Manipulating Oxygen Vacancy in SrTiO3 Nanoparticles to Achieve Enhanced Photoelectrochemical Performance in Water Splitting

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Applied Nano Materials Pub Date : 2024-11-27 DOI:10.1021/acsanm.4c0555810.1021/acsanm.4c05558

Xiaoli Ran, Yang Bai, Hao Zeng, Junhao Zhang, Haitao Fu*, Xizhong An and Xiaohong Yang*,

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Abstract

Introducing oxygen vacancies into perovskite-type SrTiO₃ nanoparticles usually takes dual or multiple steps, which are not conducive to subsequent modification and application. Herein, a facile nonstoichiometric method is applied to synthesize a series of oxygen vacancy (V_O)-doped SrTiO₃ (Sr_1–XTiO₃_–δ) as a photoanode material in photoelectrochemical (PEC) water-splitting reactions. Experimental results reveal a nonlinear relationship between the PEC performance and V_O concentration in SrTiO₃ nanoparticles. Sr_1–XTiO₃_–δ doped with an appropriate amount of V_O can significantly enhance its light response and electrocatalytic activity. The optimal Sr_0.95TiO₃_–δ demonstrated the best PEC activity with an incident photon-to-current conversion efficiency of 3.144 times higher than that of pristine SrTiO₃. Enhanced PEC activity is attributed to superior light absorption and retarded photogenerated charge carrier recombination. This work systematically reveals the role of oxygen vacancies in SrTiO₃ nanoparticles for achieving enhanced PEC performance in water splitting, which may offer inspiration for defect engineering of perovskite oxides.

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控制SrTiO3纳米颗粒中的氧空位以实现水分解中增强的光电化学性能

在钙钛矿型SrTiO3纳米颗粒中引入氧空位通常需要两个或多个步骤，这不利于后续改性和应用。本文采用简单的非化学计量方法合成了一系列氧空位（VO）掺杂的SrTiO3 （Sr1-XTiO3 -δ）作为光电化学（PEC）水分解反应的光阳极材料。实验结果表明SrTiO3纳米颗粒的PEC性能与VO浓度之间存在非线性关系。Sr1-XTiO3 -δ掺杂适量的VO可显著提高其光响应和电催化活性。最佳Sr0.95TiO3 -δ表现出最佳的PEC活性，入射光子-电流转换效率比原始SrTiO3高3.144倍。增强的PEC活性归因于优越的光吸收和延迟的光生电荷载流子重组。本研究系统地揭示了SrTiO3纳米颗粒中氧空位在水裂解中增强PEC性能的作用，为钙钛矿氧化物的缺陷工程提供了启示。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Applied Nano Materials Multiple-

CiteScore

8.30

自引率

3.40%

发文量

1601

期刊介绍： ACS Applied Nano Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics and biology relevant to applications of nanomaterials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important applications of nanomaterials.

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