The Role of Citric Acid in Perfecting Platinum Monolayer on Palladium Nanoparticles during the Surface Limited Redox Replacement Reaction
- Hong Kong Univ. of Science & Technology, Kowloon (Hong Kong). Dept. of Chemical and Biomolecular Engineering
- Chongqing Univ. (China). College of Chemistry and Chemical Engineering
- Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Chemistry
- Univ. of Houston, TX (United States). Dept. of Electrical and Computer Engineering
- National Supercomputing Center in Shenzhen, Guangdong (China)
Cu-mediated-Pt-displacement method that involves the displacement of an underpotentially deposited (UPD) Cu monolayer by Pt has been extensively studied to prepare core-shell catalysts. It has been found that Pt clusters instead of a uniform Pt monolayer were formed in the gram batch synthesis. With a suitable surfactant, such as citric acid, the Pt shell could be much more uniform. In this study, the role of citric acid in controlling the Cu-Pt displacement reaction kinetics was studied by electrochemical techniques and theoretical approaches. It was found that citric acid strongly adsorbed on Pd, Pt, Cu/Pd, and Pt/Pd surfaces, especially in the double layer region in acid solutions. The strong adsorption of citric acid slowed down the Cu-Pt displacement reaction. The main characteristics of such strong interaction most likely arises from the OH groups in the citric acid molecule according to the molecular dynamics simulation results.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0012704; AC02-98CH10886; 0955922
- OSTI ID:
- 1348291
- Report Number(s):
- BNL-113672-2017-JA; R&D Project: MA510MAEA; KC0302010
- Journal Information:
- Journal of the Electrochemical Society, Vol. 163, Issue 12; ISSN 0013-4651
- Publisher:
- The Electrochemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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