Effect of Different Molten Salts on Structure and Water Splitting Performance of Al-Doped Fillet Polyhedral SrTiO3

IF 13 2区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Small Pub Date : 2024-12-01 DOI:10.1002/smll.202407963
Chuyu Wang, Qibo Jia, Xiaodong Zhang, Xi Chen, Yang Wang, Gangqiang Yu, Dongping Duan
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Abstract

Strontium titanium (SrTiO3) is a promising photocatalyst, but enhancing the separation, migration, and utilization of photocarriers, requires SrTiO3 with exposed anisotropic facets and minimal defect density. Here, we used NaCl and SrCl2 as fluxes to synthesize fillet polyhedral SrTiO3 particles, with Al3+ selectively adsorbed as the morphology regulator on high-energy crystal facets. Notably, Al-doped SrTiO3 synthesized in SrCl2 exhibits regular polyhedral morphology with {100}, {110}, and high-index {112} facets, showing high surface activity, low internal defect density, and superior photocatalytic performance. The excellent performance is attributed to the spatial separation of photocarriers on different crystal facets. In situ photodeposition experiments confirmed that photogenerated electrons were concentrated on the {100} facets, while holes were concentrated on the {110} and {112} facets, effectively impeding recombination. After loading RhCrOx/CoOx, Al-doped SrTiO3 synthesized in SrCl2 achieves a hydrogen evolution rate of 255 µmol h−1, 64 times higher than that of Al-doped SrTiO3 synthesized in NaCl. Additionally, increasing amounts of cocatalysts further enhances the photocatalytic performance, with the average hydrogen evolution rate of SrTiO3 reaching 319 µmol h⁻¹, an apparent quantum yield of 3.5% at 365 nm, and a solar-to- hydrogen value of 0.181%. This discovery offers new insights into designing efficient photocatalysts for hydrogen production.

Abstract Image

不同熔盐对掺铝圆角多面体SrTiO3结构和水裂解性能的影响
锶钛(SrTiO3)是一种很有前途的光催化剂,但提高光载流子的分离、迁移和利用,需要SrTiO3具有暴露的各向异性和最小的缺陷密度。本文以NaCl和SrCl2为助熔剂合成了圆角多面体SrTiO3颗粒,Al3+选择性吸附在高能晶面上作为形态调节剂。值得注意的是,在SrCl2中合成的Al掺杂SrTiO3具有{100},{110}和高指数{112}面的规则多面体形态,具有高表面活性,低内部缺陷密度和优异的光催化性能。这种优异的性能是由于光载流子在不同晶面上的空间分离。原位光沉积实验证实,光生成的电子集中在{100}表面,而空穴集中在{110}和{112}表面,有效地阻碍了复合。负载RhCrOx/CoOx后,在SrCl2中合成的Al掺杂SrTiO3的析氢速率为255µmol h−1,比在NaCl中合成的Al掺杂SrTiO3的析氢速率高64倍。此外,增加助催化剂的用量进一步提高了SrTiO3的光催化性能,SrTiO3的平均析氢速率达到319µmol h⁻¹,在365 nm处的表观量子产率为3.5%,太阳-氢值为0.181%。这一发现为设计高效的产氢光催化剂提供了新的见解。
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来源期刊
Small
Small 工程技术-材料科学:综合
CiteScore
17.70
自引率
3.80%
发文量
1830
审稿时长
2.1 months
期刊介绍: Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments. With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology. Small's readership includes biochemists, biologists, biomedical scientists, chemists, engineers, information technologists, materials scientists, physicists, and theoreticians alike.
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