Enhanced photo/electrocatalytic efficiency of Zn-decorated TiO2 nanostructures for sustainable hydrogen evolution

IF 5.2 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today Pub Date : 2024-10-20 DOI:10.1016/j.cattod.2024.115103

Mohd Fazil , Jahangeer Ahmed , Tokeer Ahmad

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引用次数: 0

Abstract

Monophasic 1, 2.5, and 5 % Zn-decorated TiO₂ nanocatalysts have been fabricated by environmentally benign hydrothermal synthesis by avoiding expensive chemicals. As- prepared nanostructures have been investigated utilizing various sophisticated instruments like XRD, scanning and transmission electron microscopy, EDAX, Raman, optoelectronics as well as BET Surface Area studies. 2.5 % Zn- decorated TiO₂ was found to have superior photocatalytic performance, exhibiting an H₂ formation of 25.55 mmol

g_{cat}^{- 1}

in 8 hours and average H₂ generation of 3.15 mmol

g_{cat}^{- 1}

h⁻¹ at 170 W light intensity. Additionally, electrochemical investigations showed that 5 % and 2.5 % Zn-doped TiO₂ had a higher cathodic and anodic current density of 10 mA/cm² at −0.95, indicating that it has a higher HER catalytic activity, respectively. The synergistic impact of pristine TiO₂ and Zn-incorporated TiO₂ nanocatalysts is responsible for the increased kinetics of H₂ evolution, as it increases the separation and transfer of photo-charged (e^-/h⁺ pair) carriers and decreases redox potential for HER.

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提高锌装饰 TiO2 纳米结构的光催化/电催化效率，实现可持续氢气进化

单相 1%、2.5% 和 5% 镀锌二氧化钛纳米催化剂是通过无害环境的水热合成法制造的，避免了昂贵的化学品。制备的纳米结构利用各种精密仪器进行了研究，如 XRD、扫描和透射电子显微镜、EDAX、拉曼、光电子学以及 BET 表面积研究。研究发现，2.5 % Zn- 装饰的二氧化钛具有优异的光催化性能，在 170 W 光强下，8 小时内可生成 25.55 mmolgcat-1 的 H2，平均 H2 生成量为 3.15 mmolgcat-1h-1。此外，电化学研究表明，掺杂 5 % 和 2.5 % Zn 的 TiO2 在-0.95 时的阴极和阳极电流密度分别为 10 mA/cm2，表明其具有更高的 HER 催化活性。原始 TiO2 和掺杂 Zn 的 TiO2 纳米催化剂的协同作用是提高 H2 演化动力学的原因，因为它增加了光带电（e-/h+ 对）载流子的分离和转移，降低了 HER 的氧化还原电位。

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

Catalysis Today 化学-工程：化工

CiteScore

11.50

自引率

3.80%

发文量

573

审稿时长

2.9 months

期刊介绍： Catalysis Today focuses on the rapid publication of original invited papers devoted to currently important topics in catalysis and related subjects. The journal only publishes special issues (Proposing a Catalysis Today Special Issue), each of which is supervised by Guest Editors who recruit individual papers and oversee the peer review process. Catalysis Today offers researchers in the field of catalysis in-depth overviews of topical issues. Both fundamental and applied aspects of catalysis are covered. Subjects such as catalysis of immobilized organometallic and biocatalytic systems are welcome. Subjects related to catalysis such as experimental techniques, adsorption, process technology, synthesis, in situ characterization, computational, theoretical modeling, imaging and others are included if there is a clear relationship to catalysis.