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  1. Article ; Online: Recent advance on fundamental properties and synthesis of barium zirconate for proton conducting ceramic fuel cell

    Nayak, Arpan Kumar / Sasmal, Ananta

    Journal of Cleaner Production. 2023 Feb., v. 386 p.135827-

    2023  

    Abstract: Recently, Perovskite oxides have become the primal components for the establishment of electrochemical conversion device like Proton conducting Ceramic Fuel Cells (PCFC). Owing to the excellent chemical stability and rapid proton diffusion, barium ... ...

    Abstract Recently, Perovskite oxides have become the primal components for the establishment of electrochemical conversion device like Proton conducting Ceramic Fuel Cells (PCFC). Owing to the excellent chemical stability and rapid proton diffusion, barium zirconate (BaZrO₃) is acknowledged as the emerging PCFC electrolyte material. Nanoionics envisions the distinct features, behaviour, and efficiency of the material and endorses its chemical reactivity and electrical property against harsh environment with enlarged surface area and quantum effect. To enhance the material property, barium zirconate (BaZrO₃) has been prepared by different novel synthesis techniques altering the synthesis parameters and conditions. Dopant incorporation into pristine BaZrO₃ accelerate the mobility of protons and increases the proton conductivity at reduced temperature (600–700 °C). This featured article demonstrates the elemental properties, synthesis methods and the role of trivalent dopant impurities which helps to expand the scope of PCFC application with optimized output performance.
    Keywords barium ; ceramics ; chemical reactions ; electrical properties ; electrochemistry ; electrolytes ; fuel cells ; fuels ; surface area ; temperature ; Barium zirconate ; Synthesis methods ; Perovskite structure ; Electrical ; Thermal ; Proton conducting ceramic fuel cell (PCFC)
    Language English
    Dates of publication 2023-02
    Publishing place Elsevier Ltd
    Document type Article ; Online
    ISSN 0959-6526
    DOI 10.1016/j.jclepro.2022.135827
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  2. Article: Degradation of mixed cationic dye pollutant by metal free melem derivatives and graphitic carbon nitride

    Rani, Barkha / Nayak, Arpan Kumar / Sahu, Niroj Kumar

    Chemosphere. 2022 July, v. 298

    2022  

    Abstract: Graphitic carbon nitride (GCN), a polymeric metal free catalyst is widely used to degrade the toxic organic dye from the aqueous pollution. However, its catalytic efficiency and effective simultaneous reduction of mixed dye is still a challenge. Here, we ...

    Abstract Graphitic carbon nitride (GCN), a polymeric metal free catalyst is widely used to degrade the toxic organic dye from the aqueous pollution. However, its catalytic efficiency and effective simultaneous reduction of mixed dye is still a challenge. Here, we have tuned the physiochemical properties of the GCN and melem derivatives by facilely tuning the degree of polycondensation and examined their catalytic activity towards the removal of cationic dye individually and together in solution. Catalysts were synthesized by thermal treatment of low-cost melamine and characterized by XRD, FTIR, RAMAN, FE-SEM, EDX, UV-DRS, and FL spectroscopy to confirm materials' structure, phase, morphology and optical properties. A suitable phase of the catalyst (M−450) exhibited superior removal capacity with a high-rate constant compared to others. The results demonstrate that M−450 has a maximum loading efficacy of 2.13 and 1.12 mg g⁻¹ for methylene blue (MB) and Rhodamine B (RhB) dyes respectively in a single dye system. Attractively, when MB and RhB co-exist in the solution, the efficacy increased by 14% (2.44 mg g⁻¹) and 27% (1.43 mg g⁻¹) for MB and RhB respectively. The adsorption kinetics, stability, effect of pH and reusability of M−450 catalyst was testified. Further, radical scavenger experiments and terephthalic acid tests were carried out to explain the reaction mechanism involved in the degradation of textile dyes. Moreover, electron paramagnetic resonance (EPR) analysis validated the availability of hydroxyl radicals in the photocatalytic reaction. Excellent stability and reusability were attained even after five successive cycles, demonstrating a suitable photocatalyst for the efficient degradation of mixed dye.
    Keywords adsorption ; carbon nitride ; condensation reactions ; electron paramagnetic resonance spectroscopy ; fabrics ; graphene ; heat treatment ; melamine ; methylene blue ; pH ; photocatalysis ; photocatalysts ; pollutants ; pollution ; polymers ; reaction mechanisms ; rhodamines ; toxicity
    Language English
    Dates of publication 2022-07
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2022.134249
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 2540: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

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  3. Article ; Online: Degradation of mixed cationic dye pollutant by metal free melem derivatives and graphitic carbon nitride.

    Rani, Barkha / Nayak, Arpan Kumar / Sahu, Niroj Kumar

    Chemosphere

    2022  Volume 298, Page(s) 134249

    Abstract: Graphitic carbon nitride (GCN), a polymeric metal free catalyst is widely used to degrade the toxic organic dye from the aqueous pollution. However, its catalytic efficiency and effective simultaneous reduction of mixed dye is still a challenge. Here, we ...

    Abstract Graphitic carbon nitride (GCN), a polymeric metal free catalyst is widely used to degrade the toxic organic dye from the aqueous pollution. However, its catalytic efficiency and effective simultaneous reduction of mixed dye is still a challenge. Here, we have tuned the physiochemical properties of the GCN and melem derivatives by facilely tuning the degree of polycondensation and examined their catalytic activity towards the removal of cationic dye individually and together in solution. Catalysts were synthesized by thermal treatment of low-cost melamine and characterized by XRD, FTIR, RAMAN, FE-SEM, EDX, UV-DRS, and FL spectroscopy to confirm materials' structure, phase, morphology and optical properties. A suitable phase of the catalyst (M-450) exhibited superior removal capacity with a high-rate constant compared to others. The results demonstrate that M-450 has a maximum loading efficacy of 2.13 and 1.12 mg g
    MeSH term(s) Coloring Agents ; Environmental Pollutants ; Graphite ; Heterocyclic Compounds, 3-Ring ; Metals ; Methylene Blue ; Nitrogen Compounds ; Triazines
    Chemical Substances Coloring Agents ; Environmental Pollutants ; Heterocyclic Compounds, 3-Ring ; Metals ; Nitrogen Compounds ; Triazines ; graphitic carbon nitride ; melem ; Graphite (7782-42-5) ; Methylene Blue (T42P99266K)
    Language English
    Publishing date 2022-03-09
    Publishing country England
    Document type Journal Article
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2022.134249
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 2540: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

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  4. Article ; Online: Reticular synthesis of two-dimensional ionic covalent organic networks as metal-free bifunctional electrocatalysts for oxygen reduction and evolution reactions.

    Jhariat, Pampa / Warrier, Arjun / Sasmal, Ananta / Das, Subhadip / Sarfudeen, Shafeeq / Kumari, Priyanka / Nayak, Arpan Kumar / Panda, Tamas

    Nanoscale

    2024  Volume 16, Issue 11, Page(s) 5665–5673

    Abstract: Bifunctional electrocatalysts for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) are the heart of metal-air batteries, fuel cells, and other energy storage systems. Here, we report a series of a novel class of redox-active ... ...

    Abstract Bifunctional electrocatalysts for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) are the heart of metal-air batteries, fuel cells, and other energy storage systems. Here, we report a series of a novel class of redox-active viologen-based ionic covalent organic networks (vCONs) which are directly used as metal-free bifunctional electrocatalysts towards ORR and OER applications. These vCONs (named vGC, vGAC, vMEL and vBPDP) were synthesized by the well-known Zincke reaction. The installation of redox-active viologen moieties among the extended covalent organic architectures played a crucial role for exceptional acid/base stability, as well as bifunctional ORR and OER activities, confirmed by the cyclic voltammetry (CV) curves. Among all of them, vBPDP showed high ORR efficiency with a half-wave potential of 0.72 V against a reversible hydrogen electrode (RHE) in 1 M KOH electrolyte. In contrast, vMEL demonstrated high OER activity with an overpotential of 320 mV at a current density of 10 mAcm
    Language English
    Publishing date 2024-03-14
    Publishing country England
    Document type Journal Article
    ZDB-ID 2515664-0
    ISSN 2040-3372 ; 2040-3364
    ISSN (online) 2040-3372
    ISSN 2040-3364
    DOI 10.1039/d3nr05277j
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  5. Article: Recent advancement of biomass-derived porous carbon based materials for energy and environmental remediation applications

    Chakraborty, Rishika / K, Vilya / Pradhan, Mukul / Nayak, Arpan Kumar

    Journal of materials chemistry A. 2022 Mar. 30, v. 10, no. 13

    2022  

    Abstract: In recent times, increasing environmental pollution alongside depletion of fossil fuel reserves has led to a rejuvenated interest in utilizing biomass and waste materials. Advanced porous carbons derived from such abundantly available and carbon rich ... ...

    Abstract In recent times, increasing environmental pollution alongside depletion of fossil fuel reserves has led to a rejuvenated interest in utilizing biomass and waste materials. Advanced porous carbons derived from such abundantly available and carbon rich feedstock precursors have been extensively used for clean energy storage and environmental remediation applications. This is credited to the exclusive properties like high specific surface area with tunable pore size, developed pore architecture and chemical stability. Simultaneously, several techniques have been progressively designed and upgraded for pollutant abatement in terms of economical and facile methodologies. The review aims to highlight the importance of biomass/waste-derived nanoporous carbon materials for energy and environmental applications. Various bio-synthetic activation methods and up to date research activities in the design and sustainable development of such state-of-the-art materials have been introduced. In addition, promising applications of nanoporous carbons in electrochemical systems and for environmental protection are briefly reviewed. Finally, current challenges and strategies for future research are summarized. It is expected that this review paper would assist the reader to acquire concise and systematic information as well as contribute novel ideas over a wide spectrum of disciplines.
    Keywords biomass ; carbon ; clean energy ; electrochemistry ; energy ; feedstocks ; fossil fuels ; nanopores ; pollutants ; pollution ; porosity ; remediation ; surface area ; sustainable development
    Language English
    Dates of publication 2022-0330
    Size p. 6965-7005.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/d1ta10269a
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  6. Article: Microwave-Assisted Greener Synthesis of Defect-Rich Tungsten Oxide Nanowires with Enhanced Photocatalytic and Photoelectrochemical Performance

    Nayak, Arpan Kumar / Debabrata Pradhan

    Journal of physical chemistry. 2018 Feb. 15, v. 122, no. 6

    2018  

    Abstract: Exploring semiconductor materials with superior photocatalytic activity is desirable to mitigate the crisis associated with rapid depletion of fossil fuels and environmental pollutions. Herein we report the synthesis of orthorhombic stacked WO3·H2O ... ...

    Abstract Exploring semiconductor materials with superior photocatalytic activity is desirable to mitigate the crisis associated with rapid depletion of fossil fuels and environmental pollutions. Herein we report the synthesis of orthorhombic stacked WO3·H2O square nanoplates by mixing WCl6 (0.025 M) in ethanol at room temperature via a precipitation method. On the other hand, hierarchical urchin-like W18O49 nanostructures composed of nanowires were synthesized from the preceding solution within 10 min through a microwave-assisted route. The morphology evolution from nanoplates to nanowires proceeds through a dissolution and recrystallization mechanism, as demonstrated in detail by varying the reaction duration and temperature. The as-synthesized WO3·H2O nanoplates and W18O49 nanowires were employed for the photocatalytic degradation of rhodamine B and photoelectrocatalytic hydrogen generation through water splitting in a neutral medium. Furthermore, the as-synthesized W18O49 nanostructures are employed as electrocatalysts for hydrogen evolution reaction in both acidic and neutral electrolytes. The enhanced electrocatalytic and photocatalytic activity of W18O49 nanostructures are attributed to their larger surface area, oxygen vacancies, and faster charge transport properties. This work demonstrates a greener and simpler way to synthesize a promising defect-rich material (W18O49) in a short duration and its potential in electrocatalytic and photoelectrocatalytic hydrogen generation, and for degradation of pollutant.
    Keywords ambient temperature ; crystallization ; electrolytes ; ethanol ; fossil fuels ; hydrogen production ; microwave treatment ; mixing ; nanowires ; oxygen ; photocatalysis ; pollutants ; rhodamines ; semiconductors ; surface area ; tungsten oxide
    Language English
    Dates of publication 2018-0215
    Size p. 3183-3193.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1932-7455
    DOI 10.1021/acs.jpcc.7b09479
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  7. Article ; Online: Investigation of electrical transport properties in solution-processed Bi

    Chakraborty, Rishika / Das, Sutanu / Rudra, Siddheswar / Nayak, Arpan Kumar / Maji, Pradip K / Nandi, Upendranath / Pradhan, Mukul

    Physical chemistry chemical physics : PCCP

    2023  Volume 25, Issue 20, Page(s) 14606–14617

    Abstract: In this paper, we report the fundamental electrical transport properties measured in ... ...

    Abstract In this paper, we report the fundamental electrical transport properties measured in Bi
    Language English
    Publishing date 2023-05-24
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/d3cp00642e
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  8. Article ; Online: Shape and Phase-Controlled One-Pot Synthesis of Air Stable Cationic AgCdS Nanocrystals, Optoelectronic and Electrochemical Hydrogen Evolution Studies.

    Chaturvedi, Jyotsna / Munthasir, Akkarakkaran Thayyil Muhammed / Nayak, Arpan Kumar / Tripathi, Laxmi Narayan / Thilagar, Pakkirisamy / Jagirdar, Balaji R

    Small methods

    2023  Volume 8, Issue 1, Page(s) e2300907

    Abstract: CdS-based materials are extensively studied for photocatalytic water splitting. By incorporating ... ...

    Abstract CdS-based materials are extensively studied for photocatalytic water splitting. By incorporating Ag
    Language English
    Publishing date 2023-10-17
    Publishing country Germany
    Document type Journal Article
    ISSN 2366-9608
    ISSN (online) 2366-9608
    DOI 10.1002/smtd.202300907
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  9. Article: High Performance Solid-State Asymmetric Supercapacitor using Green Synthesized Graphene–WO3 Nanowires Nanocomposite

    Nayak, Arpan Kumar / Das Ashok Kumar / Pradhan Debabrata

    ACS sustainable chemistry . 2017 Nov. 06, v. 5, no. 11

    2017  

    Abstract: Development of active materials capable of delivering high specific capacitance is one of the present challenges in supercapacitor applications. Herein, we report a facile and green solvothermal approach to synthesize graphene supported tungsten oxide ( ... ...

    Abstract Development of active materials capable of delivering high specific capacitance is one of the present challenges in supercapacitor applications. Herein, we report a facile and green solvothermal approach to synthesize graphene supported tungsten oxide (WO₃) nanowires as an active electrode material. As an active electrode material, the graphene–WO₃ nanowire nanocomposite with an optimized weight ratio has shown excellent electrochemical performance with a specific capacitance of 465 F g–¹ at 1 A g–¹ and a good cycling stability of 97.7% specific capacitance retention after 2000 cycles in 0.1 M H₂SO₄ electrolyte. Furthermore, a solid-state asymmetric supercapacitor (ASC) was fabricated by pairing a graphene–WO₃ nanowire nanocomposite as a negative electrode and activated carbon as a positive electrode. The device has delivered an energy density of 26.7 W h kg–¹ at 6 kW kg–¹ power density, and it could retain 25 W h kg–¹ at 6 kW kg–¹ power density after 4000 cycles. The high energy density and excellent capacity retention obtained using a graphene–WO₃ nanowire nanocomposite demonstrate that it could be a promising material for the practical application in energy storage devices.
    Keywords activated carbon ; capacitance ; electrochemistry ; electrodes ; electrolytes ; energy ; energy density ; graphene ; nanocomposites ; nanowires ; sulfuric acid ; tungsten oxide
    Language English
    Dates of publication 2017-1106
    Size p. 10128-10138.
    Publishing place American Chemical Society
    Document type Article
    ISSN 2168-0485
    DOI 10.1021/acssuschemeng.7b02135
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  10. Article ; Online: Amorphous-Crystalline Interfaces on Hollow Nanocubes Derived from Ir-Doped Ni-Fe-Zn Prussian Blue Analog Enables High Capability of Alkaline/Acidic/Saline Water Oxidations.

    Han, HyukSu / Kim, So Jung / Jung, Sun Young / Oh, Dongjo / Nayak, Arpan Kumar / Jang, Jin Uk / Bang, Junghwan / Yeo, Sunghwan / Shin, Tae Ho

    Small (Weinheim an der Bergstrasse, Germany)

    2023  Volume 19, Issue 49, Page(s) e2303912

    Abstract: Development of highly efficient and robust electrocatalysts for oxygen evolution reaction (OER) under specific electrolyte is a key to actualize commercial low-temperature water electrolyzers. Herein, a rational catalyst design strategy is first reported ...

    Abstract Development of highly efficient and robust electrocatalysts for oxygen evolution reaction (OER) under specific electrolyte is a key to actualize commercial low-temperature water electrolyzers. Herein, a rational catalyst design strategy is first reported based on amorphous-crystalline (a-c) interfacial engineering to achieve high catalytic activity and durability under diverse electrolytes that can be used for all types of low-temperature water electrolysis. Abundant a-c interface (ACI) is implemented into a hollow nanocubic (pre)-electrocatalyst which is derived from Ir-doped Ni-Fe-Zn Prussian blue analogues (PBA). The implemented c-a interface is well maintained during prolonged OER in alkaline, alkalized saline, and acidic electrolytes demonstrating its diverse functionality for water electrolysis. Notably, the final catalyst exhibits superior catalytic activity with excellent durability for OER compared to that of benchmark IrO
    Language English
    Publishing date 2023-08-23
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2168935-0
    ISSN 1613-6829 ; 1613-6810
    ISSN (online) 1613-6829
    ISSN 1613-6810
    DOI 10.1002/smll.202303912
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