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Alteration of onset potentials of Rh-doped SrTiO3 electrodes for photoelectrochemical water splitting
Journal of Catalysis ( IF 7.3 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.jcat.2020.08.029
Mei Guo , Guijun Ma

Rh-doped SrTiO3 (Rh-STO) is a visible-light-responsive oxide semiconductor photocatalyst with applications to water splitting. In this work, the onset potentials of the Rh-STO electrodes were shifted in a wide range from 0 to 1.2 V vs. RHE via changing the amount of Rh dopants, or adjusting the ratio of Ti3+/Rh4+,3+ cations through a vacuum-heating treatment. Namely, the photocathodic and photoanodic behavior of this material was successfully altered. The Rh4+,3+ cations that composing the acceptor energy levels of Rh-STO were characterized with UV–Vis diffuse reflectance and X-ray photoelectron spectroscopies. Visible-light-driven low-biased photoelectrochemical water splitting was achieved by connecting the as-prepared Rh-STO photoanode and photocathode in series. This work provides a new strategy of accomplishing overall water splitting using only one kind of semiconductor photocatalyst.



中文翻译:

掺Rh的SrTiO 3电极光电化学水分解起始电位的改变

掺铑SrTiO 3(Rh-STO)是可见光响应型氧化物半导体光催化剂,可用于水分解。在这项工作中,通过更改Rh掺杂剂的量或调整Ti 3+ / Rh 4 +,3 +的比例,Rh-STO电极的起始电位相对于RHE在0至1.2 V的宽范围内变化阳离子通过真空加热处理。即,该材料的光阴极和光阳极行为已成功改变。Rh 4 +,3 +组成Rh-STO受体能级的阳离子通过UV-Vis漫反射和X射线光电子能谱进行表征。可见光驱动的低偏光电化学水分解是通过串联制备的Rh-STO光电阳极和光电阴极实现的。这项工作提供了一种仅使用一种半导体光催化剂即可完成总水分解的新策略。

更新日期:2020-09-15
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