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Interaction between InP and SnO2 on TiO2 nanotubes for photoelectrocatalytic reduction of CO2

Zheng, Jingui, Hu, Fengyun, Han, Ershuan, Pan, Zhengbin, Zhang, Shuai, Li, Ya, Qin, Peiguang, Wang, Hui, Li, Peiqiang, Yin, Hongzong
Colloids and surfaces 2019 v.575 pp. 329-335
carbon dioxide, electron transfer, energy, hot water treatment, methanol, nanotubes, photocatalysis, tin dioxide, titanium dioxide
In this work, InP and SnO2 were assembled on TiO2 nanotubes (NTs) using a hydrothermal method with a different order to obtain InP/SnO2/TiO2 NTs and SnO2/InP/TiO2 NTs. The energy band gaps of SnO2/InP/TiO2 NTs (2.96 eV) is lower than that of InP/SnO2/TiO2 NTs (3.15 eV), And the net current densities of SnO2/InP/TiO2 NTs (1.1 mA cm−2) is higher than that of InP/SnO2/TiO2 NTs (0.27 mA cm−2) in photoelectrocatalytic reduction of CO2 process at −1.4 V (vs SCE), indicating SnO2/InP/TiO2 NTs has a better photoelectrocatalytic property than InP/SnO2/TiO2 NTs. Photoelectric conversion efficiency of SnO2/InP/TiO2 NTs was 23.52%, which was 2.38 times larger than that of InP/SnO2/TiO2 NTs (9.88%). Methanol as the main product was yielded at 3.16 mmol L−1 cm−2 and 2.54 mmol L−1cm−2 after 6h photoelectrocatalytic process on SnO2/InP/TiO2 NTs and InP/SnO2/TiO2 NTs, respectively, indicating better photoelectrocatalytic property of SnO2/InP/TiO2 NTs than InP/SnO2/TiO2 NT, which was further explained by electron transfer mechanism.