Surface elemental distribution effect of Pt-Pb hexagonal nanoplates for electrocatalytic methanol oxidation reaction

doi:10.1016/S1872-2067(19)63310-3

Abstract

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.

Key words: Platinum, Lead, Nanoplate, Surface atomic distribution, Methanol oxidation reaction

Hee Jin Kim, Yong-Deok Ahn, Jeonghyeon Kim, Kyoung-Su Kim, Yeon Uk Jeong, Jong Wook Hong, Sang-Il Choi. Surface elemental distribution effect of Pt-Pb hexagonal nanoplates for electrocatalytic methanol oxidation reaction[J]. Chinese Journal of Catalysis, 2020, 41(5): 813-819.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(19)63310-3

https://www.cjcatal.com/EN/Y2020/V41/I5/813

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