Highly Efficient Visible-Light-Driven Photocatalytic H2Production Using Carbon Particle/g-C3N4Photocatalysts with an Electron Donor
Highly Efficient Visible-Light-Driven Photocatalytic H2Production Using Carbon Particle/g-C3N4Photocatalysts with an Electron Donor
复制标题
使用具有电子供体的碳颗粒/g-C3N4光催化剂高效可见光驱动光催化制氢
DOI：
10.1149/07550.0075ecst
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Kaneco Satoshi
中科院分区：
文献类型：
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作者：
Nakai Yuto;Katsumata Hideyuki;Suzuki Tohru;Kaneco Satoshi
近年来，石墨碳氮化物（g-CN）作为一种有前途的制氢物质引起了人们的关注。然而，g-CN的光催化活性受到其光生载流子的高复合率的限制。因此，有效的电子-空穴分离是提高光催化性能的重要因素。本文以碳颗粒和三聚氰胺为原料，通过简单的两步煅烧法制备了新型碳颗粒/g-CN复合光催化剂（C/Tg-CN）。在可见光照射下（≥ 420 nm），以电子供体为催化剂，考察了合成样品的光催化产氢活性。因此，对于0.5wt.%的最高光催化析氢速率，C/Tg-CN约为340 mol/g· h，是纯g-CN的43倍。这种改进的光催化活性归因于碳颗粒作为电子储存器，其捕获电子以促进电荷分离，以及光收集器，其增强可见光吸收。
Recently, graphitic carbon nitride (g-CN) has attracted attention as a promising hydrogen production substance. However, the photocatalytic activity of g-CN is limited by the high recombination rate of its photogenerated charge carriers. Therefore, effective electron–hole separation is an important factor for enhancing photocatalytic performance. Herein, novel carbon particles/g-CN composite photocatalysts (C/Tg-CN) were prepared by a facile two-step calcination using carbon particles and melamine as starting materials. The photocatalytic activity of the synthesized samples was evaluated for photocatalytic hydrogen production with an electron donor under visible irradiation (≥ 420 nm). Consequently, the highest photocatalytic hydrogen evolution rate for 0.5 wt.% C/Tg-CN was approximately 340 mol/g· h, about 43 times higher than that of pure g-CN. This improved photocatalytic activity was attributed to carbon particles acting as electron reservoirs, which trap electrons to promote charge separation, and light harvesters, which enhance visible-light absorption.