Abstract
There remains a pressing challenge in the fabrication of superior photocatalysts for light-driven water oxidation. Here, we designed and fabricated heterostructured TiO2/Fe2TiO5 hollow microspheres with single-, double-, closed-double-, triple-, and core–shell structures and different Fe/Ti molar ratios using a facile sequential templating approach. The closed-double-shelled TiO2/Fe2TiO5 hollow microspheres with 35% Fe exhibited the highest oxygen evolution reaction rate up to 375 μmol·g−1·h−1 and good stability for 5 h. The high performance can be attributed to the closed-double shell, which had more reactive sites and greater light-harvesting ability, self-supported thin shells with short charge-transfer paths, and a favorable staggered band alignment between the TiO2 and Fe2TiO5.
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