Ferroelectric polarization enabled spatially selective adsorption of redox mediators to promote Z-scheme photocatalytic overall water splitting
Ferroelectric polarization enabled spatially selective adsorption of redox mediators to promote Z-scheme photocatalytic overall water splitting
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DOI：
10.1016/j.joule.2022.06.017
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发表时间：
2022-08-17
期刊：
影响因子：
39.8
通讯作者：
Cheng, Hui-Ming
中科院分区：
文献类型：
--
作者：
Kang, Yuyang;Qi, Haozhi;Cheng, Hui-Ming
模拟自然光合作用的人工Z型体系在光催化水分解中显示出良好的应用前景，但其存在氧化还原介体的副反应，严重影响了光载体的利用效率。在这里，我们建议通过使用铁电极化抑制副反应，这不仅提供了一个强大的驱动力，以空间分离的光载流子的相反极化的表面，但也诱导氧化还原离子的空间选择性吸附。采用单畴铁电PbTiO_3纳米片作为模型铁电体，用BiVO_4粒子和阳离子氧化还原介体构建了Z型体系。与无活性的多畴铁电PbTiO 3基系统相比，如此形成的Z-方案系统在可见光和模拟太阳日射下都提供了用于光催化整体水裂解的稳定的高活性。本工作为实现基于单畴铁电Z型系统的高效太阳能光催化分解水提供了一个概念证明。
Although the artificial Z-scheme system, mimicking natural photosyn-thesis, has shown promising applications in photocatalytic water split-ting, it often suffers from the side reaction of redox mediator, which considerably undermines the efficacy of photocarrier utilizations. Herein, we propose to suppress the side reaction by using ferroelec-tric polarization, which not only provides a strong driving force to spatially separate photocarriers to the oppositely poled surface but also induces spatially selective adsorption of redox ions. Single -domain ferroelectric PbTiO3 nanoplates have been adopted as a model ferroelectric to construct the Z-scheme system with BiVO4 par-ticles and a cationic redox mediator. In contrast to the inactive multi -domain ferroelectric PbTiO3-based system, the so-formed Z-scheme system delivers stable high activity for photocatalytic overall water splitting under both visible light and simulated solar insolation. This work offers a proof of concept to realize efficient solar photocatalytic water splitting based on single-domain ferroelectric Z-scheme system.