Satyajit Ratha
@iitbbs.ac.in
Researcher, School of Basic Sciences
Indian Institute of Technology Bhubaneswar
EDUCATION
MSc in Physics (Electronics)
RESEARCH INTERESTS
Electrical energy storage devices, Supercapacitor, Battery, Energy conversion, Fuel cell
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Satyajit Ratha, Surjit Sahoo, Pratap Mane, Balaram Polai, Bijoy Sathpathy, Brahmananda Chakraborty, and Saroj Kumar Nayak
Springer Science and Business Media LLC
AbstractThe advancements in electrochemical capacitors have noticed a remarkable enhancement in the performance for smart electronic device applications, which has led to the invention of novel and low-cost electroactive materials. Herein, we synthesized nanostructured Al2O3 and Al2O3-reduced graphene oxide (Al2O3-rGO) hybrid through hydrothermal and post-hydrothermal calcination processes. The synthesized materials were subject to standard characterisation processes to verify their morphological and structural details. The electrochemical performances of nanostructured Al2O3 and Al2O3- rGO hybrid were evaluated through computational and experimental analyses. Due to the superior electrical conductivity of reduced graphene oxide and the synergistic effect of both EDLC and pseudocapacitive behaviour, the Al2O3- rGO hybrid shows much improved electrochemical performance (~ 15-fold) as compared to bare Al2O3. Further, a symmetric supercapacitor device (SSD) was designed using the Al2O3- rGO hybrid electrodes, and detailed electrochemical performance was evaluated. The fabricated Al2O3- rGO hybrid-based SSD showed 98.56% capacity retention when subjected to ~ 10,000 charge–discharge cycles. Both the systems (Al2O3 and its rGO hybrid) have been analysed extensively with the help of Density Functional Theory simulation technique to provide detailed structural and electronic properties. With the introduction of reduced graphene oxide, the available electronic states near the Fermi level are greatly enhanced, imparting a significant increment in the conductivity of the hybrid system. The lower diffusion energy barrier for electrolyte ions and higher quantum capacitance for the hybrid structure compared to pristine Al2O3 justify improvement in charge storage performance for the hybrid structure, supporting our experimental findings.
Jeeban Kumar Nayak, Partha Roy Chaudhuri, Satyajit Ratha, and Mihir Ranjan Sahoo
Informa UK Limited
Rutuparna Samal, Pratap Mane, Satyajit Ratha, Brahmananda Chakraborty, and Chandra Sekhar Rout
American Chemical Society (ACS)
M. Dhanasekar, Satyajit Ratha, Chandra Sekhar Rout, and S. Venkataprasad Bhat
Elsevier BV
Surjit Sahoo, Satyajit Ratha, Chandra Sekhar Rout, and Saroj Kumar Nayak
Springer Science and Business Media LLC
Self-powered systems or self-powered devices belong to one of the most pivotal research topics that specifically aim toward the growth of portable and wearable electronic industries over the last few years. A sizeable number of self-powered systems have been established, utilizing the various modes of energy conversion (solar cells, mechanical energy harvester and thermal energy harvester) and storage technologies (batteries and supercapacitors). This review provides a summarized content regarding the research and development on the various types of self-charging supercapacitor power cells (SCSPCs) that have been developed since the past few decades. The selection of novel materials, device architecture and performance metrics are influential/critical for the evolution of SCSPCs for next-generation electronics applications. Integrating both the energy conversion and storage devices into a single system brings substantial challenges regarding the understanding of the underlying working mechanisms and its subsequent application for powering portable and wearable electronics. Up to date, state-of-the-art instances of SCSPCs fabrication technologies and performance matrices have been emphasized in this review. Furthermore, the key challenges encountered during SCSPCs fabrication, their useful applications in various fields and their possible solutions are discussed for future developments on SCSPCs.
Aneeya K. Samantara, Sudarsan Raj, and Satyajit Ratha
Apple Academic Press
Dnyanesh Vernekar, Mohammad Dayyan, Satyajit Ratha, Chandrashekhar V. Rode, M.Ali Haider, Tuhin Suvra Khan, and Dinesh Jagadeesan
American Chemical Society (ACS)
Aneeya K. Samantara, Jiban K. Das, Satyajit Ratha, Naresh K. Jena, Brahmananda Chakraborty, and J. N. Behera
American Chemical Society (ACS)
This work reports the hybridization of patronite (VS4) sheets with reduced graphene oxide and functionalized carbon nanotubes (RGO/FCNT/VS4) through a hydrothermal method. The synergistic effect divulged by the individual components, i.e., RGO, FCNT, and VS4, significantly improves the efficiency of the ternary (RGO/FCNT/VS4) hybrid toward the oxygen evolution reaction (OER). The ternary composite exhibits an impressive electrocatalytic OER performance in 1 M KOH and requires only 230 mV overpotential to reach the state-of-the-art current density (10 mA cm-2). Additionally, the hybrid shows an appreciable Tafel slope with a higher Faradaic efficiency (97.55 ± 2.3%) at an overpotential of 230 mV. Further, these experimental findings are corroborated by the state-of-the-art density functional theory by presenting adsorption configurations, the density of states, and the overpotential of these hybrid structures. Interestingly, the theoretical overpotential follows the qualitative trend RGO/FCNT/VS4 < FCNT/VS4 < RGO/VS4, supporting the experimental findings.
Basudeba Maharana, Satyajit Ratha, Afsal S. Shajahan, Brahmananda Chakraborty, Rajan Jha, and Shyamal Chatterjee
American Physical Society (APS)
Pritam Das, Subhasish Das, Satyajit Ratha, Brahmananda Chakraborty, and Shyamal Chatterjee
Elsevier BV
Sunil Kumar Pradhan, Mihir Ranjan Sahoo, Satyajit Ratha, Balaram Polai, Arijit Mitra, Bijoy Sathpathy, Arun Sahu, Subrat Kar, Parlapalli V. Satyam, Pulickel M. Ajayan,et al.
AIP Publishing
A simple yet innovative approach has been made through a powder metallurgy route for the synthesis of aluminum–graphene (Al–Gr) composite materials for commercially viable solar thermal collectors. The Al–Gr composite (with 1 wt. % of graphene filler content) recorded an enhanced thermal conductivity of ∼280 W/mK, which is higher than that of pristine Al (∼124 W/mK), at room temperature. It has also been found that the prepared composite has a lower coefficient of thermal expansion. The structures and morphologies of the composites have been investigated in detail with the help of X-ray diffraction technique, field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, Raman spectroscopy, etc. Furthermore, the density measurements showed that the composites retain ∼97.5% of the density of pristine aluminum even after the sintering treatment. X-ray micro-computed tomography revealed the structural integrity and non-porous nature of the samples, free from any defects and deformations. The thermal fusing of Al-based composite materials at 630 °C is found to be satisfactory with the required strength, and the composites showed at least ∼125% increase in the thermal conductivity than that of pristine Al. These results suggest that the Al–Gr composites can be deployed as solar thermal collectors and heat sink materials for thermal dissipation.
Priti Mishra, Arjun Behera, Debasmita Kandi, Satyajit Ratha, and Kulamani Parida
American Chemical Society (ACS)
Nickel ferrite (NiFe2O4) and magnetite (Fe3O4) are established earth-abundant materials and get tremendous attention because of magnetic and high photocatalytic activity. First we fabricated novel Fe3O4@20 wt % NiFe2O4/phosphorus-doped g-C3N4 (M@NFOPCN) using a convenient simple coprecipitation method followed by calcination at 400 °C. Then M@NFOPCN composites were prepared by the in situ growth of Fe3O4 nanorods and cubes on the surfaces of a porous agglomerated NFOPCN nanostructure, varying the weight percentage of Fe3O4. A series of characterizations like X-ray diffraction, UV-vis diffuse-reflectance spectroscopy, photoluminescence, Fourier transform infrared, thermogravimetric analysis-differential thermal analysis, vibrating-sample magnetometry, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy techniques confirm that changing weight percentage of M can constructively control the textural characteristics, internal strain, size of the crystals, and other aspects meant for photocatalytic activity. When M was coupled with NFOPCN, magnetic loss was lowered and also an appreciable saturation magnetization (Ms) was obtained. 40 wt % M@NFOPCN showed admirable photostability and was capable of evolving 924 μmol h-1 H2 when irradiated under visible light. The percentage of degradation for ciprofloxacin (CIP) by this ternary nanocomposite was almost 2-fold greater than those of the pure M and NFOPCN photocatalysts. A plausible photocatalytic mechanism for the degradation of CIP antibiotic was established. Hence, this study presents a reusable, low-cost, noble-metal-free, environmentally friendly, fast, and highly efficient 40 wt % M@NFOPCN photocatalyst, achieving 90% degradation of CIP antibiotic under visible light. The double-Z scheme triggers charge separation and migration, enhances visible-light harvesting, and helps in internal electric-field creation, thus headed toward dramatic augmentation of the photocatalytic activity.
Satyajit Ratha, Prashant Bankar, Abhijeet Sadashiv Gangan, Mahendra A. More, Dattatray J. Late, Jogendra N. Behera, Brahmananda Chakraborty, and Chandra Sekhar Rout
Elsevier BV
Abstract Field emission properties of pristine VSe2 and its hybrid with reduced graphene oxide (RGO) have been investigated in detail. Promising field emission performance were noted with lower values of turn-on and threshold fields of ∼1.3 V μm−1 and 2.12 V μm−1 respectively for the VSe2/RGO hybrid which is much more superior than that of pristine VSe2 emitter and other 2D materials. Density Functional Theory (DFT) simulations have also been performed to qualitatively support our experimental observations through demonstration of Density of States and computation of work function for pristine VSe2 and hybrid VSe2/RGO. The lowering of work function and appearance of additional states near Fermi level from carbon p orbital of RGO is responsible for superior field emission characteristics in hybrid VSe2/RGO compared to pristine VSe2 which supports our experimental observations. Our experimental data and theoretical insight from electronic structure simulations strongly infer that the synthesized hybrid VSe2/RGO has the potential to be tailored as efficient and high performance cathode material in field emission based devices.
Aneeya K. Samantara, Satyajit Ratha, and Sudarsan Raj
Elsevier
Abstract Graphene is an exceptional class of 2-D carbon material with excellent physicochemical properties such as high surface area (2630 m2 g−1), better electrical/thermal conductivity (∼5000 W m−1 K−1), high mobility of charge carrier (200,000 cm2 V−1 s−1), etc. Though a number of methods have been developed for synthesis of graphene, the wet chemical process is an efficient one for the scalable production of both graphene and functionalized graphene. Moreover, the ease of chemical modification of graphene’s surface make it suitable to employ in a broad range of applications, from energy to biomedical. Among other high-performance applications, the graphene-based materials have drawn substantial attention, both for the adsorption and removal of several environmental and health-threatening pollutants from the air. This chapter elaborately discusses the synthesis, functionalization, and composite preparation of graphene for the removal of toxic pollutants from air. It starts with an overview of different air pollutants and materials used for their filtration. Then a detailed discussion on the synthesis, physicochemical properties, and functionalization of graphene followed by its application towards the air filtration (for removal of CO2, SO2, aerogels, particulate matters, alkanes, etc.) will be presented. The chapter will conclude with a brief summary and perspective on the functionalized graphene material for air filtration.
Aneeya Kumar Samantara and Satyajit Ratha
Springer International Publishing
Aneeya Kumar Samantara and Satyajit Ratha
Springer International Publishing
The fossil fuel based energy resources are considered as the primary source of energy for day today requirement. But the limited reserve and carbon emission during the combustion process restricts their use demanding an alternative resource. After numerous research efforts, the researchers have successfully stored solar energy in form of chemical energy, especially in molecular hydrogen (H2). Like oil and natural gases, hydrogen is not energy but stores and carries energy. On the other hand, for ease of use, the online production of H2 remain indispensable. This chapter presents the development in the use of electrolysis for commercial hydrogen production, onsite electrolysis and use of H2 as a clean fuel in vehicles.
Aneeya Kumar Samantara and Satyajit Ratha
Springer International Publishing
Both the hydrogen evolution and oxygen evolution reaction follows a multi electron catalytic path and the mechanism strongly depends on the types of electrolyte used for the electrolysis. Also there are various key parameters available to evaluate the performances of a particular electrocatalyst. In this chapter, detailed discussion on the mechanism of both the HER and OER in acidic and alkaline electrolyte is presented. Moreover, emphasis has been given on the calculation of different key parameters like overpotential, Tafel slope, electrochemical active surface area, Faradic efficiency, Turnover frequency, long cycle life etc. used for efficiency evaluation of a catalyst.
Aneeya Kumar Samantara and Satyajit Ratha
Springer International Publishing
Electrolysis is the process of breakdown of stable water molecule on passage of current across the electrodes in aqueous electrolyte. Generally at a particular potential, the splitting of water to molecular hydrogen and oxygen takes place at cathode and anode terminals of the electrochemical cell. This chapter presents a brief discussion on the types of electrolysis and electrochemical cell. Further, for better understanding, complete configuration of electrodes in a three electrode electrochemical cell is presented.
Aneeya Kumar Samantara and Satyajit Ratha
Springer International Publishing
Aneeya Kumar Samantara and Satyajit Ratha
Springer International Publishing
Dnyanesh Vernekar, Satyajit Ratha, Chandrashekhar Rode, and Dinesh Jagadeesan
Royal Society of Chemistry (RSC)
Layered K-α-CrO(OH) nanosheets as a non-noble metal based tandem catalyst for sequential oxidation and coupling/condensation reactions.