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Nkuna E, Mhlongo M, Dlamini C, Melato L, Bele A, Maphiri V. Impact of trivalent Yttrium on the structural and optical properties of CaAl 2O 4: New frontier in supercapacitor positive electrode. Heliyon 2024; 10:e33274. [PMID: 39027439 PMCID: PMC11254605 DOI: 10.1016/j.heliyon.2024.e33274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2024] [Revised: 06/17/2024] [Accepted: 06/18/2024] [Indexed: 07/20/2024] Open
Abstract
In this work, trivalent Yttrium doped calcium aluminate (CaAl2O4:x% Y3+) were synthesized for the first time. Through Photoluminescence (PL) spectroscopy and Commission Internationale de l'Eclairage (CIE), CaAl2O4:0.1 % Y3+ has demonstrated to be a potential high emitting phosphor material amongst other high concentration Y3+ doped samples, emitting a vibrant blue - pink hue where others are emitting a transiting hue from blue to green within a white vertex region. FTIR and UV-Vis have confirmed the prepared material and the presence of Y dopant. The SEM showed insignificant morphological change and the presence of pores, which were quantified using BJH and DFT methods to be micro - and meso-pores. Moreover, CaAl2O4 is also being reported as a positive electrode in supercapacitors for the first time. The analysis shows that it has superior performance within 1 M KOH electrolyte, with a specific capacity of 47.71 mA h g-1 at 1 A g-1 and a maximum power of 39.68 kW kg-1. Trasatti's method showed a surface (138 Fg-1) and diffusion (695 Fg-1) contribution ratio of 17:83 (%) of the total stored energy. It has a capacity retention and columbic efficiency of 100 % at the end of 10 000 cycles, which was achieved via utilization of all micropores reaction sites. The EIS showed a small solution resistance of 0.75 Ω, indicating high ionic conductivity and a phase angle of - 50 ° . Thus, these results show that CaAl2O4 is a potential candidate for photoluminescence and energy storage application.
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Affiliation(s)
- E. Nkuna
- Department of Physics, Sefako Makgatho Health Sciences University, P. O. Box 94, Medunsa, 0204, South Africa
| | - M.R. Mhlongo
- Department of Physics, Sefako Makgatho Health Sciences University, P. O. Box 94, Medunsa, 0204, South Africa
| | - C. Dlamini
- Department of Physics, Sefako Makgatho Health Sciences University, P. O. Box 94, Medunsa, 0204, South Africa
- Department of Applied Physical Sciences, Vaal University of Technology, Andries Potgieter Blvd, Vanderbijlpark, 1900, South Africa
| | - L.T. Melato
- Department of Applied Physical Sciences, Vaal University of Technology, Andries Potgieter Blvd, Vanderbijlpark, 1900, South Africa
| | - A. Bele
- Department of Physics, Sefako Makgatho Health Sciences University, P. O. Box 94, Medunsa, 0204, South Africa
| | - V.M. Maphiri
- Department of Physics, Sefako Makgatho Health Sciences University, P. O. Box 94, Medunsa, 0204, South Africa
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