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Abstract
Ca2Fe2O5 (CFO) is a potentially viable material for alternate energy applications. Incorporation of nitrogen in Ca2Fe2O5 (CFO-N) lattice modifies the optical and electronic properties to its advantage. Here, the electronic band structures of CFO and CFO-N were probed using Ultraviolet photoelectron spectroscopy (UPS) and UV-Visible spectroscopy. The optical bandgap of CFO reduces from 2.21 eV to 2.07 eV on post N incorporation along with a clear shift in the valence band of CFO indicating the occupation of N 2p levels over O 2p in the valence band. Similar effect is also observed in the bandgap of CFO, which is tailored upto 1.43 eV by N+ ion implantation. The theoretical bandgaps of CFO and CFO-N were also determined by using the Density functional theory (DFT) calculations. The photoactivity of these CFO and CFO-N was explored by organic effluent degradation under sunlight. The feasibility of utilizing CFO and CFO-N samples for energy storage applications were also investigated through specific capacitance measurements. The specific capacitance of CFO is found to increase to 224.67 Fg−1 upon N incorporation. CFO-N is thus found to exhibit superior optical, catalytic as well as supercapacitor properties over CFO expanding the scope of brownmillerites in energy and environmental applications.
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1 Anna University, Crystal Growth Centre, Chennai, India (GRID:grid.252262.3) (ISNI:0000 0001 0613 6919)
2 Raja Ramanna Centre for Advanced Technology, Synchrotron Utilization Section, Indore, India (GRID:grid.250590.b) (ISNI:0000 0004 0636 1456); Training School Complex, Homi Bhabha National Institute, Anushakti Nagar, India (GRID:grid.250590.b)
3 University of Madras, Department of Energy, Chennai, India (GRID:grid.413015.2) (ISNI:0000 0004 0505 215X)
4 Shibaura Institute of Technology, Graduate School of Science and Engineering, Koto-ku, Japan (GRID:grid.419152.a) (ISNI:0000 0001 0166 4675)
5 Inter University Accelerator Centre, Materials Science Division, New Delhi, India (GRID:grid.440694.b) (ISNI:0000 0004 1796 3049)
6 Indian Institute of Technology Madras, Nano Functional Materials Technology Centre, Department of Physics, Chennai, India (GRID:grid.417969.4) (ISNI:0000 0001 2315 1926)