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High-efficiency photocatalytic water splitting by a N-doped porous g-C3N4 nanosheet polymer photocatalyst derived from urea and N,N-dimethylformamide
Inorganic Chemistry Frontiers ( IF 7 ) Pub Date : 2020-03-11 , DOI: 10.1039/d0qi00117a
Feng Guo 1, 2, 3, 4 , Lijing Wang 5, 6, 7, 8, 9 , Haoran Sun 1, 2, 3, 4 , Mingyang Li 2, 3, 4, 10 , Weilong Shi 2, 3, 4, 10
Affiliation  

In this work, layered N-doped graphitic carbon nitride (g-C3N4) porous nanosheets were successfully prepared by mixing the precursor of N,N-dimethylformamide (DMF) and urea through a simple one-step thermal copolymerization method. The doped-N plays a significant role in modifying the chemical and electronic structure of g-C3N4, which can decrease the migration pathway of the charges and suppress the recombination of the photogenerated carriers based on experimental characterization data and the density functional theory (DFT) calculation results. Through nanostructure engineering design, the as-prepared photocatalyst exhibits promoted specific surface area and enhanced light absorption capacity. Consequently, the as-prepared N-doped porous g-C3N4 nanosheets yield about 14 times higher H2 evolution rate than pristine g-C3N4 nanosheets under visible light irradiation. The present study provides a simple and convenient method of nanostructure engineering for the synthesis of modified g-C3N4 with excellent photocatalytic activity to meet the sustainable demand of energy.

中文翻译:

尿素和N,N-二甲基甲酰胺衍生的N掺杂多孔g-C3N4纳米片状聚合物光催化剂的高效光催化水分解

在这项工作中,通过简单的一步热共聚方法将NN-二甲基甲酰胺(DMF)和尿素的前体混合,成功地制备了层状的N掺杂石墨氮化碳(gC 3 N 4)多孔纳米片。掺杂的N在改变gC 3 N 4的化学和电子结构中起重要作用根据实验表征数据和密度泛函理论(DFT)的计算结果,可以减少电荷的迁移途径并抑制光生载流子的重组。通过纳米结构工程设计,所制备的光催化剂显示出提高的比表面积和增强的光吸收能力。因此,在可见光照射下,所制备的N掺杂的多孔gC 3 N 4纳米片产生的H 2释放速率是原始gC 3 N 4纳米片的约14倍。本研究为合成修饰的gC 3 N 4提供了一种简便的纳米结构工程方法 具有出色的光催化活性,可以满足能源的可持续需求。
更新日期:2020-04-24
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