Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 11, Pages 9815-9822Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b01217
Keywords
platinum; molybdenum carbide; atomic layer deposition; strain-ligand effect; active sites; electronic structure
Funding
- Office of Research and Economic Development
- School of Energy Research (SER)
- NASA EPSCoR at the University of Wyoming
- U.S. Department of Energy, under DOE Idaho Operations Office [DE-AC07-05ID14517]
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We recently showed that phase-pure molybdenum carbide nanotubes can be durable supports for platinum (Pt) nanopartides in hydrogen evolution reaction (HER). In this paper we further characterize surface properties of the same Pt/beta-Mo2C catalyst platform using carbon monoxide (CO)-Pt and CO-Mo2C 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.
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