Papers by Achal Singh Keshari
Amorphous MnO<sub><i>x</i></sub> Nanostructure/Multiwalled Carbon Nanotube Composites as Electrode Materials for Supercapacitor Applications
ACS applied nano materials, May 25, 2022
Sucrose-assisted one step hydrothermal synthesis of MnCO3/Mn3O4 hybrid materials for electrochemical energy storage
Electrochimica Acta, 2022
Vacuum, Jul 1, 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.
Interfacially coupled thin sheet-like NiO/NiMoO<sub>4</sub> nanocomposites synthesized by a simple reflux method for excellent electrochemical performance
Dalton Transactions, 2022
One-pot simple and cost-effective reflux synthesis of a hierarchical sheet-like NiO/NiMoO4 nanoco... more One-pot simple and cost-effective reflux synthesis of a hierarchical sheet-like NiO/NiMoO4 nanocomposite exhibits excellent electrochemical performance and promissing applicability as a positive electrode material in the assembled device.
Rapid microwave-assisted vs. hydrothermal synthesis of hierarchical sheet-like NiO/NiMoO4 hybrid nanostructures for high performance extrinsic pseudocapacitor application
Journal of energy storage, Aug 1, 2021
Abstract Combinations of pseudocapacitive materials such as metal oxides and metal molybdates are... more Abstract Combinations of pseudocapacitive materials such as metal oxides and metal molybdates are one of the extensively interested hybrid electrode materials for pseudocapacitor application. Various synthetic protocols along with structural parameters of the obtained products are crucial to achieve desired electrochemical properties for electrode materials. Herein, sheet-like hierarchical NiO/NiMoO4 (NNMO) hybrid nanostructures are synthesized by one-step rapid & energy saving green microwave-assisted approach (M-NNMO) and compared their physicochemical-electrochemical properties with hydrothermally synthesized H-NNMO. The as-synthesized materials are characterized by various spectroscopic and microscopic techniques. As an electroactive pseudocapacitive material, M-NNMO shows maximum specific capacity of 459.0 Cg−1 (1147.5 Fg−1), while H-NNMO delivers specific capacity of 271.1 Cg−1 (677.8 Fg−1) at a current density of 1 Ag−1. The superior performance of the M-NNMO is closely related to its low crystallinity, high bulk (147.9 m2g−1)/ electroactive surface area (26.7 cm2), and mesoporosity within hierarchical assembly. Furthermore, asymmetric supercapacitors are fabricated by NNMOs nanostructures as the positive and commercial activated carbon as the negative electrode. M-NNMO//AC device exhibits maximum specific capacity of 203.0 Cg−1, promising specific energy/ power of 38.6 Whkg−1/ 685.2 WKg−1, while H-NNMO//AC shows specific capacity of 169.5 Cg−1, specific energy and power of 32.4 Whkg−1 and 688.6 WKg−1, respectively, at a current density of 1 Ag−1. Maximum cyclability (~84% capacity retention after 2250 cycles) of H-NNMO//AC may be correlated with better crystallinity and thermal/ structural stability of H-NNMO hybrid nanostructure. Based on results, we suggest that the NNMO hybrid nanostructures can be promising electrode materials for electrochemical energy storage application.
Amorphous MnOx Nanostructure/Multiwalled Carbon Nanotube Composites as Electrode Materials for Supercapacitor Applications
ACS Applied Nano Materials
Interfacially coupled thin sheet-like NiO/NiMoO4 nanocomposites synthesized by a simple reflux method for excellent electrochemical performance
Dalton Transactions, 2022
One-pot simple and cost-effective reflux synthesis of a hierarchical sheet-like NiO/NiMoO4 nanoco... more One-pot simple and cost-effective reflux synthesis of a hierarchical sheet-like NiO/NiMoO4 nanocomposite exhibits excellent electrochemical performance and promissing applicability as a positive electrode material in the assembled device.
Sucrose-assisted one step hydrothermal synthesis of MnCO3/Mn3O4 hybrid materials for electrochemical energy storage
Electrochimica Acta, 2021
Vacuum, 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.
Rapid microwave-assisted vs. hydrothermal synthesis of hierarchical sheet-like NiO/NiMoO4 hybrid nanostructures for high performance extrinsic pseudocapacitor application
Journal of Energy Storage, 2021
Abstract Combinations of pseudocapacitive materials such as metal oxides and metal molybdates are... more Abstract Combinations of pseudocapacitive materials such as metal oxides and metal molybdates are one of the extensively interested hybrid electrode materials for pseudocapacitor application. Various synthetic protocols along with structural parameters of the obtained products are crucial to achieve desired electrochemical properties for electrode materials. Herein, sheet-like hierarchical NiO/NiMoO4 (NNMO) hybrid nanostructures are synthesized by one-step rapid & energy saving green microwave-assisted approach (M-NNMO) and compared their physicochemical-electrochemical properties with hydrothermally synthesized H-NNMO. The as-synthesized materials are characterized by various spectroscopic and microscopic techniques. As an electroactive pseudocapacitive material, M-NNMO shows maximum specific capacity of 459.0 Cg−1 (1147.5 Fg−1), while H-NNMO delivers specific capacity of 271.1 Cg−1 (677.8 Fg−1) at a current density of 1 Ag−1. The superior performance of the M-NNMO is closely related to its low crystallinity, high bulk (147.9 m2g−1)/ electroactive surface area (26.7 cm2), and mesoporosity within hierarchical assembly. Furthermore, asymmetric supercapacitors are fabricated by NNMOs nanostructures as the positive and commercial activated carbon as the negative electrode. M-NNMO//AC device exhibits maximum specific capacity of 203.0 Cg−1, promising specific energy/ power of 38.6 Whkg−1/ 685.2 WKg−1, while H-NNMO//AC shows specific capacity of 169.5 Cg−1, specific energy and power of 32.4 Whkg−1 and 688.6 WKg−1, respectively, at a current density of 1 Ag−1. Maximum cyclability (~84% capacity retention after 2250 cycles) of H-NNMO//AC may be correlated with better crystallinity and thermal/ structural stability of H-NNMO hybrid nanostructure. Based on results, we suggest that the NNMO hybrid nanostructures can be promising electrode materials for electrochemical energy storage application.
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Papers by Achal Singh Keshari