Rational design of Two-dimensional Binary Polymers from Hetero Triangulenes for Photocatalytic Water Splitting

18 August 2021, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


Based on first principles calculations, we report the design of three two-dimensional (2D) binary honeycomb-kagome polymers composed of B- and N-centered heterotriangulenes with a periodically alternate arrangement as in hexagonal boron nitride. The 2D binary polymers with donor-acceptor characteristics, are semiconductors with a direct band gap of 1.98-2.28 eV. The enhanced in-plane electron conjugation contributes to high charge carrier mobilities for both electrons and holes, about 6.70 and 0.24 × 103 cm2 V-1 s-1, respectively, for the 2D binary polymer with carbonyl bridges (2D CTPAB). With appropriate band edge alignment to match the water redox potentials and pronounced light adsorption for the ultraviolet and visible range of spectra, 2D CTPAB is predicted to be an effective photocatalyst/photoelectrocatalyst to promote overall water splitting.


two-dimensional materials
binary polymers
2D polymers
first-principles calculations
photocatalytic water splitting

Supplementary materials

Supporting Information
Supporting Information with the description of the geometry and electronic properties of 2D binary HT polymers and computational details of the carrier mobilities and thermodynamics of oxygen and hydrogen evolution reactions.


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