Two-dimensional lateral anatase-rutile TiO2 phase junctions with oxygen vacancies for robust photoelectrochemical water splitting

[Display omitted] Exploiting the photoelectrode materials with broad solar light response, high-efficient separation of photogenerated charges and abundant active sites is extremely vital yet enormously challenging. Herein, an innovative two-dimensional (2D) lateral anatase-rutile TiO2 phase junctio...

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Published in:Journal of colloid and interface science 2023-10, Vol.648, p.56-65
Main Authors: Meng, Ming, Yang, Lun, Yang, Jing, Zhu, Yu, Li, Chunyang, Xia, Hongjun, Yuan, Honglei, Zhang, Meng, Zhao, You, Tian, Fengshou, Li, Jitao, Liu, Kuili, Wang, Lei, Gan, Zhixing
Format: Article
Language:English
Subjects:
2D lateral phase junctions
Oxygen vacancies
Photoelectrochemical water splitting
TiO2 nanosheets
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Summary:[Display omitted] Exploiting the photoelectrode materials with broad solar light response, high-efficient separation of photogenerated charges and abundant active sites is extremely vital yet enormously challenging. Herein, an innovative two-dimensional (2D) lateral anatase-rutile TiO2 phase junctions with controllable oxygen vacancies perpendicularly aligned on Ti mesh is presented. Our experimental observations and theoretical calculations corroborate explicitly that the 2D lateral phase junctions together with three-dimensional arrays not only exhibit the high-efficient photogenerated charges separation guaranteed by the build-in electric field at the side-to-side interface, but also furnish enriching active sites. Moreover, the interfacial oxygen vacancies generate new defect energy levels and serve as electron donors, hence extending visible light response and further accelerating the separation and transfer of photogenerated charges. Profiting from these merits, the optimized photoelectrode yield a pronounced photocurrent density of 1.2 mA/cm2 at 1.23 V vs. RHE with Faradic efficiency of 100%, which is approximately 2.4 times larger than that of pristine 2D TiO2 nanosheets. Furthermore, the incident photon to current conversion efficiency (IPCE) of the optimized photoelectrode is also boosted within both ultraviolet and visible light regions. This research is envisioned deliver the new insight in developing the novel 2D lateral phase junctions for PEC applications.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2023.05.193