Abstract The development of direct methanol fuel cells (DMFCs) is partially limited by the poor kinetics of methanol oxidation reaction (MOR) at the anode side. It was reported that the interaction between Pt and CeO2 enhances the electrocatalytic performance of Pt catalyst for MOR. In this work, a hybrid material (CeO2–C) composed of CeO2 and carbon was successfully prepared by a simple hydrothermal method followed by calcination in inert atmosphere. The hierarchically porous nanostructure and especially good electronic conductivity of CeO2–C make it an excellent support for Pt particles for application in electrocatalytic process. TEM investigation reveals that triple-phase interface of Pt, carbon and CeO2 forms in Pt/CeO2–C catalyst. Performance of the as-prepared catalyst for MOR was studied in alkaline medium. The Pt/CeO2–C catalyst shows superior catalytic performance for MOR compared with Pt/CeO2 and the physical mixture of Pt/CeO2 and acetylene black (Pt/CeO2+C). The significantly improved performance can be attributed to the synergetic effect between Pt particles and CeO2–C support, and the better conductivity of CeO2–C. This study provides a possible method to expand the application potential of CeO2 materials in MOR, and may also be used in other electrocatalytic process.

中文翻译：

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介孔 CeO2-C 杂化球作为铂纳米粒子对甲醇电催化氧化的有效载体

摘要 直接甲醇燃料电池 (DMFC) 的发展在一定程度上受到阳极侧甲醇氧化反应 (MOR) 不良动力学的限制。据报道，Pt 和 CeO2 之间的相互作用增强了 Pt 催化剂对 MOR 的电催化性能。在这项工作中，由 CeO2 和碳组成的混合材料 (CeO2-C) 通过简单的水热法成功制备，然后在惰性气氛中煅烧。CeO2-C 的分级多孔纳米结构和特别好的电子导电性使其成为 Pt 颗粒在电催化过程中应用的极好载体。TEM 研究表明，在 Pt/CeO2-C 催化剂中形成了 Pt、碳和 CeO2 的三相界面。在碱性介质中研究了所制备的 MOR 催化剂的性能。与 Pt/CeO2 以及 Pt/CeO2 和乙炔黑的物理混合物 (Pt/CeO2+C) 相比，Pt/CeO2-C 催化剂对 MOR 显示出优异的催化性能。显着改善的性能可归因于 Pt 颗粒和 CeO2-C 载体之间的协同作用，以及 CeO2-C 更好的导电性。该研究为扩大CeO2材料在MOR中的应用潜力提供了一种可能的方法，也可用于其他电催化过程。