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Construction of Photothermo-Electro Coupling Field Based on Surface Modification of Hydrogenated TiO2Nanotube Array Photoanode and Its Improved Photoelectrochemical Water Splitting

Authors :
Li, Fei
Dong, Bo
Yu, Lintao
Jin, Xiaoli
Huang, Qunzeng
Source :
Inorganic Chemistry; January 2024, Vol. 63 Issue: 2 p1175-1187, 13p
Publication Year :
2024

Abstract

Solar water splitting has gained increasing attention in converting solar energy into green hydrogen energy. However, the construction of a photothermo-electro coupling field by harnessing light-induced heat and its enhancement on solar water splitting were seldom studied. Herein, we developed a full-spectrum responsive photoanode by depositing CdxZn1–xS onto the surface of hydrogenated TiO2nanotube array (H-TNA), followed by modification with Ni2P. The resulting ternary photoanode exhibits a photocurrent density of 4.99 mA·cm–2at 1.23 V vs. RHE with photoinduced heating, which is 11.9-fold higher than that of pristine TNA, with an optimal ABPE of 2.47%. The characterization results demonstrate that the ternary photoanode possesses superior full-spectrum absorption and efficient photogenerated carrier separation driven by the interface electric fields. Additionally, Ni2P reduces the hole injection barrier and increases surface active sites, accelerating the consumption of holes accumulating on the relatively unstable CdxZn1–xS to simultaneously improve the activity and stability of water splitting. Moreover, temperature-dependent measurements reveal that H-TNA and Ni2P significantly motivate the photothermal conversion to construct a photothermo-electro coupling field, optimizing photoelectric conversion and charge carrier-induced surface reactions. This work contributes to understanding the synergistic effect of the photothermo-electro coupling field on the photoelectrochemical water splitting.

Details

Language :
English
ISSN :
00201669 and 1520510X
Volume :
63
Issue :
2
Database :
Supplemental Index
Journal :
Inorganic Chemistry
Publication Type :
Periodical
Accession number :
ejs65070344
Full Text :
https://doi.org/10.1021/acs.inorgchem.3c03604