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Systematic Study of Oxygen Evolution Activity and Stability on La1–xSrxFeO3−δ Perovskite Electrocatalysts in Alkaline Media
journal contribution
posted on 2018-03-16, 00:00 authored by Sixuan She, Jie Yu, Wanqi Tang, Yinlong Zhu, Yubo Chen, Jaka Sunarso, Wei Zhou, Zongping ShaoPerovskite
oxide is an attractive low-cost alternative catalyst
for oxygen evolution reaction (OER) relative to the precious metal
oxide-based electrocatalysts (IrO2 and RuO2).
In this work, a series of Sr-doped La-based perovskite oxide catalysts
with compositions of La1–xSrxFeO3−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 LaFeO3−δ (LF), La0.8Sr0.2FeO3−δ (LSF-0.2), La0.5Sr0.5FeO3−δ (LSF-0.5), SrFeO3−δ (SF), and La0.2Sr0.8FeO3−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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surface Fe oxidation statessurface oxygen vacanciesRuO 2metal oxide-based electrocatalystsAlkaline Media Perovskite oxidesolution increasewater oxidationOxygen Evolution ActivityOER-specific activitiesalternative catalystoxygen evolution reactionSr-doped La-based perovskite oxide catalystsFeOLSF -0.8bulk stoichiometric compositionsOER performance stabilitysurface LaIrO 2crystal structureSystematic StudyLFsurface performance relations
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