Brownmillerite‐type Ca2FeCoO5 (CFCO), whose crystal structure is categorized into an oxygen‐deficiency‐ordered perovskite, is one of the most effective catalysts for the oxygen evolution reaction (OER). Herein, CFCO is applied as a cocatalyst of WO3 for the oxygen photoevolution reaction under visible light illumination. CFCO is synthesized by a sol−gel method and calcination at 873 K and loaded on a WO3 electrode by an electrophoretic deposition method. The photocatalytic activity of WO3 for the oxygen photoevolution reaction is improved by loading an appropriate amount of CFCO to reach a close level of RuO2/WO3 and Co−Pi/WO3. Furthermore, photocorrosion of WO3 is suppressed by CFCO loading, leading to high stability. Because both the lower edge of the conduction band and the upper edge of the valence band of CFCO are higher than those of WO3, only photoexcited holes at WO3 move to CFCO and easily react with water on the CFCO surface, leading to acceleration of the OER and suppressing of photocorrosion of WO3.
Towards development of active and robust electrocatalysts for oxygen evolution reaction (OER) to realize water splitting and CO2 electroreduction by natural energies in practical conditions, brownmillerite-type composite oxide Ca2Fe2−xCoxO5 was...
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