期刊
CHEMICAL SCIENCE
卷 10, 期 21, 页码 5589-5595出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9sc01078e
关键词
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资金
- National Basic Research Program of China [2015CB932302]
- Natural Science Foundation of China [21890751, 91745113, 11621063, 21601172]
- National Program for Support of Topnotch Young Professionals
- Fundamental Research Funds for the Central Universities [WK 2060190084]
- Major/Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology
In this study, we report that optimal coordination-site exposure engineering in porous platinum brings ultrahigh activity and durability for the fuel cell oxygen reduction reaction (ORR). The porous platinum with numerous grain boundaries (GBP-Pt) consisting of 3nm crystals exhibits 7 times higher ORR activity than commercial Pt. For fuel-cell measurements, the GBP-Pt catalyst based MEA exhibits high power density (1.49 W cm(-2), 0.71 A mg(-1) Pt for mass activity) and stability (12.9% loss after 30 K cycles), all of which far surpass the U.S. DOE target in 2020 (0.44 A mg(-1) Pt for mass activity and 40% loss for stability). Density Functional Theory (DFT) calculation and X-ray Absorption Fine Structure (XAFS) results suggest that proper Pt coordination site exposure in grain boundaries provides optimal adsorption energies for oxygen species and high stability in the ORR, even superior to Pt(111) sites. We anticipated that coordination-site exposure engineering would open a new avenue to offer robust electrocatalysts for the fuel-cell oxygen reduction reaction.
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