Alteration of onset potentials of Rh-doped SrTiO3 electrodes for photoelectrochemical water splitting
Alteration of onset potentials of Rh-doped SrTiO3 electrodes for photoelectrochemical water splitting
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DOI：
10.1016/j.jcat.2020.08.029
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发表时间：
2020-11-01
影响因子：
7.3
通讯作者：
Ma, Guijun
中科院分区：
文献类型：
--
作者：
Guo, Mei;Ma, Guijun
Rh掺杂的钛酸锶(Rh-STO)是一种可见光响应型氧化物半导体光催化剂，可用于水的分解。在本工作中，通过改变Rh掺杂量或通过真空加热处理调整Ti3+/Rh-4+，Rh-3+离子的比例，使Rh-STO电极的起始电位在0~1.2V与RHE之间发生了较大范围的漂移。也就是说，成功地改变了该材料的光阴极和光阳极行为。用紫外-可见漫反射光谱和X射线光电子能谱对组成Rh-STO受主能级的Rh-4+、Rh-3+阳离子进行了表征。将所制备的Rh-STO光阳极和光阴极串联，实现了可见光驱动的低偏压光电化学分水。本工作提供了一种仅用一种半导体光催化剂即可实现整体裂水的新策略。(C)2020 Elsevier Inc.保留所有权利。
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+/Rh-4+,Rh-3+ cations through a vacuum-heating treatment. Namely, the photocathodic and photoanodic behavior of this material was successfully altered. The Rh-4+,Rh-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. (C) 2020 Elsevier Inc. All rights reserved.