Silicon Oxide-Encapsulated Platinum Thin Films as Highly Active Electrocatalysts for Carbon Monoxide and Methanol Oxidation
Silicon Oxide-Encapsulated Platinum Thin Films as Highly Active Electrocatalysts for Carbon Monoxide and Methanol Oxidation
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DOI：
10.1021/acscatal.8b03626
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发表时间：
2018-10
期刊：
影响因子：
12.9
通讯作者：
Jacob Robinson;N. Labrador;Han Chen;B. E. Sartor;D. Esposito
中科院分区：
文献类型：
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作者：
Jacob Robinson;N. Labrador;Han Chen;B. E. Sartor;D. Esposito
直接醇燃料电池（DAFC）具有为运输和便携式应用提供高功率密度的潜力。然而，DAFC的广泛使用受到缺乏阳极电催化剂的极大阻碍，所述阳极电催化剂是廉价的、稳定的、抗CO中毒的并且对醇氧化具有高活性。克服这些挑战的一种有希望的方法是将联合收割机过渡金属催化剂与氧化物载体如SiO2组合，已知其通过促进CO在氧化物上的氧化来增强醇氧化|金属界面区域通过所谓的双功能机制。本文中，我们报道了一种用于醇氧化的膜涂覆电催化剂（MCEC）结构，其中薄的可渗透的氧化硅（SiOx）纳米膜封装了定义明确的Pt薄膜（SiOx| Pt）。与氧化物支撑的纳米颗粒相比，MCEC设计的一个关键优势是氧化物封装使氧化物的密度最大化。|SiOx和Pt催化剂之间的金属界面位点。A seri.
Direct alcohol fuel cells (DAFCs) have the potential to provide high power densities for transportation and portable applications. However, widespread use of DAFCs is greatly hindered by the lack of anode electrocatalysts that are inexpensive, stable, resistant to CO poisoning, and highly active toward alcohol oxidation. One promising approach to overcoming these challenges is to combine transition metal catalysts with oxide supports, such as SiO2, which are known to enhance alcohol oxidation by promoting CO oxidation at oxide|metal interfacial regions through the so-called bifunctional mechanism. Herein, we report on a membrane-coated electrocatalyst (MCEC) architecture for alcohol oxidation, in which a thin, permeable silicon oxide (SiOx) nanomembrane encapsulates a well-defined Pt thin film (SiOx|Pt). A key advantage of the MCEC design compared to oxide-supported nanoparticles is that the oxide encapsulation maximizes the density of oxide|metal interfacial sites between the SiOx and Pt catalyst. A seri...