Platinum-Monolayer Shell on AuNi0.5Fe Nanoparticle Core Electrocatalyst with High Activity and Stability for the Oxygen Reduction Reaction
Platinum-Monolayer Shell on AuNi0.5Fe Nanoparticle Core Electrocatalyst with High Activity and Stability for the Oxygen Reduction Reaction
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DOI：
10.1021/ja1063873
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发表时间：
2010-10-20
影响因子：
15
通讯作者：
Adzic, Radoslav R.
中科院分区：
文献类型：
--
作者：
Gong, Kuanping;Su, Dong;Adzic, Radoslav R.
我们描述了一种简单的方法，通过原位分解相应的普鲁士蓝类似物，这是吸附在炭黑上制备多金属纳米粒子。该实施例涉及用于氧还原反应的Pt-ML/Au1Ni0.5Fe核-壳电催化剂的AuNi0.5Fe核。该核含有3-5个表面原子层的Au，其在决定催化剂的活性和稳定性方面起着至关重要的作用。Pt-ML/AuNi_（0.5）Fe电催化剂的Pt质量和比活性分别为1.38 A/mg（Pt）和1.12 × 10 ~（-3）A/cm（Pt）（2），均比商业Pt/C催化剂高出数倍。其全贵金属质量活度（0.18 A/mg（Pt，Au））高于或相当于商业样品。稳定性测试表明，在15000个三角电位循环后，活性的损失微不足道。我们归因于高的活性和稳定性的Pt-ML/AuNi 0. 5 Fe电催化剂，其分级结构的性能，Pt的核心相互作用，和高的电化学稳定性的金壳，排除暴露于电解质的相对活性的内核材料。
We describe a simple method for preparing multimetallic nanoparticles by in situ decomposition of the corresponding Prussian blue analogue, which is adsorbed on carbon black. The example involves the AuNi0.5Fe core of the Pt-ML/Au1Ni0.5Fe core-shell electrocatalyst for the oxygen reduction reaction. The core contains 3-5 surface atomic layers of Au, which play an essential role in determining the activity and stability of the catalyst. The Pt-ML/AuNi0.5Fe electrocatalyst exhibited Pt mass and specific activities of 1.38 A/mg(Pt) and 1.12 x 10(-3) A/cm(Pt)(2), respectively, both of which are several times higher than those of commercial Pt/C catalysts. Its all-noble-metal mass activity (0.18 A/mg(Pt,Au)) is higher than or comparable to those of commercial samples. Stability tests showed an insignificant loss in activity after 15 000 triangular-potential cycles. We ascribe the high activity and stability of the Pt-ML/AuNi0.5Fe electrocatalyst to its hierarchical structural properties, the Pt-core interaction, and the high electrochemical stability of the gold shell that precludes exposure to the electrolyte of the relatively active inner-core materials.