Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 40, Pages 37322-37329Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b12537
Keywords
TiO2; SrTiO3; oxygen defect; heterojunction; synergism
Funding
- Natural Science Foundation of Jiangsu Province [BK20170550]
- National Natural Science Foundation of China [51702130, 61604062]
- Innovation/Entrepreneurship Program of Jiangsu Province
- project of Zhenjiang Key Laboratory of Advanced Sensing Materials and Devices [SS2018001]
- Jiangsu Specially-Appointed Professor Program
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Identifying effective means to improve the charge separation performance assisted by adequate surface reaction represents a significant challenge for developing a highly efficient TiO2 photoanode. Here we report a structural synergistic strategy between a close contact heterojunction and a surface oxygen vacancy to significantly boost the charge separation efficiency and charge injection efficiency of TiO2 nanowires (NWs) in PEC water splitting. To accomplish this task, a TiO2/SrTiO3 (TiO2/STO) heterojunction was first constructed by in situ conversion, resulting in close contact between interface, promoting separation of the photoinduced charge carriers, which increased charge separation efficiency by 107% compared to TiO2. After the amorphous layer established on the surface of the SrTiO3 coating, the resulting TiO2/SrTiO3/r-SrTiO3 (TiO2/STO/r-STO) improved the light absorption property of the photoelectrodes and boosted the ability to adsorb the reactant hydroxide ions, resulting in charge injection efficiency improvement by 67.3% compared with pure TiO2. This complementary modification for enhancing charge separation and boosting the surface reaction demonstrates a significant capacity to improve the photoelectrochemical (PEC) performance of one photoanode, which could be instructive for other fields including photocatalysis and PEC carbon dioxide reduction.
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