Browsing by Author "P, M."

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    Melamine – Ni-MIL-88A blend derived Trevorite/C-g-C3N4 for stable and efficient overall electrocatalytic water splitting applications
    (Elsevier Ltd, 2025) Hegde, A.P.; P, M.; G, L.; Kumar, A.; Nagaraja, H.S.
    The electrocatalytic splitting of water into hydrogen and oxygen plays a pivotal role in addressing the energy demands associated with expanding anthropogenic activities. The design of economically feasible and effective electrocatalytic materials for water electrolysis is imperative for the sustainable production of hydrogen and oxygen. In this context, this study introduces an electrocatalyst design comprising graphitic carbon nitride (g-C3N4) and Trevorite (Ni(Ni, Fe)2O4) synthesized through the pyrolysis of a mixture Ni-substituted metal–organic framework (MOF) MIL-88A and of melamine. The synthesized material was evaluated as an electrocatalyst for both the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER). The nickel foam coated with this electrocatalyst exhibits a performance characterized by lower overpotentials of 121 mV for HER and 231 mV for OER at a current density of 10 mA cm-2 in an alkaline medium of 1 M KOH. Furthermore, the composite demonstrated an excellent overall water splitting capacity, maintaining a high current density of 500 mA cm-2 for more than 50 h of continuous electrolysis in 1 M KOH solution with a minimal voltage increase of approximately 0.025 V. © 2025
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    Novel Ag2Cu2O3 nanorods as stable anode material for lithium-ion battery
    (Elsevier B.V., 2025) Kumar, A.; Sagar G, L.; P, M.; Hegde, A.P.; Nagaraja, H.S.
    In this research novel Ag2Cu2O3 nanorods was prepared, for lithium-ion battery as anode, using facile co-precipitation method with four different stirring time and correspondingly Ag2Cu2O3 named ACO – 30 M, ACO – 12 H, ACO – 24 H, and ACO – 36 H. Field Emission Scanning Electron Microscopy (FESEM) and High-Resolution Transmission Electron Microscopy (HRTEM) analyze surface and morphology, while X-ray Diffraction (XRD) examines structural properties. Compositional analysis is carried out using X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The electrochemical analysis is evaluated by cyclic stability, rate capability, discharge/charge capacity, electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV). The ACO – 24 H nanomaterial demonstrates an initial discharge capacity of 943 mAh g?1 at a current density of 50 mA g?1. Among the four materials tested, ACO – 24 H shows superior cycling performance, with a discharge capacity of 174 mAh g?1 at 200 mA g?1 after 1003 cycles. In comparison, ACO – 30 M, ACO – 12 H, and ACO – 36 H exhibit capacities of 134 mAh g?1, 91 mAh g?1, and 43 mAh g?1, respectively, under the same conditions. This study suggests that ACO – 24 H is a promising anode material for lithium-ion battery applications. © 2025 Elsevier B.V.