Journal
RSC ADVANCES
Volume 13, Issue 1, Pages 575-580Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ra06301h
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Funding
- JSPS KAKENHI [18K19046, 19H02661, 22K19000]
- KEIRIN RACE
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The PEC properties of ZnTe-based photocathodes with various structures were investigated, and it was found that samples with heterostructures showed better performance than those without heterojunctions. In particular, the n-ZnS/ZnTe/p-ZnTe sample exhibited excellent performance even at low applied potential in the presence of Eu3+ ions.
Photoelectrochemical (PEC) properties of ZnTe-based photocathodes with various structures were investigated to clarify the effective structure for the water reduction reaction. Samples with n-ZnO/ZnTe/p-ZnTe and n-ZnS/ZnTe/p-ZnTe heterostructures showed superior PCE properties to the samples without a heterojunction. In particular, the n-ZnS/ZnTe/p-ZnTe sample exhibited a large photocurrent even at a low applied potential in an electrolyte containing Eu3+ ion as an electron scavenger. Appreciable H-2 evolution with a constant rate (approximately 87 mu mol cm(-2) h(-1)) was also observed over the sample loaded with Pt deposits under visible-light irradiation (>420 nm): faradaic efficiency of almost 100% was obtained, indicating no unfavorable side reaction occurred in the sample.
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