Virus-templated Au and Au/Pt Core/shell Nanowires and Their Electrocatalytic Activitives for Fuel Cell Applications.
Virus-templated Au and Au/Pt Core/shell Nanowires and Their Electrocatalytic Activitives for Fuel Cell Applications.
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DOI：
10.1039/c2ee21156d
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发表时间：
2012-08-01
影响因子：
32.5
通讯作者：
Belcher AM
中科院分区：
文献类型：
--
作者：
Lee Y;Kim J;Yun DS;Nam YS;Shao-Horn Y;Belcher AM
利用表面活性剂介导的M13噬菌体与特异性Au结合肽的生物矿化反应，开发了一种简便的制备Au纳米线的方法。利用Au结合M13噬菌体与Au离子在水溶液中的选择性相互作用，在室温下合成了直径均匀的Au纳米线，产率大于98%，无需进行尺寸选择。Au纳米线的直径控制在10 nm ~ 50 nm之间。发现Au纳米线对所有尺寸的CO分子都具有电催化氧化活性，其中活性高度依赖于Au纳米线的表面刻面。这种低温高产率制备Au纳米线的方法被进一步扩展到具有受控的Pt壳层覆盖率的Au/Pt核/壳纳米线的合成。乙醇氧化与不同的Pt负载的电催化研究表明，相对于商业负载的Pt催化剂的活性增强，指示的双重功能的Pt的乙醇氧化和Au的抗中毒组分的Pt。这些具有可控成分的新型一维贵金属纳米线可以促进具有可调性能的新型合金材料的设计。
A facile synthetic route was developed to make Au nanowires (NWs) from surfactant-mediated bio-mineralization of a genetically engineered M13 phage with specific Au binding peptides. From the selective interaction between Au binding M13 phage and Au ions in aqueous solution, Au NWs with uniform diameter were synthesized at room temperature with yields greater than 98 % without the need for size selection. The diameters of Au NWs were controlled from 10 nm to 50 nm. The Au NWs were found to be active for electrocatalytic oxidation of CO molecules for all sizes, where the activity was highly dependent on the surface facets of Au NWs. This low-temperature high yield method of preparing Au NWs was further extended to the synthesis of Au/Pt core/shell NWs with controlled coverage of Pt shell layers. Electro-catalytic studies of ethanol oxidation with different Pt loading showed enhanced activity relative to a commercial supported Pt catalyst, indicative of the dual functionality of Pt for the ethanol oxidation and Au for the anti-poisoning component of Pt. These new one-dimensional noble metal NWs with controlled compositions could facilitate the design of new alloy materials with tunable properties.