Synthesis of bulk and nanoporous carbon nitride polymers from ammonium thiocyanate for photocatalytic hydrogen evolution
Synthesis of bulk and nanoporous carbon nitride polymers from ammonium thiocyanate for photocatalytic hydrogen evolution
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从硫氰酸铵合成块状和纳米多孔氮化碳聚合物用于光催化析氢
DOI：
10.1039/c1jm11961c
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发表时间：
2011-01-01
影响因子：
--
通讯作者：
Wang, Xinchen
中科院分区：
文献类型：
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作者：
Cui, Yanjuan;Zhang, Jinshui;Wang, Xinchen
以硫氰酸铵为前驱体通过直接热聚合合成了石墨相氮化碳。将这种简单的热诱导聚合转移到具有各种纳米结构的硬模板上，能够通过软化学合成制备纳米结构的氮化碳，同时反应级联中硫物种的参与为织构和电子结构提供了额外的化学控制。对催化剂进行了多项表征，所得结果表明，通过纳米二氧化硅和SBA - 15模板可以获得纳米多孔氮化碳。在可见光下对质子溶液析氢的光催化活性进行了评估。结果表明，与由双氰胺获得的g - C3N4相比，由硫氰酸铵合成的g - C3N4表现出更高的光活性。通过在g - C3N4中构建纳米结构，活性得到了进一步提高。这是由于获得了有利于光捕获和传质的增大的表面积，以及氧化还原电位的提高。
Graphitic carbon nitride was synthesized by direct thermal polymerization of ammonium thiocyanate as the precursor. The transfer of this simple thermal-induced polymerization onto hard-templates with various nanoarchitectures enables the fabrication of nanostructured carbon nitridesvia a soft-chemical synthesis, while the involvement of a sulfur species within the reaction cascade offers additional chemical control of the texture and the electronic structures. The catalysts were subjected to several characterizations, and the results obtained revealed that nanoporous carbon nitrides can be obtained by templating with nanosized silica and SBA-15. Photocatalytic activity was evaluated toward hydrogen evolution from proton solution with visible light. Results show that g-C3N4 synthesized from ammonium thiocyanate exhibited improved photoactivity in comparison with g-C3N4 obtained from dicyandiamide. Further improvement in the activity was achieved by creating the nanostructures in g-C3N4. This is due to the enhanced surface area obtained which is favorable for light-harvesting and mass-transfer, as well as to the increased redox potential.