Exploring the role of electronic structure on photo-catalytic behavior of carbon-nitride polymorphs
- Univ. of Calcutta, Kolkata (India); Lady Brabourne College, Kolkata (India)
- Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
- Univ. of Calcutta, Kolkata (India)
- Lady Brabourne College, Kolkata (India)
- Indian Inst. of Technology, Kanpur (India)
- S.N. Bose National Centre for Basic Sciences, Salt Lake City, Kolkata (India)
A fully self-consistent density-functional theory (DFT) with improved functionals is used herein 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.
- Research Organization:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
- Grant/Contract Number:
- AC02-07CH11358
- OSTI ID:
- 1617025
- Alternate ID(s):
- OSTI ID: 1691841
- Report Number(s):
- IS-J--10,194
- Journal Information:
- Carbon, Journal Name: Carbon Vol. 168; ISSN 0008-6223
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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