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|Title:||Carbon nanodot decorated graphitic carbon nitride: new insights into the enhanced photocatalytic water splitting from ab initio studies|
|Citation:||Physical Chemistry Chemical Physics, 2015; 17(46):31140-31144|
|Publisher:||Royal Society of Chemistry|
|Guoping Gao, Yan Jiao, Fengxian Ma, Yalong Jiao, Eric Waclawik and Aijun Du|
|Abstract:||Interfacing carbon nanodots (C-dots) with graphitic carbon nitride (g-C3N4) produces a metal-free system that has recently demonstrated significant enhancement of photo-catalytic performance for water splitting into hydrogen [Science, 2015, 347, 970-974]. However, the underlying photo-catalytic mechanism is not fully established. Herein, we have carried out density functional theory (DFT) calculations to study the interactions between g-C3N4 and trigonal/hexagonal shaped C-dots. We find that hybrid C-dots/g-C3N4 can form a type-II van der Waals heterojunction, leading to significant reduction of band gap. The C-dot decorated g-C3N4 enhances the separation of photogenerated electron and hole pairs and the composite's visible light response. Interestingly, the band alignment of C-dots and g-C3N4 calculated by the hybrid functional method indicates that C-dots act as a spectral sensitizer in hybrid C-dots/g-C3N4 for water splitting. Our results offer new theoretical insights into this metal-free photocatalyst for water splitting.|
|Rights:||This journal is © the Owner Societies 2015|
|Appears in Collections:||Mechanical Engineering reports|
Mechanical Engineering publications
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