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18,598 results on '"Rao, G."'

171. Towards real-time oxygen sensing: From nanomaterials to plasma

Author

Johny, Vinitha, Chinmaya, KV, CV, Muhammed Nihal, Kurian, Varghese, Rao, G Mohan, Ghosh, Moumita, and Ghosh, Siddharth

Subjects
Physics - Chemical Physics, Condensed Matter - Mesoscale and Nanoscale Physics, Physics - Instrumentation and Detectors, Physics - Medical Physics, Physics - Plasma Physics
Abstract

A significantly large scope is available for the scientific and engineering developments of high-throughput ultra-high sensitive oxygen sensors. We give a perspective of oxygen sensing for two physical states of matters - solid-state nanomaterials and plasma. From single-molecule experiments to material selection, we reviewed various aspects of sensing, such as capacitance, photophysics, electron mobility, response time, and a yearly progress. Towards miniaturisation, we have highlighted the benefit of lab-on-chip-based devices and showed exemplary measurements of fast real-time oxygen sensing. From the physical-chemistry perspective, plasma holds a strong potential in the application of oxygen sensing. We investigated the current state-of-the-art of electron density, temperature, and design issues of plasma systems. We also show a numerical aspects of low-cost approach towards developing plasma-based oxygen sensor from household candle flame. In this perspective, we give an opinion about a diverse range of scientific insight together, identifies the short comings, and opens the path for new physical-chemistry device developments of oxygen sensor along with providing a guideline for innovators in oxygen sensing.

Published
2021

198. Comparison of the electrochemical performance of CeO2 and rare earth-based mixed metallic oxide (Ce0.9Zr0.1O2) for supercapacitor applications

Author

Ghosh, Sourav, Rao, G. Ranga, and Thomas, Tiju

Subjects
Condensed Matter - Materials Science, Physics - Applied Physics
Abstract

CeO2 and Ce0.9Zr0.1O2 are prepared from the sol-gel method to investigate and compare their electrochemical properties for supercapacitor applications. Structural, morphological, and elemental studies have been done for CeO2 and Ce0.9Zr0.1O2 by XRD, SEM, and EDX. Cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy techniques are used to study the electrochemical performance of these materials. Doping enhances the electrochemical performance of the electrode, by improving the specific capacitance (~150%, 243 F g-1 from 96 F g-1) for the doped system @2 mV s-1 Vs. Ag/AgCl reference electrode in 2 mol L-1 KOH electrolyte solution. Ce0.9Zr0.1O2 shows only ~30% of capacitance degradation for a ten folds increase in current densities. Ce0.9Zr0.1O2 also shows 16% capacitance degradation after 800 cycles with excellent Columbic efficiency (~100%) @2 A g-1 current density. Partial replacement of Ce4+ ion (0.97 {\AA}) with Zr4+ ion (0.84 {\AA}) results in a decrease in lattice parameter, as confirmed by Rietveld refinement. Ce0.9Zr0.1O2 has provided good energy, and power density of 1.128 Wh kg-1and 112.5 W kg-1 respectively. Furthermore, better diffusivity of the Ce0.9Zr0.1O2 in KOH electrolyte (indicated using Randles-Sevcik equation-based analysis) is correlated with better electrochemical performance. These insights presented here clearly indicate that Zr doping into CeO2 results in a promising candidate material for electrochemical and supercapacitive applications., Comment: 17 pages, 7 figures, presented in International Conference on Advanced Materials, Energy and Environmental Sustainability (ICAMEES-2018)

Published
2021

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