Polycondensation of thiourea into carbon nitride semiconductors as visible light photocatalysts
Polycondensation of thiourea into carbon nitride semiconductors as visible light photocatalysts
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硫脲缩聚成氮化碳半导体作为可见光光催化剂
DOI：
10.1039/c2jm00097k
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发表时间：
2012-01-01
影响因子：
--
通讯作者：
Wang, Xinchen
中科院分区：
文献类型：
--
作者：
Zhang, Guigang;Zhang, Jinshui;Wang, Xinchen
通过水分解将太阳能转化为氢气被认为是解决全球能源和环境问题的长期解决方案。为了以经济有效的方式有效地捕获、转换和储存太阳能，人们已经付出了巨大的努力来寻找丰富的系统。为了进一步推进新近发展的氮化碳光催化太阳能制氢，硫脲（一种含硫化合物）被用作合成石墨氮化碳半导体的廉价和容易获得的起始材料。对所制备的光催化剂进行了多种表征，结果表明，加热温度和硫基序的存在为控制氮化碳的缩聚提供了一个简单的化学途径，从而调节了它们的织构和电子性能。光催化活性实验表明，由硫脲合成的g-C3N4的H-2产率远高于由双氰酰胺或尿素制备的g-C3N4，并且通过提高缩合温度可以进一步增强其活性。
Converting solar energy into hydrogen gas by water splitting is considered as a long-term solution to address global energy and environmental problems. Great effort has been devoted to the search for abundant systems for the purpose of efficient capture, conversion, and storage of solar energy in a cost-effective manner. To further advance the recently-developed carbon nitride photocatalysis for solar hydrogen generation, thiourea, a sulfur-containing compound, was used as a cheap and easily-available starting material for the synthesis of graphitic carbon nitride semiconductors. The as-prepared photocatalysts were subjected to several characterizations, and the results showed that the heating temperature and the presence of sulfur motifs offer a facile chemical pathway for the control of the condensation/polymerization of carbon nitride, and thus adjusting their textural and electronic properties. Photocatalytic activity experiments demonstrated that the g-C3N4 synthesized from thiourea exhibited a much higher H-2 production rate than that of g-C3N4 prepared from dicyanamide or urea, and this activity can be further enhanced by increasing the condensation temperature.