Sodium-doped La2Ti2O7 synthesized by molten salt synthesis method for photocatalytic overall water splitting

IF 4.8 2区化学 Q2 CHEMISTRY, PHYSICAL Applied Catalysis A: General Pub Date : 2025-02-25 Epub Date: 2024-12-19 DOI:10.1016/j.apcata.2024.120079

Lijiao Zhong , Xing Li , Yiquan Zhan , Yongsheng Liu , Kai Yang , Jinbiao Liu , Shiyong Liu , Junzhe Jiang , Liqing Li , Yoshihisa Sakata

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Abstract

Solar-driven hydrogen production through water splitting is currently one of the research hotspots nowadays. Lanthanum titanate (La₂Ti₂O₇) is one kind of layered-structure perovskite photocatalyst and possesses a superior electronic structure for photocatalytic overall water splitting. However, it suffers from several drawbacks, such as poor photo absorption and easy recombination of photogenerated charge carriers. In this study, sodium (Na) ion-doped La₂Ti₂O₇ with plate-like crystal morphology was synthesized by using molten salt synthesis (MSS). The XRD and TEM results indicated that the MSS method enhanced the crystallinity of La₂Ti₂O₇. UV–vis, Raman and EPR spectra disclosed that Na doping through MSS introduced oxygen vacancies. The Na (0.3 mol%)-doped La₂Ti₂O₇ (MSS) provided the optimal hydrogen evolution rate, and the value was 6.43 times greater than that of pure La₂Ti₂O₇ synthesized by traditional solid-state reaction method. The synergistic effect of crystal facet engineering and defect engineering remarkably enhanced the photocatalytic activity of La₂Ti₂O₇.

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熔盐合成法合成光催化全水分解的掺钠La2Ti2O7

太阳能水裂解制氢是目前研究的热点之一。钛酸镧（La2Ti2O7）是一种层状结构的钙钛矿光催化剂，具有优越的光催化全水分解电子结构。然而，它有几个缺点，如光吸收性差，光生载流子容易重组。本研究采用熔盐合成（MSS）法制备了钠离子掺杂的片状晶体La2Ti2O7。XRD和TEM结果表明，MSS法增强了La2Ti2O7的结晶度。紫外可见光谱、拉曼光谱和EPR光谱显示，通过MSS掺杂Na引入了氧空位。Na（0.3 mol%）掺杂的La2Ti2O7 （MSS）具有最佳的析氢速率，是传统固相法合成的纯La2Ti2O7的6.43倍。晶面工程和缺陷工程的协同作用显著提高了La2Ti2O7的光催化活性。

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Cr(NO3)3·9H2O

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Na3RhCl6

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Na2CO3

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La2O3

来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.