二价金属阳离子双位点共掺杂策略在SrTiO3上增强光催化水分解

IF 8.3 2区 工程技术 Q1 CHEMISTRY, PHYSICAL
Yimeng Cao , Fang Chen , Yongshuai Chen , Mengdie Cai , Jiawei Xue , Yuxue Wei , Jia-qi Bai , Lisheng Guo , Song Sun
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引用次数: 0

摘要

低价金属阳离子双位点共掺杂是一种有效降低SrTiO3(STO)中Ti3+缺陷以实现高效制氢的新策略。在这项研究中,K+和Al3+成功地在STO钙钛矿结构的Sr和Ti位点上实现了共掺杂。值得注意的是,优化后的0.5K, 1Al-STO样品对H2和O2的分解性能分别为523.73 μmol h−1和256.00 μmol h−1,比纯STO提高了17.54倍。这种显著的增强归因于二元低价金属掺杂,它们平衡了STO中由氧空位引起的富电子态,促进了Ti3+再氧化为Ti4+。此外,先进的表征技术和密度泛函理论(DFT)计算表明,K+掺杂促进了Al3+的掺入,而它们的协同作用增强了水分子的吸附,降低了水裂解反应的激活势垒。因此,低价共掺杂策略为表面相互作用的潜在机制和催化性能的改善提供了有价值的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A dual-site co-doping strategy with binary low-valence metal cations for enhanced photocatalytic water splitting over SrTiO3
Dual-site co-doping with low-valence metal cations is a novel strategy to effectively reduce Ti3+ defects in SrTiO3(STO) for efficient hydrogen generation. In this study, the K+ and Al3+ were successfully used to achieve co-doping at both the Sr and Ti sites of the STO perovskite structure. Notably, the optimized 0.5K, 1Al-STO sample exhibited water splitting performance of 523.73 μmol h−1 for H2 and 256.00 μmol h−1 for O2, respectively, representing a 17.54-fold improvement compared to pure STO. This significant enhancement is attributed to binary low-valence metal dopants, which balance the electron-rich states caused by oxygen vacancies in STO and promote the re-oxidation of Ti3+ to Ti4+. Furthermore, advanced characterization techniques and density functional theory (DFT) calculations indicate that K+ doping facilitates the incorporation of Al3+, while their synergistic effect enhances adsorption of water molecule and lowers the activation barrier for the water splitting reaction. Therefore, the low-valence co-doping strategy provides valuable insights into the potential mechanisms of surface interactions and the improvement of catalytic performance.
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来源期刊
International Journal of Hydrogen Energy
International Journal of Hydrogen Energy 工程技术-环境科学
CiteScore
13.50
自引率
25.00%
发文量
3502
审稿时长
60 days
期刊介绍: The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.
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