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Anodic WO3 layers sensitized with hematite operating under the visible light spectrum
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DOI：10.1016/j.jpowsour.2022.231656.png)
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Abstract
En 中文
Tungsten oxide has been considered one of the most promising photoanode materials for photoelectrochemical (PEC) water splitting. WO3 possesses a relatively narrow band gap (2.5-2.8 eV) and superior charge transport properties. In this paper, for the first time, anodic WO3 layers were sensitized with Fe2O3 by electrodeposition and re-annealing method. The influence of FeCl3 concentration in the electrolyte used for the electrodeposition process on the morphology, semiconducting and photoelectrochemical properties was investigated. Since the band gap of hematite is narrower when compared to tungsten oxide, its modification/sensitization with hematite is a promising way to transfer WO3 photoactivity to the visible light region. To sum up, a successfully performed synthesis of Fe2O3-WO3 and Fe2O3-C,N-WO3 heterojunctions resulted in a shift of the material photoresponse towards the visible light region even to the wavelength of 550 nm. The best results were achieved for the Fe2O3-C,N-WO3 sample, that exhibits IPCE values about 1.6 times higher at 450 nm and 12 times higher at 480 nm in comparison to pristine anodic WO3.
Keywords:
Anodic tungsten oxide
Electrodeposition
Nanostructured morphology
Photoelectrochemical properties
Fe2O3-WO3 heterojunction
Journal
IF:
7.9
Papers:
3.7W
Citations:
15.0W