Facile synthesis of MnO2-Cu composite electrode for high performance supercapacitor

Kumar, A.; Thomas, Arpit; Gupta, Anshu; Garg, Mayank; Singh, Jagdeep; Perumal, G.; Sujithkrishnan, Elayaperumal; Elumalai, Perumal; Arora, Harpreet Singh

doi:10.1016/j.est.2021.103100

Cited by 19 publications

(6 citation statements)

References 32 publications

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“…The difference in surface evolution of the as-cast alloy and the SFP alloy is attributed to the wide difference in their surface energy and wettability. The higher surface energy of the fine-grained, processed alloy accelerates the reaction kinetics, while the increased hydrophilicity ensures enhanced surface wetting and better dealloying through electrolyte infiltration within the fine channels. , The surface of the processed NiMn alloy was further studied through high-resolution electron microscopy. Figure a shows uniform distribution of fine pores on the surface with a pore size of 10 ± 2 nm (Figure b).…”

Section: Resultsmentioning

confidence: 99%

Oxygen-Vacancy Abundant Nanoporous Ni/NiMnO₃/MnO₂@NiMn Electrodes with Ultrahigh Capacitance and Energy Density for Supercapacitors

Thomas

Kumar

Perumal

et al. 2023

ACS Appl. Mater. Interfaces

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High-performance energy storage devices (HPEDs) play a critical role in the realization of clean energy and thus enable the overarching pursuit of nonpolluting, green technologies. Supercapacitors are one class of such lucrative HPEDs; however, a serious limiting factor of supercapacitor technology is its sub-par energy density. This report presents hitherto unchartered pathway of physical deformation, chemical dealloying, and microstructure engineering to produce ultrahigh-capacitance, energy-dense NiMn alloy electrodes. The activated electrode delivered an ultrahigh specific-capacitance of 2700 F/cm3 at 0.5 A/cm3. The symmetric device showcased an excellent energy density of 96.94 Wh/L and a remarkable cycle life of 95% retention after 10,000 cycles. Transmission electron microscopy and atom probe tomography studies revealed the evolution of a unique hierarchical microstructure comprising fine Ni/NiMnO3 nanoligaments within MnO2-rich nanoflakes. Theoretical analysis using density functional theory showed semimetallic nature of the nanoscaled oxygen-vacancy-rich NiMnO3 structure, highlighting enhanced carrier concentration and electronic conductivity of the active region. Furthermore, the geometrical model of NiMnO3 crystals revealed relatively large voids, likely providing channels for the ion intercalation/de-intercalation. The current processing approach is highly adaptable and can be applied to a wide range of material systems for designing highly efficient electrodes for energy-storage devices.

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Section: Resultsmentioning

confidence: 99%

Oxygen-Vacancy Abundant Nanoporous Ni/NiMnO₃/MnO₂@NiMn Electrodes with Ultrahigh Capacitance and Energy Density for Supercapacitors

Thomas

Kumar

Perumal

et al. 2023

ACS Appl. Mater. Interfaces

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“…Galvanostatic charge−discharge (GCD) testing was also performed to quantify the capacitance of the fabricated devices' capacitance. The specific capacitance (C, F g −1 ), specific energy density (E, Wh kg −1 ), and specific power density (P, W kg −1 ) were calculated using the formulas 76,77…”

Section: Ndmentioning

confidence: 99%

Flexible, Thermally Stable, and Ultralightweight Polyimide-CNT Aerogel Composite Films for Energy Storage Applications

Aghababaei Tafreshi,

Saadatnia,

Ghaffari-Mosanenzadeh

et al. 2023

ACS Appl. Mater. Interfaces

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Polyimide (PI) aerogels are promising in various fields of application, ranging from thermal insulators to aerospace. However, they are typically in the form of a bulk monolith, which suffers from a lack of conformability and drapability. Moreover, their electrical conductivity is limited, and they mainly display an insulative behavior. These shortcomings can limit the applications of PI aerogels in energy storage systems, which require ultralightweight flexible conductive films, which at the same time offer high thermal stability, ultralow density, and high surface area. To overcome these obstacles, the present study reports the fabrication of PI-carbon nanotube (PI-CNT) aerogel composite films with varying CNT content prepared through a sol−gel preparation method, followed by a supercritical drying procedure. Compared to pristine PI aerogels, which displayed a large shrinkage and density of 18.3% and 0.12 g cm −3 , respectively, the incorporation of only 5 wt % CNTs resulted in a significant reduction of both shrinkage and density to only 11.5% and 0.10 g cm −3 , respectively. This suggests the importance of CNTs in improving the dimensional stability of aerogels and creating a robust network. Further characterizations showed that incorporation of 5 wt % CNTs also resulted in the highest pore volume (1.25 cm 3 g −1 ), highest surface area (324 m 2 g −1 ), highest real permittivity (80), highest electrical conductivity (3 × 10 −1 S m −1 ), and ultrahigh service temperature (575 °C). It was also shown that the aerogel films can withstand a large degree of bending, can be twisted, and can be fully rolled with no obvious cracks propagated in the structure. The combined outstanding properties of the developed aerogel composite films make them promising potential candidates for supercapacitor electrodes. Therefore, the electrochemical performance of the devices based on aerogel electrodes was further studied. The device demonstrated a high energy density of 2.6 Wh kg −1 at a power density of 303.8 W kg −1 . The total capacitance after 5000 cycles was 91.8% of the initial capacitance, which indicated excellent stability and durability of the device. Overall, this work provides a facile yet effective methodology for the development of high-performance aerogel materials for energy storage applications.

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“…10d ). Moreover, Kumar et al 44 reported the synthesis of nanoporous MnO 2 –Cu structures by a facile method utilizing surface deformation and selective dealloying in the Cu–Mn system ( Fig. 10e ).…”

Section: Engineering Strategies To Improve Electrochemical Performancementioning

confidence: 99%

“…40 Therefore, researchers have usually worked on combining MnO 2 with highly conductive substrates (e.g., metals or carbon-based materials) in order to enhance the whole performances. A series of MnO 2 -based composites have been designed, including MnO 2 /precious metal (gold, silver) composites, [41][42][43] MnO 2 /transition metal (Cu, Ni, Mn) composites, [44][45][46][47] MnO 2 / graphene composites, [48][49][50] MnO 2 /carbon nanotube (CNT) composites, 51,52 MnO 2 /porous carbon composites, 53,54 etc. Up to now, MnO 2 -based materials have got good experiment and calculation results in aspects of enhanced electrical conductivity and improved specic surface area, and they have also been reviewed extensively from different perspectives.…”

Section: Introductionmentioning

confidence: 99%

MnO₂-based materials for supercapacitor electrodes: challenges, strategies and prospects

et al. 2022

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Facile synthesis of MnO2-Cu composite electrode for high performance supercapacitor

Cited by 19 publications

References 32 publications

Oxygen-Vacancy Abundant Nanoporous Ni/NiMnO₃/MnO₂@NiMn Electrodes with Ultrahigh Capacitance and Energy Density for Supercapacitors

Oxygen-Vacancy Abundant Nanoporous Ni/NiMnO₃/MnO₂@NiMn Electrodes with Ultrahigh Capacitance and Energy Density for Supercapacitors

Flexible, Thermally Stable, and Ultralightweight Polyimide-CNT Aerogel Composite Films for Energy Storage Applications

MnO₂-based materials for supercapacitor electrodes: challenges, strategies and prospects

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Facile synthesis of MnO2-Cu composite electrode for high performance supercapacitor

Cited by 19 publications

References 32 publications

Oxygen-Vacancy Abundant Nanoporous Ni/NiMnO3/MnO2@NiMn Electrodes with Ultrahigh Capacitance and Energy Density for Supercapacitors

Oxygen-Vacancy Abundant Nanoporous Ni/NiMnO3/MnO2@NiMn Electrodes with Ultrahigh Capacitance and Energy Density for Supercapacitors

Flexible, Thermally Stable, and Ultralightweight Polyimide-CNT Aerogel Composite Films for Energy Storage Applications

MnO2-based materials for supercapacitor electrodes: challenges, strategies and prospects

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Oxygen-Vacancy Abundant Nanoporous Ni/NiMnO₃/MnO₂@NiMn Electrodes with Ultrahigh Capacitance and Energy Density for Supercapacitors

Oxygen-Vacancy Abundant Nanoporous Ni/NiMnO₃/MnO₂@NiMn Electrodes with Ultrahigh Capacitance and Energy Density for Supercapacitors

MnO₂-based materials for supercapacitor electrodes: challenges, strategies and prospects