Photo-electrochemical study of TiO2/Co3O4 thin films in polluted electrolyte: A promising route for coupling hydrogen production with water remediation

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL International Journal of Hydrogen Energy Pub Date : 2024-09-26 DOI:10.1016/j.ijhydene.2024.09.287

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Abstract

The use of a photo-electrochemical cell (PEC) to produce hydrogen from wastewater is a promising innovation. In this context, this study investigates the impact of a pollutant on the photo-electrochemical properties of sol-gel synthesized TiO₂ and TiO₂–Co₃O₄ thin films for hydrogen production in a polluted electrolyte. Combining the photocatalytic properties of TiO₂ with the electronic properties of Co₃O₄ offers an effective solution for achieving effective photo-electrochemical properties in polluted environments. Nevertheless, despite the lowest photocatalytic activity, the hybrid thin film TiO₂–Co₃O₄ with the highest Ti/Co ratio (1:0.5) shows the most promising performance with simultaneous 11.4 μmol cm⁻² h⁻¹ H₂ production and 12% acid orange 7 degradation after 3 h irradiation under xenon light without the use of any sacrificial agent. This indicates that the electronic conductivity provided by the presence of Co₃O₄ is a critical property for achieving optimal performance in PEC coupling for hydrogen production and wastewater treatment.

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污染电解质中 TiO2/Co3O4 薄膜的光电化学研究：制氢与水修复相结合的可行途径

利用光电化学电池（PEC）从废水中制氢是一项前景广阔的创新技术。在此背景下，本研究调查了污染物对溶胶凝胶合成的 TiO2 和 TiO2-Co3O4 薄膜的光电化学特性的影响，以便在受污染的电解液中制氢。将 TiO2 的光催化特性与 Co3O4 的电子特性相结合，为在污染环境中实现有效的光电化学特性提供了一种有效的解决方案。尽管如此，尽管 TiO2-Co3O4 的光催化活性最低，但 Ti/Co 比率最高（1:0.5）的 TiO2-Co3O4 混合薄膜显示出最有前途的性能，在氙灯照射下 3 小时后，无需使用任何牺牲剂，即可同时产生 11.4 μmol cm-2 h-1 的 H2 和降解 12% 的酸性橙 7。这表明，Co3O4 的存在所提供的电子传导性是实现 PEC 耦合制氢和废水处理最佳性能的关键特性。

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来源期刊

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.