Study of the Electrochemical Activities of Mo-Modified Pt Catalysts, for Application as Anodes in Direct Methanol Fuel Cells: Effect of the Aggregation Route
Study of the Electrochemical Activities of Mo-Modified Pt Catalysts, for Application as Anodes in Direct Methanol Fuel Cells: Effect of the Aggregation Route
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DOI：
10.1149/2.0521503jes
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发表时间：
2015
影响因子：
3.9
通讯作者：
O. Ugalde-Reyes;R. Hernández-Maya;A. L. Ocampo-Flores;F. Ramírez;E. Sosa-Hernández;C. Angeles-Chávez;P. Roquero
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文献类型：
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作者：
O. Ugalde-Reyes;R. Hernández-Maya;A. L. Ocampo-Flores;F. Ramírez;E. Sosa-Hernández;C. Angeles-Chávez;P. Roquero
采用热解（thr）和硼氢化物（bhr）还原方法并使用不同的金属前体合成了具有恒定金属组成的电催化剂，由碳负载的铂和钼相组成。通过X射线能谱、X射线衍射和高分辨率透射电子显微镜对所得电催化剂进行了表征。通过循环伏安法研究它们的活性。获得了不同的表面结构并比较了甲醇氧化的电化学活性。使用所使用的表征技术可以很好地识别 Pt、MoO2 和 MoO3 相。然而，两个样品系列获得的电化学响应有很大不同，这表明活性相之间的排列和关系很大程度上取决于金属前体的合成方法和聚集顺序，并且是氧化钼相不同催化活性和稳定性的原因。 bhr 方法比 thr 方法具有更高的活性。在通过bhr方法获得的样品系列中，通过在先前合成的碳载钼上沉积铂而获得的催化剂具有最高的总体活性。 © 作者 2014。ECS 出版。这是一篇根据知识共享署名非商业性无衍生品 4.0 许可证（CC BY-NC-ND，http://creativecommons.org/licenses/by-nc-nd/4.0/）条款分发的开放获取文章，该许可证允许在任何媒体中非商业性地重复使用、分发和复制，前提是原始作品不以任何方式更改并正确引用。如需商业再利用许可，请发送电子邮件至：oa@ electrochem.org。 [DOI：10.1149/2.0521503jes] 保留所有权利。
Electrocatalysts with constant metallic composition, consisting of carbon-supported platinum and molybdenum phases, were synthesized following the thermolysis (thr) and borohydride (bhr) reduction methods and using different metallic precursors. The obtained electrocatalysts were characterized by X-ray energy-dispersive spectrometry, X-ray diffraction and high resolution transmission electron microscopy. Their activities were studied by cyclic voltammetry. Different surface structures were obtained and the electrochemical activities toward methanol oxidation were compared. Pt, MoO2 and MoO3 phases were well identified with the characterization techniques used. However, the electrochemical responses obtained from both sample series were considerably different, suggesting that the arrangement and relationships between active phases strongly depend on the synthesis method and aggregation sequence of the metallic precursors, and being the cause of different catalytic activities and stabilities of molybdenum oxide phases. The bhr method offered higher activity than the thr method. Among the sample series obtained by bhr method, the catalyst obtained by platinum deposition on the previously synthesized molybdenum on carbon, led to the highest overall activity. © The Author(s) 2014. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives 4.0 License (CC BY-NC-ND, http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in any way and is properly cited. For permission for commercial reuse, please email: oa@electrochem.org. [DOI: 10.1149/2.0521503jes] All rights reserved.