期刊
CHEMICAL ENGINEERING JOURNAL
卷 435, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.135183
关键词
Bismuth vanadate; Heterostructure; Dual-textured; Charge collection; Photoelectrochemical water splitting
资金
- Basic Science Research Program through the National Research Foundation of Korea - Ministry of Science, ICT, and Future Planning [NRF-2019R1A2C2002024, 2021R1A4A1031357]
A novel dual-textured BiVO4 / Sb:SnO2 heterostructure was successfully synthesized as a photoanode for photoelectrochemical water splitting. The synthesized heterostructure exhibited a considerable enhancement in charge collection performance, resulting in a photocurrent density approximately four times higher than a single-textured heterostructure. This study provides new insights into the design of efficient photoelectrodes.
Heterostructure engineering, combining dissimilar materials into a single substrate, allows the alteration of the optical, electrical, and electrochemical properties of photoelectrodes for photoelectrochemical (PEC) water splitting. Herein, we successfully synthesized a novel dual-textured BiVO4 / Sb:SnO2 heterostructure as a photoanode for PEC water-splitting devices. Sb:SnO2 (ATO) nanorods (NRs) with a [001] growth orientation were first grown on a fluorine-doped tin oxide substrate by a hydrothermal method. Subsequently, the BiVO4 (BVO) seed layer was deposited on the ATO NRs using a solution spin-coating followed by a second hydrothermal growth to synthesize the dual-textured BVO/ATO heterostructure (dt-BAH). The resultant dt-BAH photoanode was composed of (001)-textured BVO on the [001]-oriented single-crystalline ATO NRs, and their interface exhibited intimate junctions. In addition, the textured BVO exhibited two different facets of (001) and (101). Notably, the synthesized dt-BAH photoanode showed a considerable enhancement in charge collection performance, resulting in a photocurrent density approximately four times higher than that of the textured BVO grown on the randomly oriented ATO nanoparticle film (single-textured BAH). Our results provide new insights into heterostructure design for the development of efficient photoelectrodes.
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