Palladium-platinum core-shell electrocatalysts for oxygen reduction reaction prepared with the assistance of citric acid
- The Hong Kong Univ. of Science and Technology, Kowloon (Hong Kong)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- 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 Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- OSTI ID:
- 1257947
- Alternate ID(s):
- OSTI ID: 1354475
- Report Number(s):
- BNL--112220-2016-JA; KC0403020
- Journal Information:
- ACS Catalysis, Journal Name: ACS Catalysis Journal Issue: 6 Vol. 6; ISSN 2155-5435
- Country of Publication:
- United States
- Language:
- English
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