原位生长WO3/Bi2WO6构筑界面内建电场增强光电极电荷分离与传输的研究

doi:10.11896/cldb.24120134

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Abstract Photoelectrocatalysis is considered a crucial energy storage technology for converting solar energy into renewable energy sources. The photoelectrochemical reaction efficiency is controlled by light harvesting, charge separation and transfer (CST), and surface reaction efficiency, with CST being particularly critical. WO₃-based photocatalytic materials have garnered widespread attention due to high chemical stability, long hole diffusion distance, and moderate bandgap. However, the low efficiency of CST in WO₃-based photocatalytic materials remains a challenge, hampering their practical applications. To address this issue, this work uses a method of in-situ growth to coat Bi₂WO₆ on the surface of WO₃ to form a heterojunction and construct built-in electric fields at the interface to effectively improve the driving force of photogenerated charge separation and transmission. The results showed that the WO₃/Bi₂WO₆ composite photoanode film has a type Ⅱ heterojunction structure, and its surface photovoltage reaches 8.7 μV, which is 142% and 81% higher than those of WO₃ and Bi₂WO₆, respectively. The photocurrent density is 3.28 mA·cm^-2 @1.23 V vs. RHE, which is 91% and 143% higher than those of WO₃ and Bi₂WO₆, respectively.

Key words： tungsten oxide bismuth tungstate built-in electric field charge separation and transfer heterojunction

Published: 10 October 2025 Online: 2025-09-24

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TB34

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	ZHANG Banchao
	CHENG Houyan

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ZHANG Banchao,CHENG Houyan. Study on Constructing the Interface Built-in Electric Fields Through In-situ Growth of WO₃/Bi₂WO₆ to Enhance the Charge Separation and Transfer of Photoelectrodes[J]. Materials Reports, 2025, 39(19): 24120134-8.

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https://www.mater-rep.com/EN/10.11896/cldb.24120134 OR https://www.mater-rep.com/EN/Y2025/V39/I19/24120134

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