Browsing by Author "Mascarenhas, F.J."

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Electrodeposited CoMnS/NiCo2S4 nanocomposite for high performance supercapacitors
(Elsevier Ltd, 2024) Mascarenhas, F.J.; Rodney, J.D.; Rao, L.; Kim, B.C.; Badekai Ramachandra, B.R.
In this work, we report a facile two-step electrodeposition method to fabricate a CoMnS/NiCo2S4/NF (CMS/NCS/NF) composite on nickel foam (NF) for application of supercapacitor electrode. The electrochemical performance of this composite material has been extensively investigated, revealing superior performance compared to individual CMS/NF and NCS/NF materials. The CMS/NCS/NF composite exhibits an exceptionally high specific capacity of 707 C/g at a current density of 1 A/g in a three-electrode system. Remarkably, the material retains 92 % of its specific capacitance after 5000 cycles, indicating excellent cyclic stability and durability. To further explore its practical applications, we constructed a two-electrode symmetric supercapacitor using the CMS/NCS/NF electrode. This symmetric cell demonstrates an outstanding energy density of 97.5 Wh/kg and a peak power density of 12 kW/kg, underscoring its potential for high-performance energy storage applications. These comprehensive studies indicate that the synthesized CMS/NCS/NF is a highly promising candidate for supercapacitor electrodes, offering both high capacity and long-term stability. This work paves the way for the development of efficient and durable energy storage devices. © 2024 Elsevier Ltd
Enhancing supercapacitor performance with zinc doped MnSe nanomaterial
(Springer, 2024) Mascarenhas, F.J.; Badekai Ramachandra, B.R.
The decreasing availability of fossil fuels and the increasing demand for energy highlight the pressing need for sustainable energy sources. Electrochemical technologies, notably supercapacitors, play a key role. They promise renewable energy storage, necessitating high-performing, safe, and affordable electrode materials. In this study, we present a novel hydrothermal synthesis method for producing MnSe and ZnxMn1-xSe materials across a range of concentrations (x = 0.01, 0.02, and 0.03). Characterization techniques including XRD, FESEM, HRTEM, BET and Raman analysis were employed. Among the synthesized compositions, Zn0.03Mn0.97Se emerged as the most promising material for supercapacitor applications. Evaluation through cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS) revealed specific capacitance values of 135 F/g at 3 mV/s and 95 F/g at 0.5 A/g for Zn0.03Mn0.97Se. Furthermore, the material demonstrated impressive stability, retaining 97% of its capacitance after 1000 cycles. Additionally, to validate the potential of the synthesized electrode, we assembled a two-electrode symmetric cell using Zn0.03Mn0.97Se as both positive and negative electrode material in a 5 M KOH electrolyte. Extensive characterization techniques, including CV, GCD, and long-term cyclic stability tests, revealed compelling evidence of the material’s robust electrochemical behavior. These findings underscore the potential of Zn0.03Mn0.97Se for supercapacitors, contributing to the advancement of sustainable energy storage. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.
Pd/C-decorated SnO2 for advanced non-enzymatic cholesterol biosensing: analytical application in clinical blood specimens
(Elsevier Inc., 2025) Rao, L.; Rodney, J.D.; S, S.; Mascarenhas, F.J.; Nayak, M.P.; Kim, B.C.; Badekai Ramachandra, B.R.
Cholesterol, a critical biomolecule, plays a vital role in physiological functions; however, elevated levels are associated with chronic conditions such as cardiovascular diseases, which remain a leading cause of mortality globally. To address this challenge, this study presents the synthesis of SnO2-Pd/C nanocomposite through a two-step process as a promising material for non-enzymatic cholesterol biosensing. Initially, SnO2 was synthesized via a hydrothermal method and subsequently decorated with Pd/C. The resulting SnO2-Pd/C nanocomposite was integrated with nickel foam (NF) as the active material for biosensor development. The biosensor demonstrated a remarkable sensitivity of 1560 µA mM?1 cm?2 for cholesterol detection, which is approximately three times higher than that of SnO2-NF (546 µA mM?1 cm?2). Key performance metrics included a Limit of Detection (LOD) of 28 µM and a Limit of Quantification (LOQ) of 34 µM in 0.1 M KOH solution, with a linear detection range extending from 200 µM to 2 mM. The SnO2-Pd/C-NF biosensor exhibited outstanding cyclic stability, retaining 97 % of its performance over 30 days, underscoring its potential for reliable and long-term applications. Furthermore, the sensor demonstrated robust and consistent sensing performance with human serum samples under standard conditions, highlighting its practical applicability in clinical diagnostics. © 2025 Elsevier B.V.
Revolutionizing energy storage: A novel Cu2Se-GO nanocomposite for supercapacitors
(Elsevier B.V., 2023) Mascarenhas, F.J.; Rodney, J.D.; Mishra, P.; Badekai Ramachandra, B.R.
There is a requirement for the evolution of clean energy sources since the energy demand has exponentially increased. Therefore, substantial research is being implemented to efficiently convert renewable energy and capture it in energy storage devices. In this regard, fabricating unique, advanced, and potent supercapacitor materials has been laborious and demanding. Herein, we report a facile one-pot hydrothermal method for synthesizing copper selenide (Cu2Se)-graphene oxide (GO) nanocomposite. Among the various compositions developed, Cu2Se-5GO showed the highest specific capacitance of 219 F/g at 5 mV/s when used as an electrode material in a 2 M KOH solution. Also, the composition showed a capacitance retention of 90.6 % after 10,000 charge–discharge cycles. Therefore, the collective effect of copper selenide and graphene oxide has proved the material to be upsurging, accessible, and utilizable for prospective electrochemical energy storage devices. © 2023 Elsevier B.V.
Significance of transition metal (Co, Ni and Zn) doping on the nano MnSe for high-performance supercapacitor electrode
(Elsevier Ltd, 2024) Mascarenhas, F.J.; Rodney, J.D.; Kim, B.C.; Badekai Ramachandra, B.R.
The demand for electrode materials in supercapacitors necessitates designs with exceptional performance, superior structure, and environmental sustainability, all while remaining affordable and abundantly available. This study introduces an economical hydrothermal synthesis method for producing MxMn1-xSe (M=Co / Ni / Zn) nanomaterials at varying concentrations (x = 0.0, 0.01, 0.02, and 0.03). Diverse characterization methods confirm the successful formation of nanomaterials. Among the materials studied, Co0.01Mn0.99Se nanoclusters exhibit superior performance as electrode materials for supercapacitors, delivering a specific capacitance of 421 F/g at 5 mV/s and 377 F/g at 1 A/g in a 5 M KOH solution. A two-electrode symmetric configuration was established utilizing Co0.01Mn0.99Se as the active material in a 5 M KOH electrolyte, yielding a notable specific capacitance of 73 F/g at 0.5 A/g. The maximum energy density and power density achieved are 20.44 Wh/kg and 2838 W/kg respectively. This configuration demonstrates the exceptional electrochemical performance and energy storage capabilities of Co0.01Mn0.99Se in a two-electrode system. Impressively, the symmetric cell maintains a significant 70% capacitance retention even after 5000 charge-discharge cycles. Considering these findings, the developed Co0.01Mn0.99Se emerges as a pivotal advancement, providing a robust framework for the development of cutting-edge energy conversion and storage technologies. © 2024 Elsevier B.V.
Supercapattery: An Electrochemical Energy Storage Device
(wiley, 2023) Mascarenhas, F.J.; Hegde, S.S.; Badekai Ramachandra, B.R.
The emission of greenhouse gases into the environment due to the use of non-renewable energy sources has become one of the biggest challenges to the world research community. Hence, there is a necessity for the evolution of clean energy sources since the energy demand has exponentially increased globally because of the expansion in the world’s population leading to modernization. Therefore, a substantial amount of research is being implemented to efficiently convert renewable energy and capture it in energy storage devices. One of the gravitating energy storage devices is a supercapattery device made from the battery and capacitor-type electrode materials with tremendous specific energy and power. The current chapter outlines the development and various aspects of supercapattery devices, including the device’s working mechanism, the materials used, the recent advancement, challenges, and future perspectives. © 2023 Scrivener Publishing LLC.