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Nanoengineering of NiO/MnO₂/GO Ternary Composite for Use in High-Energy Storage Asymmetric Supercapacitor and Oxygen Evolution Reaction (OER).

ABSTRACT: Designing multifunctional nanomaterials for high performing electrochemical energy conversion and storage devices has been very challenging. A number of strategies have been reported to introduce multifunctionality in electrode/catalyst materials including alloying, doping, nanostructuring, compositing, etc. Here, we report the fabrication of a reduced graphene oxide (rGO)-based ternary composite NiO/MnO₂/rGO (NMGO) having a range of active sites for enhanced electrochemical activity. The resultant sandwich structure consisted of a mesoporous backbone with NiO and MnO₂ nanoparticles encapsulated between successive rGO layers, having different active sites in the form of Ni-, Mn-, and C-based species. The modified structure exhibited high conductivity owing to the presence of rGO, excellent charge storage capacity of 402 F·g^-1 at a current density of 1 A·g^-1, and stability with a capacitance retention of ~93% after 14,000 cycles. Moreover, the NMGO//MWCNT asymmetric device, assembled with NMGO and multi-wall carbon nanotubes (MWCNTs) as positive and negative electrodes, respectively, exhibited good energy density (28 Wh·kg^-1), excellent power density (750 W·kg^-1), and capacitance retention (88%) after 6000 cycles. To evaluate the multifunctionality of the modified nanostructure, the NMGO was also tested for its oxygen evolution reaction (OER) activity. The NMGO delivered a current density of 10 mA·cm^-2 at the potential of 1.59 V versus RHE. These results clearly demonstrate high activity of the modified electrode with strong future potential.

SUBMITTER: Arshad N

PROVIDER: S-EPMC9823737 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature

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Nanoengineering of NiO/MnO<sub>2</sub>/GO Ternary Composite for Use in High-Energy Storage Asymmetric Supercapacitor and Oxygen Evolution Reaction (OER).

Arshad Natasha N Usman Muhammad M Adnan Muhammad M Ahsan Muhammad Tayyab MT Rehman Mah Rukh MR Javed Sofia S Ali Zeeshan Z Akram Muhammad Aftab MA Demopoulos George P GP Mahmood Asif A

Nanomaterials (Basel, Switzerland) 20221225 1

Designing multifunctional nanomaterials for high performing electrochemical energy conversion and storage devices has been very challenging. A number of strategies have been reported to introduce multifunctionality in electrode/catalyst materials including alloying, doping, nanostructuring, compositing, etc. Here, we report the fabrication of a reduced graphene oxide (rGO)-based ternary composite NiO/MnO<sub>2</sub>/rGO (NMGO) having a range of active sites for enhanced electrochemical activity. ...[more]

PMID: 36616009

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Project description:Biomass waste from grapefruit peel extract was used for the preparation of MgO-SiO2 composites in situ in order to develop effective electrocatalytic composites based on NiO/MgO-SiO2. The MgO-SiO2 composites were subsequently deposited with NiO using a modified hydrothermal method. The synthesized materials were analyzed to investigate their morphology, crystal structure, chemical composition, functional group, and optical band gap. The structural analysis allowed us to determine the orientation of the nanoparticles, the cubic phase of NiO and MgO, the significant loss of optical band gap, and the enriched functional groups on the surface of NiO/MgO-SiO2 composites. The electrochemical properties were investigated in the presence of an alkaline solution of KOH. To study the oxygen evolution reaction (OER) in 1 M KOH aqueous solution, different NiO/MgO-SiO2 composites were investigated. It was found that the NiO/MgO-SiO2 composite that contained the highest amount of MgO-SiO2 (sample 3) had a lower overpotential than the NiO/MgO-SiO2 composite with the lowest amount of MgO-SiO2. Sample 3 exhibited an overpotential of 230 mV at 10 mA cm-2 over a period of 40 hours with excellent stability. The superior electrochemical activity of the NiO/MgO-SiO2 composite (sample 3) was demonstrated in an energy storage device using 3 M KOH aqueous solution, and asymmetric supercapacitor devices were fabricated in 3 M KOH solution. According to the ASC's specifications, a specific capacitance of 344.12 F g-1 and an energy density of 7.31 W h kg-1 were found for the device at a fixed current density of 1.5 A g-1. After over 40 000 galvanic charge-discharge repeatable cycles at 1.5 A g-1, sample 3 of the NiO/MgO-SiO2 composite exhibited excellent cycling stability with 88.9% percent capacitance retention. During the performance evaluation of the NiO/MgO-SiO2 composites, grapefruit peel extract was confirmed as a potential biomass waste for the fabrication of high-performance energy conversion and storage devices.

Dataset Information

Nanoengineering of NiO/MnO₂/GO Ternary Composite for Use in High-Energy Storage Asymmetric Supercapacitor and Oxygen Evolution Reaction (OER).

Publications

Nanoengineering of NiO/MnO<sub>2</sub>/GO Ternary Composite for Use in High-Energy Storage Asymmetric Supercapacitor and Oxygen Evolution Reaction (OER).

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Nanoengineering of NiO/MnO2/GO Ternary Composite for Use in High-Energy Storage Asymmetric Supercapacitor and Oxygen Evolution Reaction (OER).

Publications

Nanoengineering of NiO/MnO<sub>2</sub>/GO Ternary Composite for Use in High-Energy Storage Asymmetric Supercapacitor and Oxygen Evolution Reaction (OER).

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets

Nanoengineering of NiO/MnO₂/GO Ternary Composite for Use in High-Energy Storage Asymmetric Supercapacitor and Oxygen Evolution Reaction (OER).