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Theoretically modelling graphene-like carbon matryoshka with strong stability and particular three-center two-electron π bonds

Authors :
Zhibin Gao
Yaoxiao Zhao
Kun Yuan
Mengyang Li
Xiang Zhao
Source :
Physical Chemistry Chemical Physics. 23:11907-11916
Publication Year :
2021
Publisher :
Royal Society of Chemistry (RSC), 2021.

Abstract

Carbon materials based on different hybridization of carbon atoms have drawn great attention because of their unique configurations and physical and chemical properties. Here, a previously unknown 2D carbon allotrope named L-2Gy, graphene-like carbon matryoshka graphynes (Gy) with two alkynyls (C[triple bond, length as m-dash]C) inserted into the three-fold carbon atoms of graphene, has been constructed with considerable thermal, dynamical, and mechanical stability by using ab initio density functional theory. With the increasing number of alkynyls between the three-fold carbon atoms of graphene, the stability of Gy will seriously decrease. L-2Gy has a fascinating chemical bond environment consisting of sp- and sp2-hybridized carbon atoms, and delocalized π electrons derived from the 27 three-center two-electron π bonds. This particular electronic structure plays a vital role in chemically stabilizing L-2Gy. The electronic band structure reveals the semi-metallic features of L-2Gy mainly contributed by the px/z orbitals of carbon atoms. Furthermore, compared with the acknowledged catalysts for the hydrogen evolution reaction (HER), L-2Gy, as a 2D carbon allotrope, shows excellent catalytic activity for the HER.

Details

ISSN :
14639084 and 14639076
Volume :
23
Database :
OpenAIRE
Journal :
Physical Chemistry Chemical Physics
Accession number :
edsair.doi.dedup.....2033ffb1a8c7993ac6eb498aaf7bb15c