Abstract
<p class="TTPKeywords">We have performed DFT calculations of electronic structure, optical properties and photocatalytic potential of the low-index surfaces of CuO. Photocatalytic reaction on the surface of semiconductor requires the appropriate band edge of the semiconductor surface to drive redox reactions. The calculation begins with the electronic structure of bulk system; it aims to determine realistic input parameters and band gap prediction. CuO is an antiferromagnetic material with strong electronic correlations, so that we have applied DFT + U calculation with spin polarized approach, beside it, we also have used GW approximation to get band gap correction. Based on the input parameters obtained, then we calculate surface energy, work function and band edge of the surfaces based on a framework developed by Bendavid et al (J. Phys. Chem. B, 117, 15750-15760) and then they are aligned with redox potential needed for water splitting and CO<sub>2</sub> reduction. Based on the calculations result can be concluded that not all of low-index CuO have appropriate band edge to push reaction of water splitting and CO2 reduction, only the surface CuO(111) and CuO(011) which meets the required band edge. Fortunately, based on the formation energy, CuO(111) and CuO(011) is the most stable surface. The last we calculate electronic structure and optical properties (dielectric function) of low-index surface of CuO, in order to determine the surface state of the most stable surface of CuO.</p>
Highlights
Photocatalytic reaction on the surface of semiconductor requires the appropriate photocatalytic potential or band edge of the semiconductor surface to drive redox reactions
We cannot perform the calculation through bulk system, because, within a periodic DFT calculation of bulk, the eigenvalues are not properly referenced to any absolute scale
Generalized gradient approximation (GGA) based on the Perdew–Burke–Ernzerhof (PBE) functional is used for the exchange-correlation energy
Summary
Photocatalytic reaction on the surface of semiconductor requires the appropriate photocatalytic potential or band edge of the semiconductor surface to drive redox reactions. DFT calculation provides a theoretical mean to calculate the band edge potential of material. When the DFT calculations performed onslabsystem which consists of an infinite surface and vacuum, the eigenvalues will be referring to the vacuum potential [1]. How to cite this article: Faozan Ahmad, M Kemal Agusta, and Hermawan K Dipojono, “First Principle Calculation of Electronic, Optical Properties and Photocatalytic Potential of CuO Surfaces,” KnE Engineering, vol 2016, 7 pages. Cupric oxide or tenorite (CuO) has been attractive attention because of its interesting properties as a p-type semiconductor with a narrow band gap (1.2-1.7 eV). In this paper we will calculate surface energy, work function, photocatalytic potential, electronic and optical properties theoretically from first principle
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