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Exploring the role of electronic structure on photo-catalytic behavior of carbon-nitride polymorphs

Journal Article · · Carbon
 [1];  [2];  [3];  [4];  [5];  [2];  [6]
  1. Univ. of Calcutta, Kolkata (India); Lady Brabourne College, Kolkata (India)
  2. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
  3. Univ. of Calcutta, Kolkata (India)
  4. Lady Brabourne College, Kolkata (India)
  5. Indian Inst. of Technology, Kanpur (India)
  6. 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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