4.6 Article

Defect Engineering and Surface Polarization of TiO2 Nanorod Arrays toward Efficient Photoelectrochemical Oxygen Evolution

期刊

CATALYSTS
卷 12, 期 9, 页码 -

出版社

MDPI
DOI: 10.3390/catal12091021

关键词

titanium dioxide; defect engineering; surface polarization; photoelectrochemical water splitting

资金

  1. National Natural Science Foundation of China [52272239]
  2. Fundamental Research Program of Qinghai Province [2021-ZJ-941Q]
  3. Youth Research Foundation Project of Qinghai University [2020-QGY-5]
  4. Fundamental Research Funds for the Central Universities [D5000210894]

向作者/读者索取更多资源

This study demonstrates a surface treatment strategy to enhance the performance of TiO2-x nanorod arrays for photoelectrochemical water splitting, achieving high photocurrent density and efficient charge separation.
The relatively low photo-conversion efficiencies of semiconductors greatly restrict their real-world practices toward photoelectrochemical water splitting. In this work, we demonstrate the fabrication of TiO2-x nanorod arrays enriched with oxygen defects and surface-polarized hydroxyl groups by a facile surface reduction method. The oxygen defects located in the bulk/surface of TiO2-x enable fast charge transport and act as catalytically active sites to accelerate the water oxidation kinetics. Meanwhile, the hydroxyl groups could establish a surface electric field by polarization, for efficient charge separation. The as-optimized TiO2-x nanorod photoanode achieves a high photocurrent density of 2.62 mA cm(-2) without any cocatalyst loading at 1.23 V-RHE under 100 mW cm(-2), which is almost double that of the bare TiO2 counterpart. Notably, the surface charge separation and injection efficiency of the TiO2-x photoanode reach as high as 80% and 97% at 1.23 V-RHE, respectively, and the maximum incident photon-to-current efficiency reaches 90% at 400 nm. This work provides a new surface treatment strategy for the development of high-performance photoanodes in photoelectrochemical water splitting.

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