2026-10-14T15:45:32Z https://www.scidb.cn/oai

10.57760/sciencedb.00zrw 2026-08-18T11:37:35Z

2026-08-18 Scandium Doping Enhanced Photocatalytic Overall Water Splitting over Strontium Titanate doi:10.57760/sciencedb.00zrw en  Efficient photocatalytic overall water splitting represents one of the most promising routes for renewable hydrogen production. The realization of this process critically depends on the development of photocatalysts with high activity and stability. In recent years, substantial progress has been made in enhancing the performance of SrTiO3-based photocatalysts. Nevertheless, the quantum efficiency of most SrTiO3-based systems at 375 nm remains limited to approximately 45%. In this work, scandium was introduced into SrTiO3 via a solid-state synthesis method, followed by the construction of Rh-Cr-Co composite cocatalysts through a photodeposition process. The as-prepared photocatalyst achieved overall water splitting under Xe-lamp irradiation at ambient pressure in the absence of Al. The apparent quantum efficiency (AQE) reached 95.11% at 365 nm and 75.46% at 375 nm. Under full-spectrum irradiation, the optimal catalyst exhibited a hydrogen evolution rate of 6.32 mmol·h−1·g−1. The results reveal that Sc doping partially compensates Ti3+ defect sites and induces the formation of additional surface hydroxyl groups, which promotes the preferential exposure of (100) facets of SrTiO3. This structural modulation facilitates the selective photodeposition of Rh@Cr2O3 and CoOOH on the (100) and (110) facets of SrTiO3, respectively. Such spatially selective distribution of cocatalysts effectively separates the hydrogen evolution and oxygen evolution active sites, thereby significantly enhancing the photocatalytic activity for overall water splitting. Sc doping; cocatalyst; selective deposition; SrTiO3; photocatalysis Zheng Hanyue Lv Gongxuan PUBLIC https://creativecommons.org/licenses/by-nc-nd/4.0/ dataset http://www.doi.org/10.3724/j.issn1001-3555.2026.04.003 Science Data Bank