Journal of Physical Chemistry C
Journal of Physical Chemistry C
5 years ago

Vertically Aligned Core–Shell PbTiO3@TiO2 Heterojunction Nanotube Array for Photoelectrochemical and Photocatalytic Applications

Vertically Aligned Core–Shell PbTiO3@TiO2 Heterojunction Nanotube Array for Photoelectrochemical and Photocatalytic Applications
Jang-Hee Yoon, Hyun Gyu Kim, Byoung-Seob Lee, Sung Sik Won, Jae Sung Lee, Ju Hun Kim, Chang Won Ahn, Wonyong Choi, Jum Suk Jang
Vertically aligned core–shell PbTiO3@TiO2 heterojunction nanotube arrays are fabricated on F:SnO2 (FTO) glass substrate via a unique three-step process: an electron beam vapor deposition of Ti thin film on FTO, anodic oxidation of the Ti film to TiO2 nanotubes, and finally formation of PbTiO3 perovskite layer at the inner wall of the TiO2 nanotubes. The PbTiO3@TiO2 nanotube array exhibits dramatically improved photoactivity relative to TiO2 nanotubes or PbTiO3/TiO2 composite powders in photoelectrochemical water splitting and photocatalytic isopropyl alcohol decomposition under visible light irradiation (>420 nm). In the core–shell heterojunction electrodes, PbTiO3 serves as a visible light responsive inorganic photosensitizer with its small band gap and forms a heterojunction with TiO2 for effective charge separation.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b03081

DOI: 10.1021/acs.jpcc.7b03081

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