Designed Synthesis of Well-Defined Pd@Pt Core-Shell Nanoparticles with Controlled Shell Thickness as Efficient Oxygen Reduction Electrocatalysts

被引：92

作者：

Choi, Ran ^{[1
,2
]}

Choi, Sang-Il ^{[1
,2
]}

Choi, Chang Hyuck ^{[3
]}

Nam, Ki Min ^{[1
,2
]}

Woo, Seong Ihl ^{[3
]}

Park, Joon T. ^{[1
,2
]}

Han, Sang Woo ^{[1
,2
,4
]}

机构：

[1] Korea Adv Inst Sci & Technol, Dept Chem, Taejon 305701, South Korea

[2] Korea Adv Inst Sci & Technol, KI NanoCentury, Taejon 305701, South Korea

[3] Korea Adv Inst Sci & Technol, Dept Chem & Biomol Engn, Taejon 305701, South Korea

[4] Inst for Basic Sci Korea, Ctr Nanomat & Chem React, Taejon 305701, South Korea

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2013年 / 19卷 / 25期

基金：

新加坡国家研究基金会;

关键词：

electrochemistry; fuel cells; nanoparticles; palladium; platinum; PARTICLE-SIZE; PLATINUM NANOPARTICLES; CATALYSTS; NANOCRYSTALS; ELECTROLYTE; INSTABILITY; SURFACES; IMPACT; ALLOY;

D O I：

10.1002/chem.201203834

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Improving the electrocatalytic activity and durability of Pt-based catalysts with low Pt content toward the oxygen reduction reaction (ORR) is one of the main challenges in advancing the performance of polymer electrolyte membrane fuel cells (PEMFCs). Herein, a designed synthesis of well-defined Pd@Pt core-shell nanoparticles (NPs) with a controlled Pt shell thickness of 0.4-1.2nm by a facile wet chemical method and their electrocatalytic performances for ORR as a function of shell thickness are reported. Pd@Pt NPs with predetermined structural parameters were prepared by in situ heteroepitaxial growth of Pt on as-synthesized 6nm Pd NPs without any sacrificial layers and intermediate workup processes, and thus the synthetic procedure for the production of Pd@Pt NPs with well-defined sizes and shell thicknesses is greatly simplified. The Pt shell thickness could be precisely controlled by adjusting the molar ratio of Pt to Pd. The ORR performance of the Pd@Pt NPs strongly depended on the thickness of their Pt shells. The Pd@Pt NPs with 0.94nm Pt shells exhibited enhanced specific activity and higher durability compared to other Pd@Pt NPs and commercial Pt/C catalysts. Testing Pd@Pt NPs with 0.94nm Pt shells in a membrane electrode assembly revealed a single-cell performance comparable with that of the Pt/C catalyst despite their lower Pt content, that is the present NP catalysts can facilitate low-cost and high-efficient applications of PEMFCs.

引用

页码：8190 / 8198

页数：9

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