Graphitic carbon nitride/Cu₂O heterojunctions: Preparation, characterization, and enhanced photocatalytic activity under visible light

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• 作者：Yanlong Tian ; Binbin Chang ; Jie Fu ; Baocheng Zhou ; Jiyang Liu ; Fengna Xi ; Xiaoping Dong ; ^{xpdong@zstu.edu.cn" class="auth_mail} ; ^{xpdongzstu@gmail.com" class="auth_mail}
• 关键词：Semiconductor ; Photocatalysis ; Heterojunctions ; Graphitic carbon nitride ; Cu2O
• 刊名：Journal of Solid State Chemistry
• 出版年：April, 2014
• 年：2014
• 卷：212
• 期：Complete
• 页码：1-6
• 全文大小：2036 K

文摘

As a metal-free semiconductor material, graphitic carbon nitride (C₃N₄), the high recombination rate of photogenerated charges and insufficient sunlight absorption limit its solar-based photocatalytic activity. Here, we reported the heterojunctions of C₃N₄-Cu₂O with a p-n junction structure, which was synthesized by a hydrothermal method. The HR-TEM result revealed an intimate interface between C₃N₄ and Cu₂O in the heterojunction, and UV-vis diffuse reflection spectra showed their extended spectral response in the visible region compared with pure C₃N₄. These excellent structural and spectral properties, as well as p-n junction structures, endowed the C₃N₄-Cu₂O heterojunctions with enhanced photocatalytic activities. The possible photocatalytic mechanism that photogenerated holes as the mainly oxidant species in photocatalysis was proposed base on the trapping experiments.