WO3/BiVO4 heterojunction photoanodes: Optimized photoelectrochemical performance in relation to both oxides layer thickness

IF 5.2 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today Pub Date : 2024-11-19 DOI:10.1016/j.cattod.2024.115137

Annalisa Polo , Chiara Nomellini , Gianluigi Marra , Elena Selli , Maria Vittoria Dozzi

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引用次数: 0

Abstract

An effective strategy to boost the photoelectrochemical (PEC) performance of photoactive materials consists in combining different semiconductors with complementary characteristics, to build type-II heterojunctions. In particular, WO₃/BiVO₄ photoanodes exhibit synergistic effects in the photo-oxidation of water into molecular oxygen, usually overwhelming possible recombination paths at work within the heterojunction. We present here a systematic PEC investigation on composite WO₃/BiVO₄ photoanodes with various WO₃ and BiVO₄ layer thickness (200–800 nm and 40–140 nm, respectively), in comparison with equally thick single WO₃ and BiVO₄ photoanodes, performed under either solar or monochromatic irradiation. We demonstrate that detrimental charge recombination is mainly active under back-side irradiation and is mitigated by minimizing the absorption of both tungsten trioxide and bismuth vanadate layers. Higher photocurrent values are in general attained when the photoanodes are irradiated through the electrolyte/electrode interface, with the best performing photoanodes being composed of ca. 500 nm- and 140 nm-thick WO₃ and BiVO₄ layers, respectively.

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WO3/BiVO4 异质结光电阳极：优化光电化学性能与两种氧化物层厚度的关系

提高光活性材料的光电化学（PEC）性能的一个有效策略是将具有互补特性的不同半导体结合起来，建立 II 型异质结。其中，WO3/BiVO4 光阳极在将水光氧化成分子氧的过程中表现出协同效应，通常会压倒异质结内可能存在的重组途径。在此，我们对具有不同 WO3 和 BiVO4 层厚度（分别为 200-800 nm 和 40-140 nm）的 WO3/BiVO4 复合光阳极进行了系统的 PEC 研究，并与同等厚度的单一 WO3 和 BiVO4 光阳极进行了比较，研究是在太阳能或单色辐照条件下进行的。我们证明，有害的电荷重组主要是在背侧辐照下发生的，通过最大限度地减少三氧化钨层和钒酸铋层的吸收可以缓解这种现象。通过电解质/电极界面照射光阳极时，一般能获得更高的光电流值，性能最好的光阳极分别由厚度约为 500 nm 的 WO3 层和厚度为 140 nm 的 BiVO4 层组成。

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来源期刊

Catalysis Today 化学-工程：化工

CiteScore

11.50

自引率

3.80%

发文量

573

审稿时长

2.9 months

期刊介绍： Catalysis Today focuses on the rapid publication of original invited papers devoted to currently important topics in catalysis and related subjects. The journal only publishes special issues (Proposing a Catalysis Today Special Issue), each of which is supervised by Guest Editors who recruit individual papers and oversee the peer review process. Catalysis Today offers researchers in the field of catalysis in-depth overviews of topical issues. Both fundamental and applied aspects of catalysis are covered. Subjects such as catalysis of immobilized organometallic and biocatalytic systems are welcome. Subjects related to catalysis such as experimental techniques, adsorption, process technology, synthesis, in situ characterization, computational, theoretical modeling, imaging and others are included if there is a clear relationship to catalysis.