Abstract

Semiconductors heterojunction and potential application have been investigated as strategy to improve the catalytic processes performance. In this study, we investigated the photocurrent response of photoanodes composed of two different heterojunctions, i.e., Fe₂O₃|WO₃ and WO₃|Fe₂O₃, which were prepared directly on transparent and conductive glass substrate (fluorine-doped tin oxide or FTO-glass) by combining hydrothermal and drop-casting methods. From photoelectrochemical studies, the conduction band edge’s positions for each semiconductor were determined using the Butler–Gärtner model. The heterojunction films were utilized as photoanode in photodegradation of Rhodamine B (RhB) dye in aqueous solution. Under polychromatic irradiation, superior performance was registered for FTO|WO₃|Fe₂O₃ photoanode, reaching a RhB dye photodegradation around of 32% in 3 h. Moreover, we performed structural analyses, optical characterizations, and morphological property investigations using XRD, UV−Vis, and SEM techniques, respectively. Moreover, from the electrochemical studies, the superior photodegradation performance and photocurrent density for photoanode were registered for FTO|WO₃|Fe₂O₃ film.

Graphic abstract

中文翻译：

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施加电势条件对Fe 2 O 3 | WO 3异质结薄膜光催化性能的影响

抽象的

已经研究了半导体异质结和潜在的应用作为改善催化工艺性能的策略。在这项研究中，我们研究了由两个不同的异质结组成的光阳极的光电流响应，所述异质结是Fe ₂ O ₃ | WO ₃和WO ₃ | Fe ₂ O _3。结合水热法和滴铸法，直接在透明导电玻璃基板（掺氟氧化锡或FTO玻璃）上制备。根据光电化学研究，使用Butler-Gärtner模型确定每个半导体的导带边缘位置。异质结薄膜被用作水溶液中若丹明B（RhB）染料光降解中的光阳极。在多色辐射下，FTO | WO ₃ | Fe ₂ O ₃表现出优异的性能光阳极，在3小时内达到RhB染料光降解约32％。此外，我们分别使用XRD，UV-Vis和SEM技术进行了结构分析，光学表征和形态特性研究。此外，从电化学研究来看，FTO | WO ₃ | Fe ₂ O ₃膜具有优异的光降解性能和光阳极的光电流密度。

图形摘要