期刊
ACS CATALYSIS
卷 11, 期 1, 页码 466-475出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.0c03330
关键词
platinum; single-atom catalyst; oxygen reduction reaction; active site; fuel cell
资金
- National Research Foundation of Korea Grant, Korean government (MSIT) [NRF-2019M3D1A1079297]
- Ministry of Trade, Industry, and Energy (MOTIE), Korea, under the Commercializing fuel cell electric vehicle component industry and R&D Support Program [P0000273]
- Korea Evaluation Institute of Industrial Technology (KEIT) [P0000273] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [PAL-2021, 4120200413631] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Efficient platinum single-atom (Pt-1) catalysts are sought after for reducing the costs of polymer electrolyte membrane (PEM) fuel cells. In this study, a Pt-based electrocatalyst was prepared by hydrothermal ethanol reduction method with high selectivity for the oxygen reduction pathway. Further reconstruction of the coordination environment led to the formation of highly efficient platinum single-atom active sites for oxygen reduction. The obtained catalyst demonstrated excellent performance and stability, outperforming commercial Pt/C by 8.7 times in mass activity at a cell voltage of 0.9 V.
Exploring highly efficient platinum single-atom (Pt-1) catalysts for oxygen reduction reaction (ORR) is desired to greatly reduce the catalysts costs of polymer electrolyte membrane (PEM) fuel cells. Herein, based on a nitrogen-doped active carbon (N-doped Black Pearl, NBP), an atomically dispersed Pt-based electrocatalyst is first prepared via a hydrothermal ethanol reduction method with Pt content of about 5 wt % (Pt-1/NBP), and it shows high selectivity for the two-electron oxygen reduction pathway. Through further high-temperature pyrolysis, the coordination environment of these isolated Pt atoms is reconstructed to form uniquely nitrogen-anchored platinum single-atom active sites (Pt-1@Pt/NBP) for a highly efficient four-electron oxygen reduction pathway. The obtained Pt-1@Pt/NBP catalyst presents excellent ORR performance and stability as well as fast ORR kinetics at a high potential region. As a cathode catalyst of a PEM fuel cell, Pt-1@Pt/NBP demonstrates 8.7 times higher mass activity than the commercial Pt/C at a cell voltage of 0.9 V.
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