Computational Study Based Prediction of New Photocatalysts for water splitting by systematic manipulation of MXene surfaces
Journal of Materials Chemistry C(2024)
摘要
The compositional and structural flexibility of functionalised
two-dimensional metal carbonitrides or MXenes has been exploited through a
combinatorial search for new materials that can act as catalysts for
photo-assisted water splitting by absorbing sunlight with energy in the
infra-red region. Detailed calculations on 49 Janus MXenes where two surfaces
are of asymmetric nature are carried out by first-principles Density Functional
Theory. A screening procedure is adopted to arrive at potential candidates. Our
calculations predict four new materials whose surfaces can activate both
hydrogen and oxygen evolution reactions upon splitting water, two out of which
are infra-red active, and the rest are visible light-active. We have performed
a detailed microscopic analysis to find out the interrelations of the
structural model of surface functionalisation, the chemistry of the surfaces,
the electronic structure, and the alignment of bands with respect to the
reaction potentials that explain our results. Apart from these four compounds,
we find thirteen other compounds that are suitable for either hydrogen
evolution or oxygen reduction reactions. This study lays out a guideline for
the systematic discovery of potential new catalysts for water splitting under
sunlight irradiation.
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