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Title: Palladium-platinum core-shell electrocatalysts for oxygen reduction reaction prepared with the assistance of citric acid

Journal Article · · ACS Catalysis
 [1];  [2];  [1];  [1];  [1];  [3];  [1]
  1. The Hong Kong Univ. of Science and Technology, Kowloon (Hong Kong)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. National Supercomputing Center in Shenzhen, Guangdong (People's Republic of China)

Core–shell structure is a promising alternative to solid platinum (Pt) nanoparticles as electrocatalyst for oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs). A simple method of preparing palladium (Pd)–platinum (Pt) core–shell catalysts (Pd@Pt/C) in a gram-batch was developed with the assistance of citric acid. The Pt shell deposition involves three different pathways: galvanic displacement reaction between Pd atoms and Pt cations, chemical reduction by citric acid, and reduction by negative charges on Pd surfaces. The uniform ultrathin (~0.4 nm) Pt shell was characterized by in situ X-ray diffraction (XRD) and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) images combined with electron energy loss spectroscopy (EELS). Compared with state-of-the-art Pt/C, the Pd@Pt/C core–shell catalyst showed 4 times higher Pt mass activity and much better durability upon potential cycling. As a result, both the mass activity and durability were comparable to that of Pd@Pt/C synthesized by a Cu-mediated-Pt-displacement method, which is more complicated and difficult for mass production.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC00112704
OSTI ID:
1257947
Report Number(s):
BNL-112220-2016-JA; R&D Project: 16060; KC0403020
Journal Information:
ACS Catalysis, Vol. 6, Issue 6; ISSN 2155-5435
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 41 works
Citation information provided by
Web of Science

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