Ultrathin Graphitic Carbon Nitride Nanosheets for Photocatalytic Hydrogen Evolution,ACS Applied Nano Materials

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Ultrathin Graphitic Carbon Nitride Nanosheets for Photocatalytic Hydrogen Evolution
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-01-13 , DOI: 10.1021/acsanm.9b02590
Jian-Hua Zhang ₁ , Mei-Juan Wei ₁ , Zhang-Wen Wei ₁ , Mei Pan ₁ , Cheng-Yong Su ₁

Affiliation

Among semiconductor photocatalysts, graphite carbon nitride (g-C₃N₄) has caused great concern in terms of water splitting. Here, we prepared ultrathin g-C₃N₄ nanosheets with high photocatalytic activity by recrystallization of urea from N,N-dimethylformamide (DMF) to form a hydrogen-bonding network (named as UDF) and then utilized the as-prepared complex for the synthesis of carbon nitride. Single-crystal X-ray diffraction showed that urea and DMF form a 3:1 solvate in the UDF precursor, which manifests an extended three-dimensional hydrogen-bonding network. Then one-step thermal polycondensation of the UDF yields a nanosheet morphology with a reduced thickness of 4.0 nm, an enlarged surface area, and improved optical absorption, which results in a high rate of photocatalytic hydrogen evolution (2.5 × 10^–4 mol h^–1) under the irradiation of visible light. It is foreseen that the facile method herein provides an alternative research approach for the synthesis of carbon nitride materials with versatile morphologies and structures for solar energy conversion.

中文翻译：

超薄石墨烯氮化碳纳米片用于光催化制氢

在半导体光催化剂中，石墨碳氮化物（gC ₃ N ₄）引起了水分解方面的极大关注。在这里，我们通过尿素从N，N的重结晶制备了具有高光催化活性的超薄gC ₃ N ₄纳米片。-二甲基甲酰胺（DMF）形成氢键网络（命名为UDF），然后利用所制备的配合物来合成氮化碳。X射线单晶衍射表明，尿素和DMF在UDF前体中形成3：1的溶剂化物，表现出扩展的三维氢键网络。然后，UDF的一步热缩聚反应可形成纳米片形态，厚度减小至4.0 nm，表面积增大，光吸收率提高，从而导致光催化氢释放速率高（2.5×10 ^–4 mol h ^{– 1个}）在可见光的照射下。可以预见的是，本文中的简便方法为合成具有用于太阳能转换的多种形态和结构的氮化碳材料提供了另一种研究方法。

更新日期：2020-01-14

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