Herein, a two-pronged approach to obtain excellent visible-light performance of SrTiO₃/TiO₂ photoelectrodes for water oxidation is presented. More specifically, the combination of hetero-constructing SrTiO₃ nanocubes and Cr³⁺/Ti³⁺ dual-doping has been demonstrated for achieving high efficiency of charge separation and extending photoresponse of TiO₂ nanotube arrays from the UV to visible light region. As expected, this unique Cr-SrTiO_3−x/Cr-TiO_2−x photoanode exhibited remarkably improved PEC performance for water splitting (4.05 mA cm⁻²) under visible light irradiation, which is more than 100 times higher than that of pristine TiO₂ nanotube arrays. Additionally, the photocurrent intensity as well as water splitting behavior remain constant even after long time irradiation, revealing its high PEC as well as structure stability. Thereby, the rational design of the interface charge transport and precise management of optical absorption endow the TiO₂-based PEC system with excellent and stable visible-light performance for water splitting.

中文翻译：

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通过电荷传输设计和光吸收管理实现可见光水分解 的高效SrTiO ₃ / TiO ₂杂光电阳极†

在本文中，提出了一种用于水氧化的SrTiO ₃ / TiO ₂光电电极获得优异可见光性能的两管齐下的方法。更具体地，已经证明异质结构的SrTiO ₃纳米立方体和Cr ³⁺ / Ti ³⁺双掺杂的组合用于实现电荷分离的高效率并且使TiO ₂纳米管阵列的光响应从UV扩展到可见光区域。正如预期的那样，这种独特的Cr-SrTiO _{3− x} / Cr-TiO _{2− x}光电阳极表现出显着改善的PEC性能，可用于水分解（4.05 mA cm ^-2）在可见光照射下，比原始TiO ₂纳米管阵列高100倍以上。此外，即使经过长时间的照射，光电流强度和水分解行为也保持恒定，从而显示出高的PEC以及结构稳定性。因此，界面电荷传输的合理设计和光吸收的精确管理赋予了基于TiO ₂的PEC系统优异的水分解稳定性和稳定的可见光性能。