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Realizing an Asymmetric Supercapacitor Employing Carbon Nanotubes Anchored to Mn3O4 Cathode and Fe3O4 Anode

Kumar, Ankit and Sarkar, Debasish and Mukherjee, Soham and Patil, Satish and Sarma, DD and Shukla, Ashok (2018) Realizing an Asymmetric Supercapacitor Employing Carbon Nanotubes Anchored to Mn3O4 Cathode and Fe3O4 Anode. In: ACS APPLIED MATERIALS & INTERFACES, 10 (49). pp. 42484-42493.

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Official URL: https://doi.org/10.1021/acsami.8b16639

Abstract

A facile route to anchor pseudocapacitive materials on multiwalled carbon nanotubes (CNTs) to realize high-performance electrode materials for asymmetric super capacitors (ASCs) is reported. The anchoring process is developed after direct decomposition of metal-hexacyanoferrate complex on the CNT surface. Transmission electron microscopy (TEM) analysis reveals that the nanoparticles (NPs) are discretely attached over the CNT surface without forming a uniform layer, thus making most of the entire NP surface available for electrochemical reactions. Accordingly, CNT-Mn3O4 nanocomposite cathode shows significantly improved capacitive performance as compared to pristine CNT electrode, validating the efficacy of designing the composite electrode. With CNT-Fe3O4 nanocomposite as the paired anode, the hybrid ASC delivers a specific capacitance of 135.2 F/g at a scan rate of 10 mV/s within a potential window of 0-1.8 V in the aqueous electrolyte and retains almost 100% of its initial capacitance after 15,000 cycles. The serially connected ASCs can power commercial light-emitting diodes (LEDs) and mobile phones, reflecting their potential in next-generation storage applications.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to AMER CHEMICAL SOC
Keywords: pseudocapacitive materials; carbon nanotubes; metal-hexacyanoferrate complex; asymmetric supercapacitor; high power density; cycling stability
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Depositing User: Id for Latest eprints
Date Deposited: 28 Jan 2019 06:07
Last Modified: 28 Jan 2019 06:07
URI: http://eprints.iisc.ac.in/id/eprint/61448

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