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

被引：32
作者：
Kim, Hee Jin [1 ,2 ]
Ahn, Yong-Deok [1 ,2 ]
Kim, Jeonghyeon [1 ,2 ]
Kim, Kyoung-Su [3 ]
Jeong, Yeon Uk [4 ]
Hong, Jong Wook [3 ]
Choi, Sang-Il [1 ,2 ]
机构：
[1] Kyungpook Natl Univ, Dept Chem, Daegu 41566, South Korea
[2] Kyungpook Natl Univ, Green Nano Mat Res Ctr, Daegu 41566, South Korea
[3] Univ Ulsan, Dept Chem, Ulsan 44610, South Korea
[4] Kyungpook Natl Univ, Sch Mat Sci & Engn, Daegu 41566, South Korea
来源：
CHINESE JOURNAL OF CATALYSIS | 2020年 / 41卷 / 05期
基金：
新加坡国家研究基金会;
关键词：
Platinum; Lead; Nanoplate; Surface atomic distribution; Methanol oxidation reaction; HIGH-INDEX FACETS; OXYGEN REDUCTION; CONCAVE NANOCUBES; FUEL-CELLS; NANOPARTICLES; MECHANISM; ELECTROOXIDATION; NUCLEATION; GROWTH; CO;
D O I：
10.1016/S1872-2067(19)63310-3
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
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. (C) 2020, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码：813 / 819
页数：7
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