Design and fabrication of double heterojunctions of WO3/BiVO4/Cu2O photoanode for photoelectrochemical water splitting

IF 4.1 3区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Photochemistry and Photobiology A-chemistry Pub Date : 2024-11-15 DOI:10.1016/j.jphotochem.2024.116156

Shiyu Jia , Yanling Fang , Ziyang Liu , Ke Tian , Xiangbo Zhao , Shouli Bai

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Abstract

To overcome the shortcoming of photon-generated electrons and holes recombination for WO₃ photoanode in photoelectrochemical (PEC) water splitting, WO₃/BiVO₄/Cu₂O n-n-p double heterojunction photoanode was designed and prepared by a simple drop-casting method and electrodeposition, which can enhance the photoelectrochemical performance of the WO₃ photoanode due to the successful constructions of the type II heterojunctions. The ternary photoanode increased the photocurrent density from 0.50 mA·cm⁻² for WO₃ photoanode at 1.23 V (vs. RHE) to 5.00 mA·cm⁻² for WO₃/BiVO₄/Cu₂O photoanode. Compared with WO₃ photoanode, the visible light absorption range of the WO₃/BiVO₄/Cu₂O photoanode is expanded (verified in the UV–vis absorption curve) and the utilization efficiency of visible light is significantly improved. The mechanism of PEC process is also discussed in detail, which is attributed to the fact that the carrier separation efficiency is greatly improved by the migration of photogenerated electrons and holes in opposite directions at the double heterojunctions interface.

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设计和制造用于光电化学水分离的 WO3/BiVO4/Cu2O 双异质结光电阳极

为了克服 WO3 光阳极在光电化学（PEC）分水过程中光子产生的电子和空穴重组的缺点，采用简单的滴铸法和电沉积法设计并制备了 WO3/BiVO4/Cu2O n-n-p 双异质结光阳极，由于成功地构建了 II 型异质结，该方法可以提高 WO3 光阳极的光电化学性能。三元光阳极将光电流密度从 1.23 V（相对于 RHE）下 WO3 光阳极的 0.50 mA-cm-2 提高到了 WO3/BiVO4/Cu2O 光阳极的 5.00 mA-cm-2。与 WO3 光阳极相比，WO3/BiVO4/Cu2O 光阳极的可见光吸收范围扩大了（紫外-可见吸收曲线证实了这一点），可见光的利用效率显著提高。此外，还详细讨论了 PEC 过程的机理，其原因是光生电子和空穴在双异质结界面向相反方向迁移，从而大大提高了载流子分离效率。

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来源期刊

Journal of Photochemistry and Photobiology A-chemistry 化学-物理化学

CiteScore

7.90

自引率

7.00%

发文量

580

审稿时长

48 days

期刊介绍： JPPA publishes the results of fundamental studies on all aspects of chemical phenomena induced by interactions between light and molecules/matter of all kinds. All systems capable of being described at the molecular or integrated multimolecular level are appropriate for the journal. This includes all molecular chemical species as well as biomolecular, supramolecular, polymer and other macromolecular systems, as well as solid state photochemistry. In addition, the journal publishes studies of semiconductor and other photoactive organic and inorganic materials, photocatalysis (organic, inorganic, supramolecular and superconductor). The scope includes condensed and gas phase photochemistry, as well as synchrotron radiation chemistry. A broad range of processes and techniques in photochemistry are covered such as light induced energy, electron and proton transfer; nonlinear photochemical behavior; mechanistic investigation of photochemical reactions and identification of the products of photochemical reactions; quantum yield determinations and measurements of rate constants for primary and secondary photochemical processes; steady-state and time-resolved emission, ultrafast spectroscopic methods, single molecule spectroscopy, time resolved X-ray diffraction, luminescence microscopy, and scattering spectroscopy applied to photochemistry. Papers in emerging and applied areas such as luminescent sensors, electroluminescence, solar energy conversion, atmospheric photochemistry, environmental remediation, and related photocatalytic chemistry are also welcome.