys on the kinetics of the ORR in both alkaline and acidic solutions together with the generation of OH radicals in alkaline solutions. The alloy nanoparticles were synthesized through coimpregnation and chemical reduction. The electronic and structural features of the alloy were characterized by X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscopy, and high-resolution transmission electron microscopy. The ORR performances were studied using cyclic voltammetry and rotating ring disk electrode techniques in 0.05 M H2SO4 and 0.1 M NaOH, respectively. The alloy catalysts were more active than pure Pt toward ORR, and after acid treatment the ORR activity of Pt−Ni alloy was enhanced in both acidic and alkaline...