Electric Field-assisted Photocatalytic Reduction of Carbon Dioxide over Titanium Dioxide: Influence of the Type and Strength of Electric Field

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2024-12-02 DOI:10.1007/s10562-024-04887-5

Oleksandr Shtyka, Radoslaw Ciesielski, Adam Kedziora, Malgorzata Szynkowska-Jozwik, Tomasz Maniecki

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Abstract

This study focuses on investigating the sole impact of an external electric field on the photocatalytic activity of TiO₂-based materials. Typically, built-in electric fields are used to efficiently separate free energy carriers and improve the photocatalytic performance of semiconductors. The creation of such field requires modifications to the photocatalyst that alter various properties such as adsorption and optical characteristics. These modifications make it challenging to isolate and interpret the promotion effect associated with the electric field alone. The investigations were carried out in the gas-phase conditions in a specially constructed reactor equipped with two electrodes connected to a high – voltage that provides a field strength of up to 5.7·10³ V/cm. The results showed that the effect of electric field promotion varied significantly depending on the properties of titanium dioxide, such as structure, adsorption, and presence of impurities. The strength and the type (direct or alternating current) of the electric field also played a determining role. The greatest promoting effect was observed for rutile, the photocatalytic activity of which under an electric field increased threefold in the process of reduction of CO₂ with water vapor.

Graphical Abstract

查看原文本刊更多论文

电场辅助光催化氧化二氧化钛还原二氧化碳：电场类型和强度的影响

本研究的重点是研究外电场对tio2基材料光催化活性的唯一影响。通常，内置电场用于有效地分离自由能载流子和提高半导体的光催化性能。创造这样的场需要修改光催化剂，改变各种性质，如吸附和光学特性。这些修改使得分离和解释与电场单独相关的促进效应具有挑战性。研究是在气相条件下在一个特制的反应器中进行的，该反应器配备了两个连接到高压的电极，提供高达5.7·103 V/cm的场强。结果表明，电场促进的效果因二氧化钛的结构、吸附和杂质的存在等性质而有显著差异。电场的强度和类型（直流电或交流电）也起决定性作用。金红石对水蒸气还原CO2的促进作用最大，电场作用下金红石的光催化活性提高了3倍。图形抽象

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.