Journal
ACS ENERGY LETTERS
Volume 5, Issue 12, Pages 3672-3680Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c01959
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Funding
- Office of Naval Research [N000141812155]
- Collaborative Innovation Center of Suzhou Nano Science Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project
- Joint Center for Artificial Photosynthesis, a DOE Energy Innovation Hub through the Office of Science of the U.S. Department of Energy [DE-SC0004993]
- National Science Foundation [CBET 1159240, DMR1420620, DMR-1506535, ACI-1548562]
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Hydrogen evolution reaction (HER) is a key reaction in hydrogen production through water electrolysis. Platinum (Pt) is the best-known element for HER catalysis. Due to the scarcity of Pt, the development of non-Pt nanocatalysts is desired to achieve broad scale implementations. Here we demonstrate that the PdCu nanostructure containing an intermetallic B2 phase (PdCu-B2) shows a smaller Tafel slope, higher exchange current density, and lower overpotential for HER compared to commercial Pt/C in acidic conditions. Density functional theory (DFT) calculations demonstrate that the improved HER performance in acidic conditions can be attributed to the decrease in the hydrogen binding energy (HBE) on the compressed intermetallic PdCu-B2, shifting the HBE to a more optimal position even compared to Pt/C. In addition, PdCu-B2 exhibits the highest mass activity toward the formic acid oxidation reaction, making it a good anode catalyst candidate for formic-acid-based fuel cells.
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