Effect of graphitic carbon nitride microstructures on the activity and selectivity of photocatalytic CO2 reduction under visible light
Effect of graphitic carbon nitride microstructures on the activity and selectivity of photocatalytic CO2 reduction under visible light
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DOI：
10.1039/c3cy20822b
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发表时间：
2013-01-01
影响因子：
5
通讯作者：
Zan, Ling
中科院分区：
文献类型：
--
作者：
Mao, Jin;Peng, Tianyou;Zan, Ling
采用尿素和三聚氰胺热解法合成了两种石墨氮化碳（g-C3N4）。结果表明，所得的g-C3N4作为光催化剂，在可见光下可将CO2还原为有机燃料，并对CH3OH和C2H5OH的生成表现出不同的光活性和选择性。由尿素衍生的产物（记为u-g-C3N4）具有介孔片状结构，比由三聚氰胺衍生的无孔片状产物（记为m-g-C3N4）具有更大的表面积和更高的光还原活性。此外，使用u-g-C3N4作为光催化剂可以形成含有CH3OH和C2H5OH的混合物，而m-g-C3N4只能导致C2H5OH的选择性形成。这一有趣的发现对设计高效、环保、方便的光催化剂及其光反应性的调整在可持续光能转换领域具有重要意义。
Two kinds of graphitic carbon nitride (g-C3N4) were synthesized through a pyrolysis process of urea or melamine. It is found that the obtained g-C3N4, as photocatalysts, can reduce CO2 to organic fuels under visible light, and exhibit different photoactivity and selectivity on the formation of CH3OH and C2H5OH. The product derived from the urea (denoted as u-g-C3N4) shows a mesoporous flake-like structure with a larger surface area and higher photoactivity for the CO2 reduction than the non-porous flaky product obtained from melamine (denoted as m-g-C3N4). Moreover, using u-g-C3N4 as a photocatalyst can result in the formation of a mixture containing CH3OH and C2H5OH, while m-g-C3N4 only leads to the selective formation of C2H5OH. The present interesting findings could shed light on the design of efficient, eco-friendly and convenient photocatalysts and the tuning of their photoreactivity in the field of sustainable light-to-energy conversion.