Abstract
Nickel-iron mixed metal oxyhydroxides have attracted significant attention as an oxygen evolution reaction (OER) catalyst for solar fuel renewable energy applications. Here, we performed surface-selective and time-dependent redox titrations to directly measure the surface OER kinetics of NiIV and FeIV in NiOOH, FeOOH, and Ni1-xFexOOH (0 < x < 0.27) electrodes. Most importantly, two types of surface sites exhibiting "fast" and "slow" kinetics were found, where the fraction of "fast" sites in Ni1-xFexOOH matched the iron atom content in the film. This finding provides experimental support to the theory-proposed model of active sites in Ni1-xFexOOH. The OER rate constant of the "fast" site was 1.70 s-1 per atom.
Original language | English |
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Pages (from-to) | 313-318 |
Number of pages | 6 |
Journal | Journal of the American Chemical Society |
Volume | 138 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2016 Jan 13 |
Bibliographical note
Publisher Copyright:© 2015 American Chemical Society.
All Science Journal Classification (ASJC) codes
- Catalysis
- Chemistry(all)
- Biochemistry
- Colloid and Surface Chemistry