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 Eu ion as an electron scavenger. Appreciable H evolution with a constant rate (approximately 87 μmol cm h) 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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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9773017 | PMC |
| http://dx.doi.org/10.1039/d2ra06301h | DOI Listing |
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Article Synopsis
- This study examines how bare and zinc-covered ZnTe nanowires (NWs) change structurally before and after being oxidized at 300 °C.
- Using various microscopy and spectroscopy techniques, the researchers found that oxidation transforms the outer layer of the NWs into ZnO and affects the inner structure as well.
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