Improved Photocatalytic H2 Evolution over G-Carbon Nitride with Enhanced In-Plane Ordering.
Improved Photocatalytic H2 Evolution over G-Carbon Nitride with Enhanced In-Plane Ordering.
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DOI：
10.1002/smll.201602136
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发表时间：
2016-09
期刊：
影响因子：
13.3
通讯作者：
Guixia Zhao;Guigao Liu;Hong Pang;Huimin Liu;Huabin Zhang;Kun Chang;Xianguang Meng;Xiaojun Wang;Jinhua Ye
中科院分区：
文献类型：
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作者：
Guixia Zhao;Guigao Liu;Hong Pang;Huimin Liu;Huabin Zhang;Kun Chang;Xianguang Meng;Xiaojun Wang;Jinhua Ye
首次以水合七嗪为前驱体，通过自组装制备了一系列具有增强面内有序性的棒状多孔石墨-碳氮化物（简称CNs）。通过控制预成型前驱体的不同升温速率煅烧，（SAHEP-CNs-1）具有最有序和最少堆叠的石墨平面，在可见光下的析氢速率为420 μmol h-1，在420 nm处的表观量子效率为8.9%。这是文献中C3 N4相关光催化剂的最高值之一。本工作揭示了增强面内有序性是改善氮化碳光催化析氢性能的关键因素之一，这是通过加速石墨平面内的电荷传输和分离来延长载流子寿命的有效解决方案。这一发现将为设计高效的有机半导体器件提供一种表面策略。
A series of rod-like porous graphitic-carbon nitrides (short as CNs) with enhanced in-plane ordering have been fabricated through self-assembled heptazine hydrate precursors for the first time. By controlling the calcination of the preformed precursors with different temperature-rising rates, the resulted CNs (SAHEP-CNs-1) with the most ordered and least stacked graphitic planar are showing a tremendously improved hydrogen evolution rate of 420 μmol h-1 under visible light and a remarkable apparent quantum efficiency of 8.9% at 420 nm, which is among the highest values for C3 N4 -related photocatalysts in the literature. This work discloses that enhancing in-plane ordering is one critical factor for improving the photocatalytic H2 evolution of carbon nitride, which is an effective solution to prolong the lifetime of charge carriers by accelerating the charge transport and separation within the graphitic planar. This finding would present a facial strategy for the designing of efficient organic semiconductors for photocatalysis.