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Journal of Materials Science: Materials in Electronics

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14-05-2020 | Review

TiO₂ nanocrystalline for enhanced hydrogen and oxygen generation of thin film photocatalyst: from catalytic mechanism and microstructural analysis

Authors: Chang Bian, Wenshu Yang, Guijie Zhu, Shuang Feng, Jiejing Zhang, Ri Xu, Xinxin Zhang, Wuyou Fu, Haibin Yang

Published in: Journal of Materials Science: Materials in Electronics | Issue 13/2020

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Abstract

Anatase TiO₂ nanocrystalline film prepared by using sol–gel method was assembled on TiO₂ nanotubes to produce composite thin film photocatalyst and investigated as interfacial layer for the catalytic performance of Ti/TNT/N–P/NaTaO₃:La (the nanostructures is Ti/TiO₂ nanotubes/TiO₂ nanocrystalline film/NiO film/NaTaO₃:La) photocatalyst to generate hydrogen and oxygen under UV irradiation. The as-synthesized samples were characterized by FESEM, XRD, Element Mapping, UV–Vis, PL, I–V, and EIS. Characteristic analyses show that the interface between the TNT layer (TiO₂ nanotubes) and P layer (NiO film) can be optimized by adjusting the number of N layers (TiO₂ nanocrystalline film), thus affecting the efficiency of the photocatalyst. Compared with unformed TiO₂ film, the Ti/TNT/N–P/NaTaO₃:La photocatalyst with four TiO₂ layers enhanced the H₂ and O₂ generation rate from 43.7 to 87.1 μmol/h which realized almost 2.0 times. The enhanced photocatalytic performance can be attributed to the low defect density and the effective separation of photo-generated electron–hole pairs. Furthermore, the performance stability of thin film photocatalyst was favorably showcased through multiple water splitting reactions, and the rational mechanism of improved photocatalytic property was interpreted systematically. In summary, such results have certain guiding effect on solving the weakness of composite film catalyst of interface defects and carrier recombination.

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Title: TiO2 nanocrystalline for enhanced hydrogen and oxygen generation of thin film photocatalyst: from catalytic mechanism and microstructural analysis
Authors: Chang Bian
Wenshu Yang
Guijie Zhu
Shuang Feng
Jiejing Zhang
Ri Xu
Xinxin Zhang
Wuyou Fu
Haibin Yang
Publication date: 14-05-2020
Publisher: Springer US
Published in: Journal of Materials Science: Materials in Electronics / Issue 13/2020
Print ISSN: 0957-4522
Electronic ISSN: 1573-482X
DOI: https://doi.org/10.1007/s10854-020-03576-4

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