Faculty Publications
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Item Effect of methyl orange dye molecule on the structural, optical and electrical properties of the KHOOD single crystals(Springer, 2020) Mahendra, K.; Pujar, S.; Udayashankar, N.K.In the present investigation, synthesis of pristine and methyl orange dye-doped potassium hydrogen oxalate oxalic acid dihydrate (KHOOD) single crystals are reported. In this study, the structural properties of the crystals were investigated using powder XRD and the effect of dye incorporation on the KHOOD crystal was explored in detail. The effect of dye molecule on the optical absorption of the crystal was studied and the optical band gap was calculated using Tauc relation and presented in detail. Further, the effect on emission and mechanical properties of the crystals were also explored after doping with the dye molecule. Furthermore, the crystals were also studied electrically by subjecting to varying electrical frequencies (A.C) and the properties of pristine and doped crystals were compared and explained in detail. The modulus properties of the crystals were studied and compared. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.Item Cobalt-doped LaFeO3 for photo-Fenton degradation of organic pollutants and visible-light-assisted water splitting(Springer, 2024) James, A.; Rodney, J.D.; Manojbabu, A.; Joshi, S.; Rao, L.; Badekai Ramachandra, B.R.; Udayashankar, N.K.The increasing demand for clean energy sources and the growing concerns about environmental pollution have led to a significant interest in developing efficient photocatalytic and photoelectrochemical systems. Here, we report the visible-light-induced photo-Fenton catalytic degradation of Methylene Blue (MB) dye over LaFeO3 and LaCo xFe1−xO3 (x = 0.01, 0.05, 0.1) catalysts synthesized via the facile combustion method. The LaCo0.01Fe0.99O3 has significantly enhanced the photo-Fenton catalytic efficiency of LaFeO3 from 67.75 to 93.85% for MB dye removal after 180 min of light irradiation. The rate constants calculated via the pseudo-first-order kinetics mechanism are found to be 0.00532/min for LaFeO3 and 0.01476/min for LaCo0.01Fe0.99O3, respectively. In addition, the most effective LaCo0.01Fe0.99O3 catalyst has demonstrated remarkable degradation performance towards Tetracycline (TC) and Methyl Orange (MO) dye with an efficacy of 93.81% and 69.67%, respectively, indicating its versatility. Further, the pristine and doped LaFeO3 were structurally optimized using DFT, and the computed band gaps were following the experimental data. Interestingly, the same catalyst can be employed as a light-induced electrocatalyst in addition to water treatment by taking advantage of its dual functionality. The LaCo0.01Fe0.99O3 catalyst achieved a benchmark current density of 10 mA/cm2 for H2 evolution at an overpotential of 297 mV vs. RHE which further improved to 190 mV vs. RHE under illumination. This work provides valuable insights on partial Co incorporation at the B-site of LaFeO3 for the development of visible-light-induced photocatalytic and electrocatalytic systems, which is hoped to contribute to the advancement of sustainable energy production and environmental remediation. © 2024, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.