Synthesis and Oxygen Reduction Electrocatalytic Property of Pt-on-Pd Bimetallic Heteronanostructures
Synthesis and Oxygen Reduction Electrocatalytic Property of Pt-on-Pd Bimetallic Heteronanostructures
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DOI：
10.1021/ja902256a
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发表时间：
2009-06-10
影响因子：
15
通讯作者：
Yang, Hong
中科院分区：
文献类型：
--
作者：
Peng, Zhenmeng;Yang, Hong
采用顺序合成法制备了铂/钯纳米异质纳米结构，在该异质纳米结构中，3-nm的Pt颗粒生长在5-nm的Pd纳米颗粒的表面.碳载Pt-on-Pd异质纳米结构的电化学研究表明，与商业铂催化剂（E-TEK，20重量% Pt，直径：2.5 nm）相比，不仅增强了氧还原反应（ORR）的电催化活性，而且大大提高了稳定性。Pd的引入极大地抑制了活性中心上的羟基吸附，这归因于活性的增强，而由于大的总粒径和独特的结构，活性表面积、形态和组成的保留可能是超过30 000次循环的稳定性大大提高的关键因素。我们的工作表明，非均相铂-金属纳米结构为设计分级有序的多功能燃料电池催化剂提供了新的机会。
Platinum-on-palladium bimetallic heterogeneous nanostructures were prepared using a sequential synthetic method, in which 3-nm Pt particles grew on the surfaces of 5-nm Pd nanoparticles. Electrochemical study of carbon-supported Pt-on-Pd heteronanostructures shows not only enhancement in electrocatalytic activity for oxygen reduction reaction (ORR) but also much improved stability in comparison to a commercial platinum catalyst (E-TEK, 20 wt % Pt, diameter: 2.5 nm). The greatly suppressed hydroxyl adsorption on active sites by introducing Pd was attributed to the enhanced activity, while the retention of active surface area, morphology, and composition because of the large overall bimetallic particle size and unique architectures could be the key factors for the much improved stability over 30 000 cycles. Our work shows heterogeneous platinum-on-metal bimetallic nanostructures offer new opportunities to the design of hierarchically ordered multifunctional fuel cell catalysts.