The impact of surface composition on the interfacial energetics and photoelectrochemical properties of BiVO4
The impact of surface composition on the interfacial energetics and photoelectrochemical properties of BiVO4
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DOI：
10.1038/s41560-021-00777-x
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发表时间：
2021-02-18
期刊：
影响因子：
56.7
通讯作者：
Choi, Kyoung-Shin
中科院分区：
文献类型：
--
作者：
Lee, Dongho;Wang, Wennie;Choi, Kyoung-Shin
设计光电极表面的能力对于优化用于太阳能燃料生产的任何光电极的性能至关重要。改变光电极表面暴露的晶面一直是改变其表面结构的主要策略。然而，即使对于同一面，也存在多种终止表面的方法，这可以显着改变光电极的特性。在这里，我们报告了具有富钒和富铋（010）面的外延 BiVO4 光电极的紧密集成的实验和计算研究。我们的研究表明，即使对于相同的面，表面 Bi:V 比率对界面能量和光电化学性质也有显着影响。我们还阐明了表面成分如何影响光电化学性质的微观根源。这项研究通过调整多元氧化物光电极的表面终止/成分，为理解和工程表面能量学开辟了一条未探索的道路。众所周知，表面刻面会影响太阳能燃料生产中光电极的行为；然而，即使对于同一面，表面成分的作用也可能会有所不同，但人们对它的作用还不太了解。作者发现表面 Bi:V 比是影响 BiVO4 光阳极性能的关键因素。
The ability to engineer a photoelectrode surface is pivotal for optimizing the properties of any photoelectrode used for solar fuel production. Altering crystal facets exposed on the surface of photoelectrodes has been a major strategy to modify their surface structure. However, there exist numerous ways to terminate the surface even for the same facet, which can considerably alter the photoelectrode properties. Here we report tightly integrated experimental and computational investigations of epitaxial BiVO4 photoelectrodes with vanadium- and bismuth-rich (010) facets. Our study demonstrates that even for the same facet the surface Bi:V ratio has a remarkable impact on the interfacial energetics and photoelectrochemical properties. We also elucidate the microscopic origins of how the surface composition can affect the photoelectrochemical properties. This study opens an unexplored path for understanding and engineering surface energetics via tuning the surface termination/composition of multinary oxide photoelectrodes.Surface facets are known to influence the behaviour of photoelectrodes for solar fuel production; however, the role of surface composition, which can vary even for the same facet, is less well understood. Here the authors find that the surface Bi:V ratio is a key factor that affects properties of BiVO4 photoanodes.