Chemical and Biological Engineering, Materials Science and Engineering, Physics and Astronomy, Ames Laboratory
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A fully self-consistent density-functional theory (DFT) with improved functionals is used to provide a comprehensive account of structural, electronic, and optical properties of C3N4 polymorphs. Using our recently developed van Leeuwen-Baerends (vLB) corrected local-density approximation (LDA), we implemented LDA + vLB within full-potential Nth-order muffin-tin orbital (FP-NMTO) method and show that it improves structural properties and band gaps compared to semi-local functionals (LDA/GGA). We demonstrate that the LDA + vLB predicts band-structure and work-function for well-studied 2D-graphene and bulk-Si in very good agreement with experiments, and more exact hybrid functional (HSE) calculations as implemented in the Quantum-Espresso (QE) package. The structural and electronic-structure (band gap) properties of C3N4 polymorphs calculated using FP-NMTO-LDA + vLB is compared with more sophisticated hybrid-functional calculations. We also perform detailed investigation of photocatalytic behavior using QE-HSE method of C3N4 polymorphs through work-function, band (valence and conduction) position with respect to water reduction and oxidation potential. Our results show γ-C3N4 as the best candidate for photocatalysis among all the C3N4 polymorphs but it is dynamically unstable at ‘zero’ pressure. We show that γ-C3N4 can be stabilized under hydrostatic-pressure, which improves its photocatalytic behavior relative to water reduction and oxidation potentials.
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Datta, Sujoy; Singh, Prashant; Jana, Debnarayan; Chaudhuri, Chhanda B.; Harbola, Manoj K.; Johnson, Duane D.; and Mookerjee, Abhijit, "Exploring the role of electronic structure on photo-catalytic behavior of carbon-nitride (C3N4) polymorphs" (2020). Materials Science and Engineering Publications. 342.