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Systematic Study of Oxygen Evolution Activity and Stability on La1–xSrxFeO3−δ Perovskite Electrocatalysts in Alkaline Media
Abstract
Perovskite oxide is an attractive low-cost alternative catalyst for oxygen evolution reaction (OER) relative to the precious metal oxide-based electrocatalysts (IrO 2 and RuO 2 ). In this work, a series of Sr-doped La-based perovskite oxide catalysts with compositions of La 1– x Sr x FeO 3−δ ( x = 0, 0.2, 0.5, 0.8, and 1) are synthesized and characterized. The OER-specific activities in alkaline solution increase in the order of LaFeO 3−δ (LF), La 0.8 Sr 0.2 FeO 3−δ (LSF-0.2), La 0.5 Sr 0.5 FeO 3−δ (LSF-0.5), SrFeO 3−δ (SF), and La 0.2 Sr 0.8 FeO 3−δ (LSF-0.8). We establish a direct correlation between the enhancement in the specific activity and the amount of surface oxygen vacancies as well as the surface Fe oxidation states. The improved specific activity for LSF-0.8 is clearly linked to the optimum amount of surface oxygen vacancies and surface Fe oxidation states. We also find that the OER performance stability is a function of the crystal structure and the deviation in the surface La and/or Sr composition(s) from their bulk stoichiometric compositions. The cubic structure and lower deviation, as is the case for LSF-0.8, led to a higher OER performance stability. These surface performance relations provide a promising guideline for constructing efficient water oxidation.
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Metadata
- Authors
- She, S., Yu, J., Tang, W., Zhu, Y., Chen, Y., Sunarso, J., Zhou, W., & Shao, Z.
- Venue
- ACS Applied Materials & Interfaces
- Publisher
- American Chemical Society (ACS)
- Published
- 2018-03-16
- Volume
- 10
- Issue
- 14
- Pages
- 11715-11721
- ISSN
- 1944-8244 (ISSN-L)
- 1944-8252
- OpenAlex
- W2791691577
- Cited by
- 258
- References
- 36
- FWCI
- 5.32
- Type
- journal article
- Language
- en
- Open access
- closed
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