title: Carbonyl-Grafted g-C3N4Porous Nanosheets for Efficient Photocatalytic Hydrogen Evolution.
abstract: Carbonyl-grafted g-C3N4porous 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 melamine-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 O2under 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 (λ>420 nm) the prepared COCNPNS exhibited a superior photocatalytic hydrogen evolution rate of 83.6 μmol h-1, which is 26 times that of the p-CN obtained directly from thermal polycondensation of melamine.
authors.affiliation: School of Chemistry and Chemical Engineering, South China University of Technology, 381 Wushan Road, Guangzhou, 510640, People's Republic of China.
authors.forename: Feng-Yun
authors.initials: FY
authors.lastname: Su
authors.affiliation: School of Chemistry and Chemical Engineering, South China University of Technology, 381 Wushan Road, Guangzhou, 510640, People's Republic of China.
authors.forename: Wei-De
authors.initials: WD
authors.lastname: Zhang
keywords: hydrogen; mesoporous materials; nanostructures; photocatalysis; photochemistry