Preparation and Structural Analysis of Carbon-Supported Co Core/Pt Shell Electrocatalysts Using Electroless Deposition Methods
Preparation and Structural Analysis of Carbon-Supported Co Core/Pt Shell Electrocatalysts Using Electroless Deposition Methods
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DOI：
10.1021/nn900214g
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发表时间：
2009-09-01
期刊：
影响因子：
17.1
通讯作者：
Monnier, John R.
中科院分区：
文献类型：
--
作者：
Beard, K. D.;Borrelli, David;Monnier, John R.
采用化学镀法（艾德）在碳载钴催化剂（Co/C）上制备了钴核/铂壳纳米粒子，并用高分辨透射电镜（HRTEM）进行了表征。对于2.0重量% Co/C核，艾德技术允许调节Pt负载以获得一系列具有不同数量的单层（ML）的Pt组合物。Co的腐蚀趋势和电化学（即，测量结构的氧还原反应（ORR）活性。程序升温还原（TPR）分析结果表明，在2.0%Co/C上Pt负载量为0.5 ~ 0.7%时，形成单一的Pt ML覆盖层。HRTEM分析表明，Co核上Pt壳的连续性取决于前体Co颗粒的尺寸，其中“大”Co颗粒（> 10 nm）有利于不连续的三维Pt结构，而“小”Co颗粒（
Cobalt core/platinum shell nanciparticles were prepared by the electroless deposition (ED) of Pt on carbon-supported cobalt catalyst (Co/C) and verified by HRTEM images. For a 2.0 wt % Co/C core, the ED technique permitted the Pt loading to be adjusted to obtain a series of bimetallic compositions with varying numbers of monolayers (ML). The tendency for corrosion of Co and the electrochemical (i.e., oxygen reduction reaction (ORR)) activity of the structures were measured. The results from temperature-programmed reduction (TPR) analysis suggest that a single Pt ML coverage is formed at a Pt weight loading between 0.5 and 0.7% on the 2.0% Co/C. HRTEM analysis indicates that the continuity of the Pt shell on the Co core depends on the precursor Co particle size, where "large" Co particles (> 10 nm) favor noncontinuous, three-dimensional Pt structures and "small" Co particles (