期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 115, 期 23, 页码 5872-5877出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1722034115
关键词
density functional theory; B3PW91; PBE; electrocatalysis; reaction mechanism
资金
- Joint Center for Artificial Photosynthesis, a Department of Energy (DOE) Energy Innovation Hub through the Office of Science of the DOE [DE-SC0004993]
- National Science Foundation [ACI-1053575]
- Zwicky Astrophysics Supercomputer at Caltech
The oxygen evolution reaction (OER) is critical to solar production of fuels, but the reaction mechanism underlying the performance for a best OER catalyst, Fe-doped NiOOH [(Ni, Fe)OOH], remains highly controversial. We used grand canonical quantum mechanics to predict the OER mechanisms including kinetics and thus overpotentials as a function of Fe content in (Ni, Fe) OOH catalysts. We find that density functional theory (DFT) without exact exchange predicts that addition of Fe does not reduce the overpotential much. However, DFT with exact exchange predicts dramatic improvement in performance for (Ni, Fe) OOH, leading to an overpotential of 0.42 V and a Tafel slope of 23 mV/decade (dec), in good agreement with experiments, 0.3-0.4 V and 30 mV/dec. We reveal that the high spin d(4) Fe(IV) leads to efficient formation of an active O radical intermediate, while the closed shell d(6) Ni(IV) catalyzes the subsequent O-O coupling, and thus it is the synergy between Fe and Ni that delivers the optimal performance for OER.
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