Palladium-platinum core-shell electrocatalysts for oxygen reduction reaction prepared with the assistance of citric acid
Abstract
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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1257947
- Report Number(s):
- BNL-112220-2016-JA
Journal ID: ISSN 2155-5435; R&D Project: 16060; KC0403020
- Grant/Contract Number:
- SC00112704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ACS Catalysis
- Additional Journal Information:
- Journal Volume: 6; Journal Issue: 6; Journal ID: ISSN 2155-5435
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 29 ENERGY PLANNING, POLICY, AND ECONOMY; electrocatalysis; fuel cells; underpotential deposition; synchrotron; durability; Center for Functional Nanomaterials
Citation Formats
Zhang, Lulu, Su, Dong, Zhu, Shangqian, Chang, Qiaowan, Yue, Jeffrey, Du, Zheng, and Shao, Minhua. Palladium-platinum core-shell electrocatalysts for oxygen reduction reaction prepared with the assistance of citric acid. United States: N. p., 2016.
Web. doi:10.1021/acscatal.6b00517.
Zhang, Lulu, Su, Dong, Zhu, Shangqian, Chang, Qiaowan, Yue, Jeffrey, Du, Zheng, & Shao, Minhua. Palladium-platinum core-shell electrocatalysts for oxygen reduction reaction prepared with the assistance of citric acid. United States. https://doi.org/10.1021/acscatal.6b00517
Zhang, Lulu, Su, Dong, Zhu, Shangqian, Chang, Qiaowan, Yue, Jeffrey, Du, Zheng, and Shao, Minhua. Tue .
"Palladium-platinum core-shell electrocatalysts for oxygen reduction reaction prepared with the assistance of citric acid". United States. https://doi.org/10.1021/acscatal.6b00517. https://www.osti.gov/servlets/purl/1257947.
@article{osti_1257947,
title = {Palladium-platinum core-shell electrocatalysts for oxygen reduction reaction prepared with the assistance of citric acid},
author = {Zhang, Lulu and Su, Dong and Zhu, Shangqian and Chang, Qiaowan and Yue, Jeffrey and Du, Zheng and Shao, Minhua},
abstractNote = {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.},
doi = {10.1021/acscatal.6b00517},
journal = {ACS Catalysis},
number = 6,
volume = 6,
place = {United States},
year = {Tue Apr 26 00:00:00 EDT 2016},
month = {Tue Apr 26 00:00:00 EDT 2016}
}
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