Journal Articles

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Author: search.filters.author.Kumar, A.Subject: search.filters.subject.Coprecipitation method

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    Ag2Cu2O3 Nanorods as Electrocatalysts for Hydrogen Production and Overall Water Splitting
    (American Chemical Society, 2025) Kumar, A.; Hegde, A.P.; Puttur, M.; Gangadharappa, L.S.; Hosakoppa, N.S.
    In this research, a series of Ag2Cu2O3 nanorods as electrocatalysts were prepared with three different drying temperatures (namely, W - 50, W - 80, and W - 120), utilizing a regular coprecipitation approach. These nanorods’ surface morphology and structural attributes were thoroughly characterized using Field Emission Scanning Electron Microscopy and High-Resolution Transmission Electron Microscopy, while X-ray diffraction provided insight into their crystal structures. The compositional analysis was accomplished via X-ray photoelectron spectroscopy and Raman spectroscopy. The W - 50 catalyst exhibited the most promising electrochemical response among the synthesized samples. In the solution of 1 M KOH, at a current density of 10 mA cm-2, it demonstrated modest overpotential values and Tafel slopes of 81 and 97 mV dec-1 for the hydrogen evolution reaction (HER), whereas 409 and 140 mV dec-1 for the oxygen evolution reaction (OER). When tested with a two-electrode electrolyzer, W - 50 serving as together the anode and cathode, a trivial cell voltage of 1.9842 V was required to accomplish a current density of 100 mA cm-2, with surprising stability over 50 h of continuous operation at 200 mA cm-2 for overall water splitting. Additionally, W - 50 displayed excellent performance for HER; it necessitated an overpotential of 337 mV to accomplish an extreme current density of 800 mA cm-2. This inquiry provides precious perceptions into the importance of confined spaces within transition metal oxide-based catalysts, advancing their application in electrocatalysis. © 2025 American Chemical Society.
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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.