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Multi-shelled TiO2/Fe2TiO5 heterostructured hollow microspheres for enhanced solar water oxidation

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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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This project was kindly supported by the National Science Fund for Distinguished Young Scholars (No. 21325105), National Natural Science Foundation of China (Nos. 21590795, 51572261, 51472244, 51672274, 51661165013, 51372245, and 51672276), National Key Projects for Fundamental Research and Development of China (No. 2016YFB0600903), CAS Interdisciplinary Innovation Team, and Youth Innovation Promotion Association of CAS (No. 2017070). Muhammad Waqas thank the Chinese Academy of Sciences (CAS)-the World Academy of Sciences (TWAS) President’s Fellowship Programme and CAS-TWAS Postgraduate Fellowship for providing living allowance.

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Correspondence to Dan Mao or Bao Wang or Dan Wang.

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Waqas, M., Wei, Y., Mao, D. et al. Multi-shelled TiO2/Fe2TiO5 heterostructured hollow microspheres for enhanced solar water oxidation. Nano Res. 10, 3920–3928 (2017).

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  • multi-shelled hollow microsphere
  • titanium oxide
  • pseudo-brookite
  • heterostructure
  • photocatalytic water oxidation