Help Privacy Policy Disclaimer
  Advanced SearchBrowse




Journal Article

Novel mechanism of Fe4+/Ni3+ synergistic effect via exchange energy gain for boosting water oxidation


Hu,  Zhiwei
Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

External Resource
No external resources are shared
Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available

Fan, Y., Zhang, C., Zhang, L., Zhou, J., Li, Y., Huang, Y.-C., et al. (2024). Novel mechanism of Fe4+/Ni3+ synergistic effect via exchange energy gain for boosting water oxidation. Chem Catalysis, 4(5): 100981, pp. 1-3. doi:10.1016/j.checat.2024.100981.

Cite as: https://hdl.handle.net/21.11116/0000-000F-4701-0
Synergistic effects are often used for interpreting the enhanced electrochemical oxygen evolution reaction (OER) activity of catalysts with two or more elements. However, the mechanism behind this synergy remains ambiguous. Here, we report an Fe-doped Ni2Mo3O8 (Ni2?xFexMo3O8, where x = 0.1, 0.3, 0.5, 0.7, and 1.0) series with high OER activity (only 196 mV at 10 mA cm?2 for x = 0.5) and high stability over 200 h at a high current density of 500 mA cm?2. Our in situ X-ray absorption spectroscopies indicated a valence-state transition from Fe2+/Ni2+ to Fe3+(Fe4+)/Ni3+ and a structural transition from corner-sharing Fe(Ni)?O?Fe(Ni) to an edge-sharing network. The highest catalytic activity of Ni1.5Fe0.5Mo3O8 among this series is interpreted as a gain in the exchange energy (ca. 1 eV) of the Fe4+/Ni3+ pair facilitated by intersite hopping owing to its highest Fe valence state. Our results reveal a previously unreported mechanism for the Ni-Fe synergistic effect that enhances OER activity.