Department of Chemical Engineering, University of Wyoming , Laramie, Wyoming 82071, United States.
Center for Advanced Energy Studies, Idaho Falls, Idaho 83401, United States.
ACS Appl Mater Interfaces. 2017 Mar 22;9(11):9815-9822. doi: 10.1021/acsami.7b01217. Epub 2017 Mar 13.
We recently showed that phase-pure molybdenum carbide nanotubes can be durable supports for platinum (Pt) nanoparticles in hydrogen evolution reaction (HER). In this paper we further characterize surface properties of the same Pt/β-MoC catalyst platform using carbon monoxide (CO)-Pt and CO-MoC bond strength of different Pt particle sizes in the <3 nm range. Results from diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and temporal analysis of products (TAP) revealed the existence of different active sites as Pt particle size increases. Correlation between the resultant catalyst activity and deposited Pt particle size was further investigated using water-gas-shift (WGS) as a probe reaction, suggesting that precise control of particle diameter and thickness is needed for optimized catalytic activity.
我们最近表明，纯相碳化钼纳米管可以作为氢析出反应（HER）中铂（Pt）纳米粒子的耐用载体。在本文中，我们使用一氧化碳（CO）-Pt 和不同 Pt 粒径（<3nm）下的 CO-MoC 键强度，进一步对相同的 Pt/β-MoC 催化剂平台的表面特性进行了表征。漫反射红外傅里叶变换光谱（DRIFTS）和产物时间分辨分析（TAP）的结果表明，随着 Pt 粒径的增加，存在不同的活性位。通过水煤气变换（WGS）作为探针反应进一步研究了所得催化剂活性与沉积 Pt 粒径之间的相关性，表明需要精确控制粒径和厚度以实现最佳的催化活性。
