The Role of Citric Acid in Perfecting Platinum Monolayer on Palladium Nanoparticles during the Surface Limited Redox Replacement Reaction

Zhu, Shangqian; Yue, Jeffrey; Qin, Xueping; Wei, Zidong; Liang, Zhixiu; Adzic, Radoslav R.; Brankovic, Stanko R.; Du, Zheng; Shao, Minhua

doi:10.1149/2.0061612jes

Title: The Role of Citric Acid in Perfecting Platinum Monolayer on Palladium Nanoparticles during the Surface Limited Redox Replacement Reaction

Journal Article · Thu Jul 28 00:00:00 EDT 2016 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/2.0061612jes· OSTI ID:1348291

Zhu, Shangqian ^[1]; Yue, Jeffrey ^[1]; Qin, Xueping ^[1]; Wei, Zidong ^[2]; Liang, Zhixiu ^[3]; Adzic, Radoslav R. ^[3]; Brankovic, Stanko R. ^[4]; Du, Zheng ^[5]; Shao, Minhua ^[1]

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.

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Research Organization:: Brookhaven National Lab. (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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Cited by: 16 works

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