g-C3N4/Ti-defective TiO2 p-n heterojunction to improve the photocatalytic CO2 reduction activity

IF 4.4 3区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Inorganic Chemistry Communications Pub Date : 2025-03-30 DOI:10.1016/j.inoche.2025.114453

Wen Liang, Yanqiu Yang, Zhiyu Liu, MeiXia Zhang, Lingru Kong, Peng Song

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引用次数: 0

Abstract

Since its artificial synthesis, graphitic carbon nitride (g-C₃N₄) has exhibited extensive applicability across the realm of photocatalysis, showcasing its versatility and potential as a key material in this field. However, g-C₃N₄ also has some drawbacks such as a smaller specific surface area, lower quantum efficiency, and faster electron-hole recombination rate, improving its photocatalytic efficiency remains a research question worth exploring. This paper successfully prepared g-C₃N₄/Ti-Defected TiO₂ p-n heterojunction composite materials and tested their activity in photocatalytic CO₂ reduction. We constructed Ti-Defected TiO₂ with p-type conductivity to improve its band structure and augment the quantity of active sites within the reaction environment. These sites, endowed with the capability to facilitate the reduction of carbon dioxide, are pivotal in optimizing the overall performance of the photocatalytic process. The establishment of p-n heterojunctions has induced the generation of an inherent electric field, efficacious in mitigating the undesirable recombination phenomenon between electrons and holes. This suppression mechanism is pivotal in enhancing the separation efficiency of charge carriers, thereby fostering the overall performance of photocatalytic reactions.

It can be seen from the results that under visible light irradiation, when the mass ratio of g-C₃N₄ to Ti-deficient TiO₂ precursors is 1.1:2 (performed the reaction with 1.1 g g-C₃N₄, 30 ml of glycerol, 60 ml of ethanol, and 2 g of tetrabutyl titanate), the CO generation rate of the composite photocatalytic materials can reach 11.28 μmol h⁻¹ g⁻¹, which is 3.8 times that of g-C₃N₄ and 4.1 times that of Ti-deficient TiO₂. The results of this study are of great significance for the strategic design of g-C₃N₄-based heterogeneous photocatalysts, providing valuable insights and guidance for optimizing their structural and functional properties.

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来源期刊

Inorganic Chemistry Communications 化学-无机化学与核化学

CiteScore

5.50

自引率

7.90%

发文量

1013

审稿时长

53 days

期刊介绍： Launched in January 1998, Inorganic Chemistry Communications is an international journal dedicated to the rapid publication of short communications in the major areas of inorganic, organometallic and supramolecular chemistry. Topics include synthetic and reaction chemistry, kinetics and mechanisms of reactions, bioinorganic chemistry, photochemistry and the use of metal and organometallic compounds in stoichiometric and catalytic synthesis or organic compounds.