Abstract Bimetallic Pt-based catalysts have been extensively investigated to enhance the performance of direct methanol fuel cells (DMFCs) because CO, a by-product, reduces the activity of the pure Pt catalysts. Herein, we synthesized Pt-Pb hexagonal nanoplates as a model catalyst for the methanol oxidation reaction (MOR) and further controlled the Pt and Pb distributions on the surface of the nanoplates through acetic acid (HAc) treatment. As a result, we obtained Pt-Pb nanoplates and HAc-treated Pt-Pb nanoplates with homogeneous and heterogeneous distributions of the Pt-Pb alloy surfaces, respectively. We showed that the MOR activity and stability of the Pt-Pb nanoplates improved compared to those of the HAc-treated Pt-Pb nanoplates, mainly due to the enhanced CO tolerance and the modified electronic structure of Pt under the influence of the oxophilic Pb.

中文翻译：

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Pt-Pb六方纳米片在电催化甲醇氧化反应中的表面元素分布效应

摘要 双金属 Pt 基催化剂已被广泛研究以提高直接甲醇燃料电池 (DMFC) 的性能，因为副产品 CO 会降低纯 Pt 催化剂的活性。在此，我们合成了 Pt-Pb 六边形纳米片作为甲醇氧化反应 (MOR) 的模型催化剂，并通过乙酸 (HAc) 处理进一步控制了纳米片表面的 Pt 和 Pb 分布。结果，我们分别获得了 Pt-Pb 纳米片和 HAc 处理的 Pt-Pb 纳米片，其 Pt-Pb 合金表面分布均匀和不均匀。我们表明，与 HAc 处理的 Pt-Pb 纳米板相比，Pt-Pb 纳米板的 MOR 活性和稳定性有所提高，