Dr. Debananda Mohapatra

UNIST, Graduate School of Semiconductor Materials and Devices Engineering (Department of Materials Science and Engineering), Faculty Member

Indian Institute of Technology Bombay, Metallurgical Engineering & Material Science, Research Associate

IIT Bombay, Metallurgical Engg and Materials Science, PhD Scholar - Graduate Research & Teaching Assistant

UNIST, School of Materials Science and Engineering, Faculty Member

Yeungnam University, Materials Science and Engineering, Faculty Member

Yeungnam University, Chemical Engineering, Faculty Member

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Hello!

I received my Ph.D. degree in Materials Science and Engineering from the Indian Institute of Technology Bombay (IIT Bombay), Mumbai, India, in 2017. Soon after my Ph.D., I joined as Research Scientist (2017-2018) at Tata Institute of Fundamental Research (TIFR), Mumbai, India, before coming to Yeungnam University in 2018, South Korea, as an Assistant Professor and later as Associate Professor (Research) at UNIST in May 2023.

My current research interests include advanced functional materials physics/engineering, energy/photo-electrocatalytic materials, photo-electrochemistry, electrode/electrolyte engineering, unique exohedral carbon nanostructures (CNO, heteroatoms doped CNO) coupled with binary/ternary (metal oxides, metal sulﬁdes), LDH, MOF, and MXenes (all 2D nanomaterials) for environmental sensing and clean energy conversion (DSSC, CO2, hydrogen fuel)-storage (supercapacitors, batteries) technology. I already contributed to several internationally renowned conferences (33 +) and published more than 37 high-impact factors in internationally peer-reviewed/refereed SCI (E)/SCOPUS journals, several book chapters, patents and the sole principal investigator (PI) for Govt. national projects to lead R&D independently.

I am always open to international scientific research, teaching, industry, and funding collaborations. Thank you very much!
Address: Building E-28, School of Materials Science and Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan, Gyeongbuk 38541, Republic of Korea.

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Papers by Dr. Debananda Mohapatra

Semi-Polycrystalline–Polyaniline Empowered Electrochemical Capacitor

Energies

We report on the formation of semi-polycrystalline polyaniline, a novel electroactive polymeric m... more We report on the formation of semi-polycrystalline polyaniline, a novel electroactive polymeric material synthesized by a modified surfactant-free chemical route and its enhanced electrochemical capacitive behavior. The material exhibits uniformly arranged spindle-shaped morphology in scanning electron microscopy and well-defined crystallographic lattices in the high-resolution transmission electron microscopy images. The X-ray diffraction spectrum reveals sharp peaks characteristic of a crystalline material. The characteristic chemical properties of polyaniline are recorded using Fourier transform infrared technology and laser Raman spectroscopies. The cyclic voltammetry curves exhibit features of surface-redox pseudocapacitance. The specific capacitance calculated for the material is 551 F g−1 at a scan rate of 10 mV s−1. The cycle stability and the coulombic efficiency recorded at a current density of 12 A g−1 exhibited good stability (90.3% and 99.5%, respectively) over 3000 cyc...

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Self‐Formation of a Ru/ZnO Multifunctional Bilayer for the Next‐Generation Interconnect Technology via Area‐Selective Atomic Layer Deposition

Small

Co-doped In-Situ Engineered Carbon Nano-Onions Enabled High-Performance Supercapacitors

Nanomaterials

The feasibility of achieving in situ sulfur (S) and nitrogen (N) co-doped carbon nano-onions (CNO... more The feasibility of achieving in situ sulfur (S) and nitrogen (N) co-doped carbon nano-onions (CNOs and SN–CNOs) via a simple flame-pyrolysis technique without using sophisticated high-vacuum annealing or expensive nanodiamond-based complex processes is demonstrated for the first time. The characteristic onion-like feature of 0.34 nm remained intact with a high degree of ordering and graphitization, even though the S and N heteroatoms were co-doped simultaneously. The in situ co-doped SN–CNO demonstrated high supercapacitor device performance with a high energy density of 25 Wh kg−1 at a maximum power density of 18 kW kg−1, maintaining 98% specific capacitance over 10,000 cycles at 10 A g−1. These are the highest achieved device performance values of a fullerene family electrode material to date.

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Atomic Layer Deposited RuO 2 Diffusion Barrier for Next Generation Ru‐Interconnects

Advanced Functional Materials

Conjugated polymer-based electrodes for flexible all-solid-state supercapacitors

Conjugated Polymers for Next-Generation Applications

Industrially scalable exfoliated graphene nanoplatelets by high-pressure airless spray technique for high-performance supercapacitors

FlatChem

Effect of Doping and Intercalation on the Performance of Supercapacitors

ECS Meeting Abstracts, 2020

The constant increase in energy demand and inconsistent supply have attracted significant attenti... more The constant increase in energy demand and inconsistent supply have attracted significant attention towards sustainable energy storage/conversion devices, such as electrochemical capacitors with high energy densities and power densities. Carbonaceous materials such as graphene, carbon nanotubes, and carbon fibers have been studied for energy storage. Materials based on metal oxides/sulfides have also been studied for electrochemical charge storage. Due to the limitations of these materials in the capacitance, a lot of studies have been done to improve the performance of supercapacitors, such as modification of the physical structure of the electrode materials for higher surface area. Other groups have been trying to modify the chemical nature by doping with different elements and by intercalating with different ions. Herein, the effect of doping of nitrogen and sulfur in carbon and metal oxides/sulfides structure on their charge storage performance are discussed. Intercalation of an...

Recent progress in trimetallic/ternary-metal oxides nanostructures: Misinterpretation/misconception of electrochemical data and devices

Applied Materials Today, 2022

Fabrication of novel bioceramic α-Fe2O3/MnO nanocomposites: Study of their structural, magnetic, biocompatibility and antibacterial properties

Materials Science and Engineering: B, 2021

Abstract In recent times, a sharp increase in prevalence of bacterial strains showing resistance ... more Abstract In recent times, a sharp increase in prevalence of bacterial strains showing resistance against currently used antibiotics has severely challenged the modern healthcare system in the treatment of bacterial infections. Therefore, it is needed to find suitable alternatives to counter this problem in order to treat contagious diseases. Nanomaterials/composites based inorganic antibiotic appears to be a feasible option, because these materials kill bacteria by concurrently acting through multiple mechanisms, unlike traditional antibiotics. In this study, Fe/Mn oxide nanocomposites were synthesized via a wet-chemical approach, and well characterized to examine their structural, dimensional, elemental, magnetic, cytotoxic and, antibacterial attributes. The nanocomposites exhibited mixed phases of constituent metal oxides α-Fe2O3 and MnO. The composite samples were of rod shape and shown room temperature superparamagnetism. Further, the prepared samples were found compatible with the cell lines MCF7 and MCF-12A, and exhibited ROS induced excellent bactericidal properties against bacteria E. coli, B. subtilis, S. aureus, and S. typhi. Therefore, the Fe/Mn oxide nanocomposites have the potential to become a promising alternative to the traditional antibiotics.

Different controlled nanostructures of Mn-doped ZnS for high-performance supercapacitor applications

Journal of Energy Storage, 2020

Various Mn-doped ZnS controlled nanostructures were synthesized directly on the nickel foam to de... more Various Mn-doped ZnS controlled nanostructures were synthesized directly on the nickel foam to develop a binder-free, high-performance positive electrode for supercapacitors, where specific energy, specific power, and cycling stability are the crucial parameters. We achieved Mn-doped ZnS based different nanostructures, such as nanosheets, nanoflakes, and nanoneedles just by monitoring the reaction temperature. Among those three morphologies, the nanosheets showed the highest specific capacitance of 1905 F g −1 at a current density of 1 A g −1 and 93.1% capacity retention after 10,000 cycles in a three-electrode system. An asymmetric supercapacitor (ASC) device was assembled using Mn-doped ZnS nanosheets and activated carbon as a positive and negative electrode, respectively. The ASC device showed a high capacitance of 140 F g −1 (210 C g −1), delivered a high specific energy of 43.3 Wh kg −1 , and a high specific power of 6.8 kW kg −1. The ASC device retained 93.3% with excellent coulombic efficiency of 95.7% after 8,000 cycles. Importantly, two serially connected ASC devices illuminated 52 red light-emitting diodes. This highlights the potential of the Mn-doped ZnS based ASC device for the next generation supercapacitors.

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Conventional or Microwave Sintering: A Comprehensive Investigation to Achieve Efficient Clean Energy Harvesting

Energies, 2020

Layers of titania are the critical components in sensitized photovoltaics. The transfer of electr... more Layers of titania are the critical components in sensitized photovoltaics. The transfer of electrons occurs from the dye molecule to the external circuit through a transparent conducting oxide, namely fluorine-doped tin oxide (FTO). Porosity, interparticle connectivity, and the titania films’ defects play a vital role in assessing the dye-sensitized solar cells’ (DSSCs) performance. The conventional methods typically take several hours to fabricate these layers. This is a significant impediment for the large-scale manufacture of DSSCs. This step can be reduced to a few hours by a microwave sintering process and may facilitate the rapid fabrication of the critical layers for sensitized photovoltaics, thus, boosting the prospects for the commercialization of these devices. In the present study, we aimed to perform different heat treatments (conventional and microwave) on the titania films with different temperatures to understand the phase formation, transmittance, and porosity withou...

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Uniform growth of ZnS nanoflakes for high-performance supercapacitor applications

Journal of Energy Storage, 2021

Abstract The cost-effective, efficient, and straightforward synthesis of materials for supercapac... more Abstract The cost-effective, efficient, and straightforward synthesis of materials for supercapacitor applications has attracted considerable attention for practical applications. In this study, thin zinc sulfide (ZnS) nanoflakes were grown on nickel foam by a facile single-step hydrothermal method. The resulting ZnS electrode delivered a high specific capacity of 659 C g–1 at 2 A g–1 and excellent cycling stability. It could function as a positive electrode in KOH electrolyte for high-performance supercapacitors. The device exhibited a remarkable specific capacity of 154 C g–1, high specific energy of 30 Wh kg–1, high specific power of 14 kW kg–1, and only a 4% decrease in the capacitance retention over 2000 cycles. Additionally, two serially connected asymmetric supercapacitor devices powered 52 red light-emitting diodes connected closely with 100 s.

Three-dimensional core-shell heterostructure of tungsten trioxide/bismuth molybdate/cobalt phosphate for enhanced photoelectrochemical water splitting

Journal of Colloid and Interface Science, 2021

Hydrogen has attracted increasing attention as clean energy for fuel cells over the past decade. ... more Hydrogen has attracted increasing attention as clean energy for fuel cells over the past decade. Photoelectrochemical (PEC) water splitting is considered the most feasible production method but its practical efficiency depends significantly on the photogeneration rate of electron (e-) and hole (h+) on a semiconductor photoanode and the rapid separation of these charge carriers. A proper match of small and large bandgap positions is also necessary. This paper presents a three-dimensional core-shell heterostructured tungsten trioxide/bismuth molybdate/cobalt phosphate (WO3/Bi2MoO6/Co-Pi) photocatalyst synthesized using simultaneous hydrothermal and electrodeposition techniques. Uniform Bi2MoO6 nanoflakes formed on WO3 nanoplates as evidenced by various micro-spectroscopic techniques. The as-prepared WO3/Bi2MoO6/Co-Pi hetero-photocatalyst exhibited significantly high photoelectrochemical activity, where its photocurrent efficiency was 4.6 times greater than that of the constituent WO3. Such drastic improvement in the PEC properties can be corroborated by the appropriate bandgap alignment among WO3, Bi2MoO6, and Co-Pi, resulting in a sufficient charge carrier density with efficient, fast charge-transport complementing their structural-morphological synergy. Furthermore, a heterojunction charge-transfer mechanism was proposed to verify the role of the co-catalyst, Co-Pi, in enhancing the photocurrent at the WO3/Bi2MoO6 photoanode under the same applied bias.

Natural solvent facilitated high-shear exfoliated graphene nanoplatelets enabled economically-efficient and stable DSSC

Materials Letters, 2021

Abstract This work presents an efficient and stable platinum-free shear-exfoliated graphene nanop... more Abstract This work presents an efficient and stable platinum-free shear-exfoliated graphene nanoplatelets (SE-GNP) based counter electrode (CE) for dye-sensitized solar cells (DSSCs). The SE-GNP is prepared by the simple, low cost and eco-friendly high-shear liquid-phase exfoliation technique in bulk using natural graphite flakes as a starting material in an aqueous medium. Detailed electrochemical studies demonstrate that SE-GNP-based CE offers a superior electrocatalytic activity for the redox reaction of I−/I3− redox couple with an improved charge transfer kinetics and the exchange current density at the electrode/electrolyte interface, compared to the standard Pt CE. The SE-GNP-based counter electrode shows exceptionally high stability (>3000 h) and efficiency (ƞ = 7.6%) under constant illumination at a negligible drop in DSSCs' performance.

Polyaniline integration and interrogation on carbon nano-onions empowered supercapacitors

Electrochimica Acta, 2021

Abstract The clean energy storage and fast delivery during the demand for sudden power applicatio... more Abstract The clean energy storage and fast delivery during the demand for sudden power applications encourage us to synthesize highly graphitic carbon nano-onions (CNOs) using a simple, one-step synthesis protocol. The as-synthesized CNOs demonstrate an excellent electrochemical property without employing any post-synthesis harsh chemical treatments and purifications. The integration of CNOs with the polyaniline (PANI) by the in-situ oxidative polymerization of the aniline monomer shows noticeable enhancement in the PANI's overall electrochemical performance. PANI/CNO heterostructure exhibits a maximum deliverable specific capacitance of 196 F g−1 at the current density of 1 A g−1. Notably, the energy and power densities also show enhancement for the heterostructure. In the hybrid heterostructure, CNO effectively improves the electronic conductivity, lessens the PANI fibers' agglomeration, and generates a larger active surface for the electrolytic ion interactions. Simultaneous contribution and synergistic effect from the CNO and the PANI lead to the co-existence of both electric double layer and pseudocapacitive specific capacitance in the nanocomposite. Favorable mesoporous structure with uneven surface contributed by incorporating CNOs results in enhanced wettability and shorter ion diffusion path in the PANI/CNO electrode. The successful integration of CNO into PANI augmented the capacitive performance of the device effectively.

Redox-additive electrolyte–driven enhancement of the electrochemical energy storage performance of asymmetric Co3O4//carbon nano-onions supercapacitors

Energy, 2021

ABSTRACT For efficient energy storage, Co3O4@nickel foam exhibiting a plate-like (p-Co3O4) and gr... more ABSTRACT For efficient energy storage, Co3O4@nickel foam exhibiting a plate-like (p-Co3O4) and grass-like (g-Co3O4) nanostructure were prepared as binder-free supercapacitor electrode materials. The electrochemical performance of the electrodes was tested using a redox-additive electrolyte (RAE). The homogeneously grown grass-like nanostructure (g-Co3O4) exhibited superior electrochemical performance to those with the plates-like structure (p-Co3O4) in a KOH electrolyte. In addition, the electrochemical performance of g-Co3O4 was improved using an RAE in a 3 M KOH solution. Remarkably, the specific capacitance of g-Co3O4 (1560 F g–1) was increased to 6580 F g–1, approximately 4-fold just by varying the RAE concentration in KOH. Carbon nano-onion (CNO) in the form of multi-layer fullerene was introduced as a negative electrode material. Owing to the more favorable morphology and properties of CNO such as exohedral structure, small diameter, high electrical conductivity, and relatively easy aqueous media dispersion than activated carbon and graphene, the as-fabricated asymmetric Co3O4//CNO supercapacitor delivered a high energy density of 42.5 Wh kg–1 and a high power density of 12.8 kW kg–1.

Carbon nano-onion-powered optically transparent and economical dye-sensitized solar cells

Nanoscale, 2020

Optically semi-transparent carbon nano-onion-powered dye-sensitized solar cells for building-inte... more

Growth of 2D nanoflakes from 1D long leaf arrays: Electrochemical influence of copper and nickel co-substituted cobalt oxide

Journal of Energy Storage, 2020

2D Cu-Ni-Co ternary oxide nanoflakes from 1D long leaf arrays were prepared using a simple, cost-... more 2D Cu-Ni-Co ternary oxide nanoflakes from 1D long leaf arrays were prepared using a simple, cost-effective, environmentally friendly hydrothermal approach, followed by heat treatment in air, and their supercapacitive performance was investigated. The binder-free 2D Cu-Ni-Co oxide nanoflakes electrode possessed an outstanding specific capacitance of 2615 F g − 1 (1046 C g − 1) at a current density of 1 A g − 1 as well as excellent rate capability and high capacitance retention of 88% at a high current density of 10 A g − 1 in a three-electrode configuration. A hybrid supercapacitor device exhibited a high specific capacity of 185 C g − 1 at 1 A g − 1 and high capacitance retention of 90.2% after 10,000 cycles. Additionally, the hybrid supercapacitor device delivered high specific energy of 51 Wh kg −1 at a specific power of 764 W kg −1. The attractive electrochemical performance of Cu-Ni-Co oxide makes this a promising electrode material for practical supercapacitor applications.

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Direct growth of nickel cobalt layered double hydroxide on nickel foam via redox reaction between nitrate ion and ethanol for hybrid supercapacitors

Electrochimica Acta, 2020

This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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In situ nitrogen-doped carbon nano-onions for ultrahigh-rate asymmetric supercapacitor

Electrochimica Acta, 2020

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Semi-Polycrystalline–Polyaniline Empowered Electrochemical Capacitor

Energies

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Self‐Formation of a Ru/ZnO Multifunctional Bilayer for the Next‐Generation Interconnect Technology via Area‐Selective Atomic Layer Deposition

Small

Co-doped In-Situ Engineered Carbon Nano-Onions Enabled High-Performance Supercapacitors

Nanomaterials

Download

Atomic Layer Deposited RuO 2 Diffusion Barrier for Next Generation Ru‐Interconnects

Advanced Functional Materials

Conjugated polymer-based electrodes for flexible all-solid-state supercapacitors

Conjugated Polymers for Next-Generation Applications

Industrially scalable exfoliated graphene nanoplatelets by high-pressure airless spray technique for high-performance supercapacitors

FlatChem

Effect of Doping and Intercalation on the Performance of Supercapacitors

ECS Meeting Abstracts, 2020

Recent progress in trimetallic/ternary-metal oxides nanostructures: Misinterpretation/misconception of electrochemical data and devices

Applied Materials Today, 2022

Fabrication of novel bioceramic α-Fe2O3/MnO nanocomposites: Study of their structural, magnetic, biocompatibility and antibacterial properties

Materials Science and Engineering: B, 2021

Different controlled nanostructures of Mn-doped ZnS for high-performance supercapacitor applications

Journal of Energy Storage, 2020

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Conventional or Microwave Sintering: A Comprehensive Investigation to Achieve Efficient Clean Energy Harvesting

Energies, 2020

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Uniform growth of ZnS nanoflakes for high-performance supercapacitor applications

Journal of Energy Storage, 2021

Three-dimensional core-shell heterostructure of tungsten trioxide/bismuth molybdate/cobalt phosphate for enhanced photoelectrochemical water splitting

Journal of Colloid and Interface Science, 2021

Natural solvent facilitated high-shear exfoliated graphene nanoplatelets enabled economically-efficient and stable DSSC

Materials Letters, 2021

Polyaniline integration and interrogation on carbon nano-onions empowered supercapacitors

Electrochimica Acta, 2021

Redox-additive electrolyte–driven enhancement of the electrochemical energy storage performance of asymmetric Co3O4//carbon nano-onions supercapacitors

Energy, 2021

Carbon nano-onion-powered optically transparent and economical dye-sensitized solar cells

Nanoscale, 2020

Optically semi-transparent carbon nano-onion-powered dye-sensitized solar cells for building-inte... more

Growth of 2D nanoflakes from 1D long leaf arrays: Electrochemical influence of copper and nickel co-substituted cobalt oxide

Journal of Energy Storage, 2020

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Direct growth of nickel cobalt layered double hydroxide on nickel foam via redox reaction between nitrate ion and ethanol for hybrid supercapacitors

Electrochimica Acta, 2020

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In situ nitrogen-doped carbon nano-onions for ultrahigh-rate asymmetric supercapacitor

Electrochimica Acta, 2020

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Carbon Nano-Onion: A Unique Negative Electrode for High Performance Supercapacitors

The 17th Symposium on Clean Technology (제17회 청정기술심포지엄), 2018

Conference Paper

Nitrogen-doped Carbon Nano-onions (N-CNO): Unique and Efficient Negative Electrode for Asymmetric Supercapacitors

Nano Korea 2018, 2018

Conference Paper

Carbon Nano Onion (CNO) and Heteroatoms-doped CNO for High Performance Supercapacitor Application

The 7th CAS-TWAS Symposium on Green Technology (GT2018), Bejing, China, 2018

Conference Paper

Novel Nanocomposites for High-Performance Supercapacitors

The Electrochemical Society, 2019

The use of renewable energy with unsteady supply has been gradually increased, requiring energy s... more The use of renewable energy with unsteady supply has been gradually increased, requiring energy storage for steady supply of energy. Carbonaceous materials such as graphene, carbon nanotubes, and carbon fibers have been studied for capacitive energy storage purposes. On the other hand, materials based on metal oxides/sulfides have been studied for electrochemical charge storage. Though the carbonaceous materials carry large surface area and high electrical conductivity, they have limited energy density. However, the metal oxides/sulfides perform electrochemical reactions, resulting in high energy density. Composites of carbonaceous materials and metal oxides/sulfides exhibit the synergistic effects on energy density and power density, improving the supercapacitor performances tremendously. We have tried several different carbon materials, metals, and particle sizes, synthetic methods, morphologies, etc., for better performances up to 4000 F g-1. Recently, we have developed carbon nano-onions and doped carbon nano-onions in inexpensive way for making remarkably capacitive materials.

Dr. Debananda Mohapatra

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