Facile One-Step Synthesis of Hybrid Graphitic Carbon Nitride and Carbon Composites as High-Performance Catalysts for CO2 Photocatalytic Conversion

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• 作者：Yangang Wang ; Xia Bai ; Hengfei Qin ; Fei Wang ; Yaguang Li ; Xi Li ; Shifei Kang ; Yuanhui Zuo ; Lifeng Cui
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：July 13, 2016
• 年：2016
• 卷：8
• 期：27
• 页码：17212-17219
• 全文大小：594K
• 年卷期：0
• ISSN：1944-8252

文摘

Utilizing and reducing carbon dioxide is a key target in the fight against global warming. The photocatalytic performance of bulk graphitic carbon nitride (g-C₃N₄) is usually limited by its low surface area and rapid charge carrier recombination. To develop g-C₃N₄ more suitable for photocatalysis, researchers have to enlarge its surface area and accelerate the charge carrier separation. In this work, novel hybrid graphitic carbon nitride and carbon (H-g-C₃N₄/C) composites with various carbon contents have been developed for the first time by a facile one-step pyrolysis method using melamine and natural soybean oil as precursors. The effect of carbon content on the structure of H-g-C₃N₄/C composites and the catalytic activity for the photoreduction of CO₂ with H₂O were investigated. The results indicated that the introduction of carbon component can effectively improve the textural properties and electronic conductivity of the composites, which exhibited imporved photocatalytic activity for the reduction of CO₂ with H₂O in comparison with bulk g-C₃N₄. The highest CO and CH₄ yield of 22.60 μmol/g-cat. and 12.5 μmol/g-cat., respectively, were acquired on the H-g-C₃N₄/C-6 catalyst with the carbon content of 3.77 wt % under 9 h simulated solar irradiation, which were more than twice as high as that of bulk g-C₃N₄. The remarkably increased photocatalytic performance arises from the synergistic effect of hybrid carbon and g-C₃N₄.