A tungsten phosphide cocatalyst enhanced bismuth tungstate photoanode with the robust built-in electric field towards highly efficient photoelectrochemical water splitting,Journal of Colloid and Interface Science

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A tungsten phosphide cocatalyst enhanced bismuth tungstate photoanode with the robust built-in electric field towards highly efficient photoelectrochemical water splitting
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2024-01-24 , DOI: 10.1016/j.jcis.2024.01.161
Xueyang Leng ₁ , Jinlong Bai ₁ , Zheng Dai ₁ , Suyao Man ₁ , Bo Lei ₁ , Jing Yao ₁ , Lina Bai ₁ , Hong Gao ₁ , Lingling Xu ₁

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The use of low-cost and effective cocatalyst is a potential strategy to optimize the effectiveness of photoelectrochemical (PEC) water splitting. In this study, tungsten phosphide (WP) is introduced as a remarkably active cocatalyst to enhance the PEC efficiency of a BiWO photoanode. The onset potential of BiWO/WP demonstrates a negative shift, while the photocurrent density demonstrates a significant 5.5-fold increase compared to that of unmodified BiWO at 1.23 V (reversible hydrogen electrode). The loading of WP cocatalyst facilitates the rapid transfer of holes, increasing the range of visible light absorption, the water adsorption ability as well as promoting the separation of photogenerated electrons and holes via the built-in electric field between BiWO and WP. This study proposes a strategy to hinder the recombination of electron-hole pairs by using WP cocatalyst as a hole capture agent, improve the photoelectric conversion efficiency, and enhance the overall photoelectrochemical properties of BiWO photoanode.

中文翻译：

磷化钨助催化剂增强钨酸铋光阳极，具有强大的内置电场，可实现高效光电化学水分解

使用低成本且有效的助催化剂是优化光电化学（PEC）水分解效率的潜在策略。在这项研究中，磷化钨（WP）被引入作为一种非常活跃的助催化剂，以提高 BiWO 光电阳极的 PEC 效率。 BiWO/WP 的起始电位表现出负移，而在 1.23 V（可逆氢电极）下，光电流密度与未修饰的 BiWO 相比显着增加了 5.5 倍。 WP助催化剂的负载有利于空穴的快速转移，增加可见光吸收范围和水吸附能力，并通过BiWO和WP之间的内置电场促进光生电子和空穴的分离。本研究提出了一种利用WP助催化剂作为空穴捕获剂来阻碍电子-空穴对复合的策略，提高光电转换效率，增强BiWO光阳极的整体光电化学性能。

更新日期：2024-01-24

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