Three-dimensional porous g-C3N4 for highly efficient photocatalytic overall water splitting
Three-dimensional porous g-C3N4 for highly efficient photocatalytic overall water splitting
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三维多孔 g-C3N4 用于高效光催化整体水分解
DOI：
10.1016/j.nanoen.2019.03.010
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发表时间：
2019-05-01
期刊：
影响因子：
17.6
通讯作者：
Zhang, Tierui
中科院分区：
文献类型：
--
作者：
Chen, Xianjie;Shi, Run;Zhang, Tierui
本文构建了一种由高结晶和超薄纳米片组装而成的三维多孔石墨氮化碳（3D g-C3N4NS）。3D g- c3n4ns可以直接将纯水分解成h -2和O-2，在可见光下的析出速率分别高达101.4和49.1 mu mol g(-1) h(-1)，是体g- c3n4和g- c3n4ns的11.8和5.1倍。此外，它在420 nm处的表观量子产率为1.4%，明显优于先前报道的Pt/g-C3N4。3D g-C3N4NS的高效活性主要归功于其三维互联的开放框架，由高度结晶的超薄纳米片单元组装而成，为更快的载流子传输提供了途径。此外，3D g-C3N4NS具有防止纳米片团聚的三维结构，在整体水裂解反应中保持100 h以上的稳定性。
Herein, this work constructs a three-dimensional porous graphitic carbon nitride assembled by highly crystalline and ultrathin nanosheets (3D g-C3N4NS). 3D g-C3N4NS could directly split pure water into H-2 and O-2 with high evolution rate up to 101.4 and 49.1 mu mol g(-1) h(-1) under visible light, respectively, approximately 11.8 and 5.1 times higher than bulk g-C3N4 and g-C3N4NS. Besides, it achieves a notable apparent quantum yield of 1.4% at 420 nm, significantly superior to previously reported Pt/g-C3N4. The efficient activity of 3D g-C3N4NS is mainly attributed to its 3D interconnected open-framework, assembled by highly crystalline ultrathin nanosheet unit, provides a pathway for faster charge carrier transport. Moreover, benefitting from its 3D structure for preventing agglomeration of nanosheets, 3D g-C3N4NS is stable for more than 100 h of overall water splitting reaction.