Pt monolayer coating on complex network substrate with high catalytic activity for the hydrogen evolution reaction.
Pt monolayer coating on complex network substrate with high catalytic activity for the hydrogen evolution reaction.
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DOI：
10.1126/sciadv.1400268
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发表时间：
2015-09
期刊：
影响因子：
13.6
通讯作者：
Liu SF
中科院分区：
文献类型：
--
作者：
Li M;Ma Q;Zi W;Liu X;Zhu X;Liu SF
采用缓冲层（Ag或Au）的沉积方法在大表面积三维泡沫镍基体上制备了完整的单层铂涂层。石英晶体微天平，电流密度分析，循环伏安积分，和X射线光电子能谱的结果表明，单层沉积过程实现了在衬底上的全覆盖和沉积可以控制到一个单一的原子层的厚度。据我们所知，这是第一次报告的完整单层Pt涂层的三维散装基板上具有复杂的精细结构，所有以前的文献报道亚单层或不完整的单层涂层。发现Ag或Au的薄底层是必要的，以覆盖非常反应性的Ni衬底，以确保完整的单层Pt覆盖;否则，仅形成不完整的单层。此外，发现Pt单层以及厚Pt膜用于催化反应。这一发展可能为以最少的Pt用量制备高活性Pt催化剂铺平了道路。
A deposition process has been developed to fabricate a complete-monolayer Pt coating on a large-surface-area three-dimensional (3D) Ni foam substrate using a buffer layer (Ag or Au) strategy. The quartz crystal microbalance, current density analysis, cyclic voltammetry integration, and X-ray photoelectron spectroscopy results show that the monolayer deposition process accomplishes full coverage on the substrate and the deposition can be controlled to a single atomic layer thickness. To our knowledge, this is the first report on a complete-monolayer Pt coating on a 3D bulk substrate with complex fine structures; all prior literature reported on submonolayer or incomplete-monolayer coating. A thin underlayer of Ag or Au is found to be necessary to cover a very reactive Ni substrate to ensure complete-monolayer Pt coverage; otherwise, only an incomplete monolayer is formed. Moreover, the Pt monolayer is found to work as well as a thick Pt film for catalytic reactions. This development may pave a way to fabricating a high-activity Pt catalyst with minimal Pt usage.