Carbonyl-Grafted g-C3N4 Porous Nanosheets for Efficient Photocatalytic Hydrogen Evolution

被引：43

作者：

Su, Feng-Yun ^{[1
]}

Zhang, Wei-De ^{[1
]}

机构：

[1] South China Univ Technol, Sch Chem & Chem Engn, 381 Wushan Rd, Guangzhou 510640, Guangdong, Peoples R China

来源：

CHEMISTRY-AN ASIAN JOURNAL | 2017年 / 12卷 / 05期

基金：

中国国家自然科学基金;

关键词：

hydrogen; mesoporous materials; photocatalysis; photochemistry; nanostructures; TEMPLATE-FREE SYNTHESIS; ONE-POT SYNTHESIS; VISIBLE-LIGHT; H-2; EVOLUTION; PHOTOELECTROCHEMICAL ACTIVITY; NITRIDE STRUCTURE; WATER; SEMICONDUCTORS; TRANSITIONS; ACTIVATION;

D O I：

10.1002/asia.201601518

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Carbonyl-grafted g-C3N4 porous nanosheets (COCNPNS) were fabricated by means of a two-step thermal process using melamine and oxalic acid as starting reagents. The combination of melamine with oxalic acid to form a mel-amine-oxalic acid supramolecule as a precursor is key to synthesizing carbonyl-grafted g-C3N4. The bulk carbonyl-grafted g-C3N4 (COCN) was further thermally etched onto porous nanosheets by O-2 under air. In such a process, the carbonyl groups were partly removed and the obtained sample showed remarkably enhanced visible-light harvesting and promoted the separation and transfer of photogenerated electrons and holes. With its unique porous structure and enhanced light-harvesting capability, under visible-light illumination (lambda>420 nm) the prepared COCNPNS exhibited a superior photocatalytic hydrogen evolution rate of 83.6 mu molh(-1), which is 26 times that of the p-CN obtained directly from thermal polycondensation of melamine.

引用

页码：515 / 523

页数：9

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