Browsing by Author "Pabba, Durga Prasad"

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    Design of highly stable Co3O4/RGO/CoFe2O4 hybrid nanocomposites with multiple nanointerfaces for enhanced supercapacitor performance
    (2024) Kavinkumar, T.; Reddy, N. Ramesh; Pabba, Durga Prasad; Ramadoss, Ananthakumar; Rednam, Udayabhaskar; Dhanabalan, Shanmuga Sundar; Chidhambaram, Natarajan; Asaithambi, Perumal; Hevia, Samuel A.; Thirumurugan, Arun
    In this study, we developed a novel hybrid electrode nanomaterial composed of Co3O4, CoFe2O4, and reduced graphene oxide (RGO) for electrochemical supercapacitor applications. The hybrid nanocomposite of Co3O4/ RGO/CoFe2O4 was prepared using a modified chemical oxidation process and the phase formation of the composites was evidenced by X-ray diffraction (XRD). The grain size for Co3O4 and CoFe2O4 was estimated as 12 nm and 22 nm. For Co3O4/CoFe2O4 the reduced grain size of 19 nm for CoFe2O4 was observed and further it was reduced with RGO up to 15 nm. The bare Co3O4 exhibited a hexagonal plate-like morphology, whereas the bare CoFe2O4 showed mostly a spherical morphology. The reduced saturation magnetization for the hybrid electrode material due to the non-magnetic fraction of Co3O4 and RGO was observed to be 21 emu/g compared to the bare CoFe2O4 (77 emu/g). The Co3O4/RGO/CoFe2O4 electrode exhibited enriched electroactive sites and enhanced diffusion pathways, achieving a high specific capacity of 235C g - 1 at 5 A g - 1 with excellent durability.. This work highlights the significant charge storage potential of the Co3O4/RGO/CoFe2O4 hybrid, making it a promising candidate for advanced energy storage systems.
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    Two-dimensional layered materials for triboelectric nanogenerators
    (2026) Natarajan, Gnanaseelan; Pabba, Durga Prasad; Acuña Ureta, David Esteban; Fischerauer Gerhard; Tremmel, Stephan; Marian, Max
    Triboelectric nanogenerators (TENGs) have emerged as promising technology for harvesting mechanical energy from diverse sources, including human motion, vibrations, and environmental forces. Layered or two-dimensional materials, such as MXenes, graphene, carbon nanotubes, transition metal dichalcogenides (TMDs), metal–organic frameworks (MOFs), and covalent organic frameworks (COFs), have gained significant attention for their ability to enhance TENG performance through tailored electronic properties, surface functionalization, and structural modifications. This review provides a comprehensive overview of the latest advancements in TENGs utilizing layered materials, discussing their material design, triboelectric behavior, and integration strategies. Theoretical models explaining charge transfer mechanisms, charge trapping effects, and energy conversion efficiency are critically analyzed. Additionally, challenges related to material degradation, wear, environmental stability, and scalability are addressed, along with potential solutions, such as self-healing tribolayers and advanced energy management circuits. By bridging material science and triboelectric nanogenerator technology, this review highlights future directions for the development of high-performance, durable, and sustainable energy harvesting systems.