Salt-assisted synthesis of 3D open porous g-C3N4 decorated with cyano groups for photocatalytic hydrogen evolution
Salt-assisted synthesis of 3D open porous g-C3N4 decorated with cyano groups for photocatalytic hydrogen evolution
复制标题
盐辅助合成氰基修饰的 3D 开孔 g-C3N4 用于光催化析氢
DOI：
10.1039/c7nr05927b
复制
发表时间：
2018-02-14
期刊：
影响因子：
6.7
通讯作者：
Shi, Chunsheng
中科院分区：
文献类型：
--
作者：
Chen, Zhangfa;Lu, Shangchen;Shi, Chunsheng
采用氯化钠辅助冷冻干燥与煅烧相结合的两步法制备了三维氰基开放多孔石墨氮化碳（3D OPG-C3N4-CN）。NaCl不仅作为三维开孔结构的模板，而且在一定程度上促进了g-C3N4在500℃左右的分解。同时，在g-C3N4三维多孔材料的形成过程中，在其边缘引入了适量的氰基作为电子捕获中心。与没有NaCl辅助的g-C3N4相比，3D OPG-C3N4-CN具有更好的光吸收，更少的载流子重组和更多的活性位点。结果表明，Pt作为助催化剂时，3D OPG-C3N4-CN的产氢量达到1590 μ mol h(-1) g(-1)，是本体g- c3n4产氢量的6倍左右。
Three-dimensional open porous graphitic carbon nitride with cyano groups (3D OPG-C3N4-CN) has been fabricated by a facile two-step process that combines NaCl-assisted freeze-drying with calcination. NaCl not only works as a template for the 3D open porous structure, but also facilitates the decomposition of g-C3N4 around 500 degrees C to some extent. Meanwhile, a moderate amount of cyano groups acting as electron capture centers are introduced at the edge of the 3D open porous g-C3N4 during the formation process. Compared with bulk g-C3N4 without NaCl assistance, the 3D OPG-C3N4-CN exhibits improved light absorption, reduced carrier recombination and more active sites. As a result, the enhanced hydrogen production of 3D OPG-C3N4-CN reaches up to 1590 mu mol h(-1) g(-1) when using Pt as a cocatalyst, which is about six times as much as that of the bulk g-C3N4.