Effect of mechanochemical preparation of 2D g-C3N4 on electronic properties and efficiency of photocatalytic hydrogen evolution

• Published in: International journal of hydrogen energy Vol. 44; no. 33; pp. 17922 - 17929
• Main Authors: Posudievsky, Oleg Yu, Kondratyuk, Andrii S., Kozarenko, Olga A., Cherepanov, Vsevolod V., Koshechko, Vyacheslav G., Pokhodenko, Vitaly D.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 05.07.2019
• Subjects: Electronic properties; Graphene-like C3N4; Mechanochemical solventless delamination; Morphology; Photocatalytic hydrogen evolution; Mechanochemical solventless delamination; Graphene-like C3N4; Electronic properties; Photocatalytic hydrogen evolution; Morphology
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2019.05.130

A comparative study of morphology, spectral and photocatalytic properties of graphene-like C3N4 samples prepared by liquid-phase exfoliation of the bulk (l-C3N4) and mechanochemically delaminated g-C3N4 (m-C3N4) was performed for the first time. It was established that the particles of the mechanochemically prepared m-C3N4 are predominantly monolayer whereas the particles of l-C3N4 possess few-layer morphology. It was shown that m-C3N4 exhibits higher photocatalytic activity in the photocatalytic hydrogen evolution from aqueous solution of lactic acid under AM1.5G irradiation due to monolayer morphology, higher reduction potential, as well as more efficient separation and transfer of the photogenerated charges. [Display omitted] •Predominantly monolayer C3N4 was prepared using solventless mechanochemical delamination.•Mechanochemically prepared C3N4 possessed higher reduction potential.•The preparation method improves separation and transfer of the photogenerated charges.•Double increase in the efficiency of the photocatalytic hydrogen evolution was established.