Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 259, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118079
Keywords
Piezoelectric polarization; Photoelectrochemical water splitting; Direct Z-scheme heterojunctions; ZnO; WO3-x
Funding
- National Natural Science Foundation of China [21506156, U1462119, 21676193]
- Tianjin Municipal Natural Science Foundation [16JCQNJC05200, 15JCZDJC37300]
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Photosynthesis with Z-scheme charge transfer has been recognized as an efficient pathway to achieve solarenergy conversion. Herein, the all-solid-state direct Z-scheme ZnO-WO3-x nanorod arrays were synthesized by insitu solvothermal treatment for highly piezoelectric (PE)-photoelectrochemical (PEC) water splitting. The chemical bonding between WO3-x and ZnO via W-O-Zn and the inherent band structures/Fermi levels drive the formation of direct Z-scheme charge-transfer pathway. Importantly, the optimized structure (Zn-W-5) shows higher PEC activities with high photocurrent density of 2.39 mA/cm(2) at 1.23 V vs. RHE, which is 2.13 times higher than pure ZnO. Surprisingly, the obvious PE polarization of ZnO increases its Fermi level toward conduction band and significantly enhances Z-scheme effect between ZnO and WO3-x. Especially, the best sample (Zn-W-5-1000 rpm) shows a photocurrent of 3.38 mA/cm(2) at 1.23 V vs. RHE, which is 3.02 times higher than pure ZnO. This work provides a facile PE polarization approach for enhancement of Z-scheme charge-transfer process.
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