Synthesis of Pt and bimetallic PtPd nanostructures on Au nanoparticles for use as methanol tolerant oxygen reduction reaction catalysts
Synthesis of Pt and bimetallic PtPd nanostructures on Au nanoparticles for use as methanol tolerant oxygen reduction reaction catalysts
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DOI：
10.1039/c5nj00998g
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发表时间：
2015-07
影响因子：
3.3
通讯作者：
In-Su Park;Ok-Hee Kim;J. Kim;Baeck B. Choi;Yong‐Hun Cho;Y. Sung
中科院分区：
文献类型：
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作者：
In-Su Park;Ok-Hee Kim;J. Kim;Baeck B. Choi;Yong‐Hun Cho;Y. Sung
采用连续还原法制备了具有核壳结构的Au-PtPd/C和Au-PtPd/C纳米颗粒。核壳结构分析表明，纳米粒子均匀分布在碳颗粒上，并选择性地在Au表面沉积了铂和双金属PtPd结构。考察了纳米粒子在含和不含甲醇的硫酸溶液中的氧还原反应(ORR)活性。在Au-Pt和Au-PtPd纳米粒子中，随着Pd含量的增加，在无CH3OH溶液中的ORR活性降低，而且Au-PtPd纳米粒子由于其对甲醇氧化的耐受性增强而表现出比Au-PtPd纳米粒子更高的活性。因此，Au-PtPd纳米粒子的高耐甲醇氧化反应能力归因于其薄结构和双金属PtPd组成的协同效应。
Core–shell structured Au–PtPd/C and Au–Pt/C nanoparticles (NPs) were prepared using a successive reduction process on carbon supported Au with PtPd and Pt particles. Structural analyses of the core–shell NPs revealed uniformly distributed fine particles (<5 nm in diameter) on carbon particles and selectively deposited Pt and bimetallic PtPd structures on the Au surface. The activity of the NPs was investigated for the oxygen reduction reaction (ORR) in both H2SO4 solutions with and without CH3OH. In Au–Pt and Au–PtPd NPs, the activities for the ORR decreased in the solution without CH3OH as the amount of Pd increased; moreover, Au–PtPd NPs showed higher activity than Au–Pt NPs in solution with CH3OH due to its enhanced tolerance for methanol oxidation. Thus, the high methanol oxidation reaction tolerance of Au–PtPd NPs is ascribed to the synergistic effect resulting from its thin structure and bimetallic PtPd composition.