Debasis GhoshIndian Institute of Technology Kharagpur | IIT KGP · Department of Materials Science
Debasis Ghosh
Bachelor of Arts
About
58
Publications
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1,734
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Introduction
Supercapacitor- the next generation energy resource
Publications
Publications (58)
Vanadium oxyhydroxide has been recently investigated as a starting material to synthesize different phases of vanadium oxides by electrochemical or thermal conversion and has been used as an aqueous zinc-ion battery (AZIB) cathode. However, the low-valent vanadium oxides have poor phase stability under ambient conditions. So far, there is no study...
Developing high-performance, safer, and affordable flexible batteries is of urgent need to power the fast-growing flexible electronics market. In this respect, zinc-ion chemistry employing aqueous-based electrolytes represents a promising combination considering the safety, cost efficiency, and both high energy and high-power output. Herein, we rep...
Electrochemical hydrogen generation via water splitting is the greenest approach toward the hydrogen economy. To satisfy the practical utilization, the electrocatalyst for hydrogen evolution reaction (HER) must be of low cost with high catalytic activity. Accordingly, transition metal based electrocatalysts have attracted significant research inter...
Lithium/Sodium-ion batteries (LIB/SIB) have attracted enormous attention as a promising electrochemical energy storage system due to their high energy density and long cycle life. One of the major hurdles is the initial irreversible capacity loss during the first few cycles owing to forming the solid electrolyte interphase layer (SEI). This process...
Herein we demonstrate a high-performance full cell aqueous zinc ion battery with structurally engineered V3O7·H2O cathode and surface modified metallic zinc anode. We demonstrate that the capacity, rate performance and stability of V3O7·H2O cathode can be significantly improved via Zn²⁺ pre-intercalation, which acts as a pillaring agent to stabiliz...
The state-of-the-art rechargeable batteries mostly utilize organic electrolytes; nevertheless, the flammable organic electrolyte imposes serious safety concerns. Recently deep eutectic solvent (DES) has emerged as a promising alternative electrolyte, which possesses ionic liquid (IL) like physical properties, such as, extremely low vapor pressure,...
A zinc-ion battery (ZIB) employing an aqueous electrolyte, that is, an aqueous zinc-ion battery (AZIB), represents a unique combination of high energy and high power with much-desired safety. In this respect, vanadium oxide-based cathodes, with open frameworks and rich valence states, have shown promising characteristics toward hosting the Zn²⁺ions...
The past decade has witnessed significant research interest in rechargeable Na-ion batteries (SIBs). Compared to Li-ion batteries (LIBs), SIBs promise to be much more cost-effective, thanks to the high abundance of sodium, and they are capable of providing energy densities close to LIBs when the cost is normalized. However, although promising, conv...
Orthorhombic crystal structure of the V 3 O 7 ·H 2 O material has large interlayer spacing with an open tunnel, making it promising as an intercalation-based cathode for aqueous zinc-ion batteries. However, structural degradation and dissolution cause quick capacity fading for V 3 O 7 ·H 2 O. We addressed this issue via a dual modification of the V...
In the present work, a simple and cost-effective precipitation approach was carried out to fabricate CuO nano-needle, and its electrochemical performance was evaluated in a redox-mediated electrolyte (2 M KOH and 0.3 M K3Fe(CN)6). A high specific capacitance of 2519 F/g was recorded at a specific current of 8 A/g. However, the electrode suffered fr...
Meeting the increasing global energy demand has pushed the energy storage research towards developing energy dense and safer electrochemical energy storage devices following sustainable and economic approach. In this regard,...
In this article, we report simple and scalable one-pot molten salt synthesis of CoFe2O4 as electrode material for Lithium ion batteries. X-ray diffraction studies along with Rietveld analysis showed a pure phase of CoFe2O4 with space group Fd-3m and crystallite size of 54 nm. As an anode material CoFe2O4 showed high initial discharge/charge capacit...
Lithium-sulfur (Li-S) batteries are promising next-generation rechargeable energy storage systems due to their high energy density and use of abundant and inexpensive materials. However, rapid self-discharge and poor cycle stability due to the solubility of intermediate polysulfide conversion products have slowed their commercialization. Herein, we...
This article reports the first instance of exploring a chemically Zn(II) pre-inserted organic–inorganic hybrid material [vanadyl ethylene glycolate or VEG, (VO(CH2O)2)] as an efficient cathode for rechargeable zinc ion batteries (ZIBs). The control VEG electrode synthesized by a glycothermal process showed a modest specific capacity of 157 mAh/g at...
This work focuses on designing new electrode materials by fabricating a nanocomposite hybrid of MWCNTs and a binary metal oxide, ZnMn2O4. The ZnMn2O4 has been extensively investigated as a high-performance anode in Li-ion battery, however, its capacitive faradaic charge storage behavior is rarely explored. Herein we demonstrate the fabrication of Z...
Polyaniline (PANI) as supercapacitor electrode component has received increasing attention due to its high theoretical capacitance, ease of preparation and offers flexibility to fabricate device at low cost. However, PANI suffers from large volume change during doping-dedoping process, and the structural instability becomes more severe at high curr...
In this article, we investigated the role of potassium and Lithium hydroxide (KOH & LiOH) as precipitating agents on the physiochemical properties and electrochemical performance of MgCo2O4. Uniform cubic particles were obtained using lithium hydroxide. When LiOH was used as precipitating agents, discrete nanoparticles with uniform particle size we...
Metallized DNA is an exciting functional material having widespread utility towards multifunctional applications. However, conventional DNA metallization processes are time consuming, multi-steps, and most importantly helicity of DNA is destroyed during metallization process. Herein, an ecofriendly and rapid approach has been demonstrated to metall...
In the present study, we explore a facile route for the ultrafast preparation of nanostructured MnxOy at room temperature in a short reaction time using KMnO4 as precursor and deep eutectic solvents (DESs; such as CC-EG, CC-Glucose, and CC-EG-Glucose) as ecofriendly solvent cum reducing agent. A detailed study was undertaken to examine the reaction...
The surface water is widely adulterated by hazardous pollutants such as dyes, pharmaceutical wastes, surfactants, heavy metals, hormones, etc. Hence, there is a necessity to develop a water treatment technology which can overcome all the major water related problems. The conventional methods for water disinfection are very specific and expensive. T...
In this article, we have reported a one-step scalable synthesis of MgCo 2 O 4 nanostructures as efficient anode material for Li-ion batteries and investigated the role of post-synthesis calcination temperature (400, 600 and 800 °C)on its physiochemical properties and electrochemical performances. The XRD pattern of the calcinated sample at 400 °C (...
The flexible and light weight supercapacitors as a power source for flexible electronics have attracted extensive attention recently. Herein, we present the fabrication of a flexible aerogel composed of reduced graphene oxide (rGO) and delaminated titanium carbide (Ti 3 C 2) sheets as a high performance, binder free, flexible and self-standing elec...
Solvothermal carbon (STC) has emerged as exciting functional materials for diverse applications. However, designing STC with tunable properties (for instance shape, chemical functionalities, surface acidity, and etc.) for on-demand application...
We report a simple and scalable synthesis of MnCo 2 O 4 /MWCNT nanocomposite by a simple precipitation method and its application as a high capacity anode material for Li-ion batteries. X-ray diffraction analysis showed a pure phase of MnCo 2 O 4 and morphological analysis revealed a uniform decoration of MnCo 2 O 4 nanoparticles along MWCNT backbo...
The lithium–sulfur battery is a promising next‐generation rechargeable battery system which promises to be less expensive and potentially fivefold more energy dense than current Li‐ion technologies. This can only be achieved by improving the sulfur utilization in thick, high areal loading cathodes while minimizing capacity fading to realize high pr...
There is a sizable interest in the fabrication of carbon helices
owing to their utilities in several applications. Methods have been
developed for the preparation of such carbon helices from
nonrenewable hydrocarbons by a metal-catalyzed chemical vapor
deposition process. However, such methods require high
temperature, toxic gases besides multi-ste...
Supercapacitors, also known as electric double-layer capacitors (EDLCs), are able to store energy rapidly and reversibly through the formation of a double-layer of electronic and ionic charge, closely spaced, at the electrode/electrolyte interface. [1-2] Due to the combination of various advantageous properties, such as efficient operation at high...
Modern flexible consumer electronics require efficient energy storage devices with flexible free standing electrodes. We report a simple and cost effective route to graphene based composite aerogel encapsulating metal oxide nanoparticles for high energy density, free standing binder-free flexible pseudocapacitive electrodes. Hydrothermally synthesi...
Rapid progress in the portable and flexible electronic devises has stimulated supercapacitor research towards the design and fabrication of high performance flexible devices. Recent research efforts for flexible supercapacitor electrode materials are highly focusing on graphene and chemically modified graphene owing to the unique properties, includ...
Our present work deals with the hydrothermal synthesis of Platelet β Co(OH)2 using cobalt(II) acetate as the metal precursor and ammonia solution as the hydrolyzing agent. Electrochemical capacitive performance was studied through cyclic voltammetry (CV), galvanostatic charge discharge (CCD), and electrochemical impedance spectroscopy (EIS) analyse...
Herein, we report a cost-effective and easy synthetic procedure for the fabrication of a graphene-single-walled carbon nanotube-poly(3-methylthiophene) ternary nanocomposite for high-performance supercapacitor electrodes. The possible interactions of both graphene (Gr) and single-walled carbon nanotubes (SWCNTs) with poly(3-methylthiophene) (PMT) w...
In this study, a simple and cost effective one pot hydrothermal process has been carried out for the synthesis of 1D CoMoO4.0.75H2O nanorod and a binary composite of CoMoO4.0.75H2O/PANI has also been synthesized by in situ oxidative polymerization of anilne with the virgin CoMoO4.0.75H2O. Two types of PANI morphology has been demonstrated, amorphou...
A simple and cost effective hydrothermal method has been done for the synthesis of MoS
2
and MoS
2
/rGO nanocomposites. The
prepared MoS2/rGO composite was characterized by XRD, FESEM and TEM which revealed the formation and as well as the
morphological scenario of MoS2
/rGO nanocomposite. Pure MoS
2
and MoS
2
/rGO nanocomposite show 3D hierarc...
A simple and cost effective one pot hydrothermal process has been followed for the synthesis of flowery Ni(OH)2, reduced graphene oxide (rGO)/Ni(OH)2 hybrid composite. A ternary composite of rGO/Ni(OH)2/PANI has also been synthesised by in situ oxidative polymerisation of aniline with the binary composite of rGO/Ni(OH)2. A unique morphology of vert...
A unique and cost effective hydrothermal procedure has been carried out for the synthesis of hexahedron shaped α MnMoO4 and its hybrid composite with graphene using three different weight percentages of graphene. Characterization techniques, such as XRD, Raman and FTIR analysis, established the phase and formation of the composite. The electrochemi...
In-situ hydrothermal method is employed to synthesize graphene/zirconium oxide composite from respective precursors graphene oxide and zirconium oxy-nitrate. In this method, the graphene oxide is reduced itself to graphene and simultaneously metal oxide gets anchor on the graphene sheets. A novel method is also developed for the preparation of vert...
One-dimensional NiMoO4·nH2O nanorods and their graphene based hybrid composite with good electrochemical properties have been synthesized by a cost effective hydrothermal procedure. The formation of the mixed metal oxide and the composite was confirmed by XRD, XPS and Raman analyses. The morphological characterizations were carried out using FESEM...
NiMnO3-nitrogen doped graphene composite has been synthesized by a simple hydrothermal method and its supercapacitor performance investigated. The composite exhibits a specific capacitance of 750.2 F g(-1) in 1 M Na2SO4 at a scan rate of 1 mV s(-1). Nitrogen insertion inside the carbon lattice plays a crucial role in the enhancement of the overall...
In the present paper, we have reported the in-situ chemical synthesis and
characterizations of polyaniline with both HCl and Zirconium (IV). The polyaniline was synthesized
by electrochemical oxidative polymerization of aniline monomer using ammonium peroxodi-sulphate as oxidizing agent. The doped PANI was charecterized by Ultraviolet-Visible (UV-V...
In the search of promising electrode materials for supercomputer application, we have synthesized Ni2+ doped Polyaniline, and nanocomposite based on multiwalled carbon nanotubes (MWCNTs) and Ni2+ doped Polyaniline (PANI) in the HCl medium by in situ oxidative polymerization. In HCl medium and in presence of Ni2+, PANI becomes co-doped with both H+...
In this work hydrothermally synthesized hierarchical stacked nanoplate of Ni(OH)2 and Ag
deposited Ni(OH)2 have been successfully fabricated on graphene nanosheet. The prepared Ni(OH)2, Ag deposited Ni(OH)2 and their graphene based composites were characterized by XRD, FESEM and TEM analysis. Graphene increases the utility of the pseudocapacitive...
Polypyrrole (PPy) composites were prepared with both unmodified and amine‐modified multiwalled carbon nanotubes (MWCNTs) in the presence and absence of barium titanate (BaTiO3) by in situ oxidative polymerization. A uniform coating of PPy on the MWCNTs and BaTiO3 surfaces was confirmed by field emission scanning electron microscopy and high‐resolut...
We have prepared H+ doped Polyaniline (PANI)/multiwalled carbon nanotubes (MWCNTs), Fe3+ doped PANI/MWCNTs, and H+, Fe3+ codoped PANI/ MWCNTs nanocomposites via in-situ oxidative polymerization method. The formation of the doped PANI in the composite was confirmed by the FTIR, and Raman spectroscopy. The electrochemical characterizations were carri...
In this paper our propose work deals with the preparation of cetyl trimethylammonium bromide (CTAB) assisted hexagonal platelet β Co(OH)2 via a simple hydrothermal process and its graphene based hybrid composite with improved electrochemical properties. The prepared materials were successfully characterized by FTIR, XRD, FESEM, TEM and TGA analysis...
Supercapacitors evolved as the premier choice of the era for storing huge amount of
charge in the field of energy storage devices, but we still need to enhance their
performance to meet the increasing requirements of the future systems. This could be
achieved either through advancing the interfaces of the material at the nano scale or
by using nove...
HCl doped polyaniline (PANI) and Ru (III) doped polyaniline (Ru/PANI) have been successfully prepared by in situ oxidative polymerization method and the effect of transition metal incorporation in PANI backbone is investigated thoroughly by the execution of Fourier transform infrared spectroscopy (FT-IR) and Raman study. Moreover, to examine the ch...
A new supercapacitor electrode material was prepared by the in-situ oxidative polymerization of aniline in presence of graphene and transition metal. The structural property of the composites has been determined by Raman spectroscopy. The formation of the composites has been confirmed by field emission scanning electron microscopy and the high reso...
Composites based on both unmodified and amine-modified
graphene were successfully prepared via in situ oxidative polymeri-zation of pyrrole in presence of SrTiO3. To characterize the
graphene/amine-modified graphene-polypyrrole-SrTiO3 composite
electrodes, cyclic voltammetry test for measuring specific capaci-tance, cyclic charge discharge test and...
Nanocomposites based on Cu-doped nickel zinc ferrite and lead zirconium titanate exhibited significant microwave absorbing properties in the X-band (8.2–12.4 GHz) region. Coprecipitation and homogeneous precipitation methods were utilized to synthesize Cu-doped nickel zinc ferrite (Cu0.2Ni0.4Zn0.4Fe2O4) and lead zirconium titanate (Pb(Zr0.52Ti0.48)...
Supercapacitors are highly attractive energy storage device of the modern world. It can supply peak pulse power and high cycle
stability to an electrochemical system. Here, we have explored the formation of copper ferrite (CuFe2O4
) nanowire formation in
presence of carbon nanotubes (CNTs) and enhancement of electrochemical performance on fluorinat...
The objective of this work is to modify graphene and study the effect of modification of graphene in thermal and electrical properties of graphene/polypyrrole and graphene/polyaniline nanocomposites. The amine functionalization of graphene was confirmed by Fourier transform infrared spectroscopy and X‐ray photoelectron spectroscopy. The nanocomposi...
Nowadays with ever increasing demand of energy, developing of alternative power sources is an important issue all over the world. In this respect we have prepared nanocomposites based on metal oxide (titanium oxide) coated multiwalled carbon nanotubes (MWCNTs)/polyaniline (PANI) with graphene and without graphene and studied their electrochemical p...
Nowadays with ever increasing demand of energy, developing of alternative power sources is an important issue all over the world. In this respect we have prepared nanocomposites based on metal oxide (titanium oxide) coated multi-walled carbon nanotubes (MWCNTs)/polyaniline (PANI) with graphene and without graphene and studied their elec-trochemical...
Questions
Questions (18)
I want to electrodeposite metal oxide, say MnO2 on a carbon current collector.What are the different techniques? How to decide the potential window for the electrodeposition? I have consulted different literature where different potential window have been used.
How the pseudocapacitance will arise Which functional group should contribute much to it?
Normally other current collectors like glassy carbon is used as current collector for Al ion battery. What about if the Al anode is itself used as current collector.
KIndly suggest me most common solvent used in breath figure patterening.
Since most of the articles prefer to synthesize N doped graphene using graphene oxide as precursor, my interest is to know whether there is any method to synthesis N doped graphene (high % of N) using graphene directly. If possible kindly cite references.
Since everyone is interested towards graphene based supercapacitor over CNT, I am interested to know if there is any interesting property of CNT over graphene for its use in supercapacitor.
The energy density and power density should be calculate using the mass of active electrode material only or considering all the mass of current collector,electrolyte and packaging elements. Is there any way of calculation energy density and power density by three electrode system testing?
Suppose an electrode material with mass m gram in 1 cm2 area of current collector is characterized by three electrode test, and the specific capacitance obtained is Y F/g. Now if a symmetric supercapacitor is fabricated using two electrode with same mass in same area and the specific capacitance obtained is Z F/g then is there any relation between Y and Z?
Is it possible to fabricate a symmetric devise by this electrode? If possible what will be the cell voltage of the symmetric supercapacitor?
Please help me find the answer.
Suppose a supercapacitor electrode is being tested within the potential range of 0-0.4 V in both three electrode cell, two electrode cell and in a symmetric supercapacitor assembly.We know that a three electrode system always overestimates the value. Is there any relation between the two measurement, provided the mass of a single electrode and the working potential is same.
Again suppose two material A and B. A can be operated within the potential range of -0.5V to +0.2V, whereas, B can be operated within the potential range of 0V- 1 V. If we fabricate an asymmetric supercapacitor,would their asymmetric assembly be able to give a cell voltage of 1.5V? and if A is symmetrically assembled, what should be the working potential and cell voltage?
Is it similar to that of the scan in positive potential? If a system A2+/A3+ has a redox potential of 0.2 V, then should the redox peak come at -0.2 V during the negetive potential scan. Please clarify.
For electrochemical characterization in two electrode system.
