Z-Scheme Transfer Path of Charges in the BiVO4/Bi:ZnIn2S4-Co Photoanode for Photoelectrochemical Water Splitting

IF 5.4 3区材料科学 Q2 CHEMISTRY, PHYSICAL

ACS Applied Energy Materials Pub Date : 2024-11-30 DOI:10.1021/acsaem.4c0234210.1021/acsaem.4c02342

Xinyang Fu, Yixin Qi, Yanan Zhao, Weibing Li* and Yaping Zhang*,

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Abstract

The significant carrier recombination occurring in the bulk of BiVO₄ is a primary factor limiting the enhancement of its photoelectrochemical performance. To address this issue, we have incorporated two-dimensional (2D) nanosheet morphology Bi:ZnIn₂S₄ and Co sites onto the surface of BiVO₄ to create an effective composite photoanode. According to the ultraviolet-visible diffuse reflectance spectroscopy and ultraviolet photoelectron spectroscopy results, it was inferred that a Z-scheme transfer path of charges was formed between BiVO₄ and Bi:ZnIn₂S₄, which promoted the separation of bulk phase carriers. Additionally, the 2D topography of Bi:ZnIn₂S₄ also shortens the transmission distance of the carriers. Furthermore, the presence of Co sites provides more active sites for the surface hydrolysis reaction to proceed. Ultimately, under AM1.5G illumination, the photocurrent density of the BiVO₄/Bi:ZnIn₂S₄-Co photoanode reaches 3.6 mA cm^–2 at 1.23 V vs reversible hydrogen electrodes.

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BiVO4/Bi:ZnIn2S4-Co光电阳极中电荷的Z-Scheme转移路径

大量的BiVO4载流子重组是限制其光电性能增强的主要因素。为了解决这个问题，我们在BiVO4表面加入了二维（2D）纳米片形态的Bi:ZnIn2S4和Co位点，以创建有效的复合光阳极。根据紫外-可见漫反射光谱和紫外光电子能谱结果推断，BiVO4和Bi:ZnIn2S4之间形成了Z-scheme电荷转移路径，促进了体相载流子的分离。此外，Bi:ZnIn2S4的二维形貌也缩短了载流子的传输距离。此外，Co位点的存在为表面水解反应的进行提供了更多的活性位点。最终，在AM1.5G照明下，在1.23 V vs可逆氢电极下，BiVO4/Bi:ZnIn2S4-Co光阳极的光电流密度达到3.6 mA cm-2。

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来源期刊

ACS Applied Energy Materials Materials Science-Materials Chemistry

CiteScore

10.30

自引率

6.20%

发文量

1368

期刊介绍： ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.