In an attempt to develop environmentally friendly fuel alternatives, interest has increased in the potential application of photocatalytic materials that use solar energy to split water and produce hydrogen.1,2 However, because known photocatalysts are too inefficient to produce hydrogen at competitive prices,3,4 it is important to understand how they can be improved.5 Morrison detailed the most important characteristics a photocatalyst must exhibit to efficiently split water using sunlight.6 One important characteristic is the ability to spatially separate the reduction and oxidation reaction sites on the catalyst surface, which decreases the recombination of photogenerated charge carriers and reaction products.6 Oxidation and reduction sites can be separated if different areas of the catalyst surface have different surface potentials, which results in relatively more photocathodic and photoanodic regions.6 Regions of different surface potential might arise from differences in orientation,7,8 chemical termination,9-11 or internal polarizations resulting from ferroelectric12-14 or ferroelastic domains.15,16 Most of the prior work focused on how a single source of varying surface potential affected reactivity. Pisat et al17 recently showed that when the influence of both different surface orientations and different chemical terminations on the surfaces of SrTiO3 grains were considered together, surface orientation played the dominant role in determining the reactivity and the chemical termination affected reactivity in a secondary way. The goal of this study was to determine the relative influence of surface orientation and the ferroelastic domain structure on the photocathodic reactivity of CaTiO3. The surfaces of ferroelastic materials have been shown to have relatively photocathodic and photoanodic sites associated with alternating ferroelastic domains that spatially separate Received: 3 January 2020 | Revised: 23 February 2020 | Accepted: 8 March 2020 DOI: 10.1111/jace.17107

中文翻译：

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表面取向对CaTiO 3 光化学反应性的影响

这导致相对更多的光阴极和光阳极区域。6 不同表面电位的区域可能由取向不同、7,8 化学终止、9-11 或由铁电 12-14 或铁弹性域引起的内部极化引起。 15,16 大多数先前的工作集中在不同表面电位的单一来源如何影响反应性。Pisat 等人最近表明，当同时考虑不同表面取向和不同化学终止对 SrTiO3 晶粒表面的影响时，表面取向在决定反应性方面起主导作用，而化学终止以次要方式影响反应性。本研究的目的是确定表面取向和铁弹性域结构对 CaTiO3 光阴极反应性的相对影响。铁弹性材料的表面已被证明具有相对的光阴极和光阳极位置，这些位置与在空间上分开的交替铁弹性域相关联 接收日期：2020 年 1 月 3 日 | 修订日期：2020 年 2 月 23 日 | 接受：2020 年 3 月 8 日 DOI：10.1111/jace.17107