纳米片
光催化
煅烧
氮化物
氮化碳
材料科学
图层(电子)
石墨氮化碳
碳纤维
化学工程
分解水
纳米技术
可见光谱
化学
复合材料
光电子学
催化作用
有机化学
复合数
工程类
作者
Quanhao Shen,Naixu Li,Rehana Bibi,Richard Ngulube,Maochang Liu,Jiancheng Zhou,Dengwei Jing
标识
DOI:10.1016/j.apsusc.2020.147104
摘要
Carbon nitride nanosheets have shown a great promise for photocatalytic water splitting among numerous photocatalysts due to the versatile advantages. The crucial issues of the weak visible-light absorption and the separation of photo-generated carrier remain a matter of serious concern. Herein, we report a facile calcination-solvothermal-calcination method to prepare nitrogen-deficient carbon nitride nanosheets (DCNS) for the first time, which leads to the simultaneous introduction of nitrogen defects and formation of a fragmented few-layer nanosheet structure. The fragmented few-layer nanosheet structure is known to possess a high specific surface area and abundant interfacial reaction sites, contributing to the rapid consumption of photo-generated carrier. The nitrogen defects are responsible for further boosting the photocatalytic performance by regulating the band structure and optical properties as well as improving the separation efficiency of photo-generated carrier. The optimized DCNS-120 delivers a superior H2 production rate of 5375 μmol·g−1·h−1, considerably higher than that of bulk carbon nitride (164 μmol·g−1·h−1). We anticipate that this work may pave a new pathway to engineering carbon nitride with a matched structure to achieve the desired efficient photocatalytic H2 production under visible-light irradiation.
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