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Spectroscopic Characterization of Mixed Fe–Ni Oxide Electrocatalysts for the Oxygen Evolution Reaction in Alkaline Electrolytes
Abstract
Mixed Fe–Ni oxide electrocatalysts for the oxygen evolution reaction in alkaline electrolytes were synthesized using three different approaches: evaporation induced self-assembly, hard templating, and dip-coating. For each synthesis method, a peak in oxygen evolution activity was observed near 10 mol % Fe content, where the mixed metal oxide was substantially more active than the parent metal oxide electrocatalysts. X-ray diffraction (XRD) analysis showed the formation of a mixed NiO/NiFe 2 O 4 phase at low Fe concentrations, and formation of Fe 2 O 3 at compositions above 25 mol % Fe. Raman vibrational spectroscopy confirmed the formation of NiFe 2 O 4, and did not detect Fe 2 O 3 in the electrocatalysts containing up to 20 mol % Fe. X-ray absorption near edge structure (XANES) showed the Fe in the mixed oxides to be predominantly in the +3 oxidation state. Extended X-ray absorption fine structure (EXAFS) showed changes in the Fe coordination shells under electrochemical oxygen evolution conditions. Temperature programmed reaction spectroscopy showed the mixed oxide surfaces also have superior oxidation activity for methanol oxidation, and that the reactivity of the mixed oxide surface is substantially different than that of the parent metal oxide surfaces. Overall, the NiFe 2 O 4 phase is implicated in having a significant role in improving the oxygen evolution activity of the mixed metal oxide systems.
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Metadata
- Authors
- Landon, J., Demeter, E., İnoğlu, N., Keturakis, C., Wachs, I. E., Vasić, R., Frenkel, A. I., & Kitchin, J. R.
- Venue
- ACS Catalysis
- Publisher
- American Chemical Society (ACS)
- Published
- 2012-07-24
- Volume
- 2
- Issue
- 8
- Pages
- 1793-1801
- ISSN
- 2155-5435 (ISSN-L)
- OpenAlex
- W1999912925
- Cited by
- 496
- References
- 2
- FWCI
- 9.72
- Type
- journal article
- Language
- en
- Open access
- closed
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