Title: AA- and ABA-stacked carbon nitride (C3N4): novel photocatalytic water splitting solar-to-hydrogen energy conversion
Authors: Al-Jaary, Ali H. Reshak
Citation: AL-JAARY, A. H. R. AA- and ABA-stacked carbon nitride (C3N4): novel photocatalytic water splitting solar-to-hydrogen energy conversion. Physical chemistry chemical physics, 2018, roč. 20, č. 35, s. 22972-22979. ISSN 1463-9076.
Issue Date: 2018
Publisher: Royal Society of Chemistry
Document type: článek
URI: 2-s2.0-85053462867
ISSN: 1463-9076
Keywords in different language: Visible-light;band-structure;electronic-structure;polymorph C3N4;doped G-C3N4;photoreactivity;nanoparticles;nanosheets;evolution;precursor
Abstract in different language: We report the development of the C3N4 structure by integrating two different structures: (i) two identical layers as AAstacked C3N4 and (ii) intercalating one different layer between two identical layers as ABA stacked C3N4. This in turn endows C3N4 with significantly promoted charge migration, up-shifted conduction-band (CB) level, enhanced CB potential from -0.89 eV (AA-stacked C3N4) to -1.03 eV (ABA-stacked C3N4), broadened band gap as well as enhanced surface area, all of which favor the enhancement of the photocatalytic performance. The optical absorption level exhibited significant enhancement in the visible light region when shifting from AA-stacked C3N4 to ABA-stacked C3N4, where the absorption edge moves from = 508.1 = 454.1 nm. This corresponds to the direct optical band gap of 2.44 eV 2.73 eV, which is well matched with the solar spectrum and the sufficient negative CB potential for H+/H-2 reduction. Based on these results, we can conclude that AA-stacked and ABA-stacked C3N4 satisfies all the requirements to be efficient photocatalysts. This study will significantly improve the search efficiency and considerably aid the experimentalists in the exploration of novel photocatalysts.
Rights: Plný text není přístupný.
© Royal Society of Chemistry
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