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A Cost-Effective and High-Performance Core-Shell-Nanorod-Based ZnO/alpha-Fe2O3//ZnO/C Asymmetric Supercapacitor
Indian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, India..
Indian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, India..
Indian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, India..
Indian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, India..
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2017 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 164, no 6, A987-A994 p.Article in journal (Refereed) Published
Abstract [en]

A novel core-shell design for nano-structured electrode materials is introduced for realizing cost-effective and high-performance supercapacitors. In the proposed core-shell design, thin shell-layers of highly pseudo-capacitive materials provide the platform for surface or near-surface-based faradaic and non-faradaic reactions together with shortened ion-diffusion path facilitating fast-ion intercalation and deintercalation processes. The highly-conducting core serves as highway for fast electron transfer toward current collectors, improving both energy and power performance characteristics of the core-shell structure in relation to pristine component materials. Furthermore, use of carbon (C)-based materials as a shell layer in either electrode not only enhances capacitive performance through double-layer formation but also provides enough mechanical strength to sustain volume changes in the core material during long-cycling of the supercapacitor improving its cycle life. In order to enhance electrochemical performance in terms of specific capacitance and rate capability via core-shell architecture and nano-structuring, an asymmetric supercapacitor (ASC) is assembled using ZnO/alpha-Fe2O3 and ZnO/C core-shell nanorods as respective negative and positive electrodes. The ASC exhibits a specific capacitance of similar to 115 F/g at a scan rate of 10 mV/s in a potential window as large as 1.8 V with a response time as short as 39 ms and retains more than 80% of its initial capacitance after 4000 cycles. Interestingly, the ASC can deliver an energy density of similar to 41 Wh/kg and a power density of similar to 7 kW/kg that are significantly higher than those reported hitherto for iron-oxide-based ASCs.

Place, publisher, year, edition, pages
ELECTROCHEMICAL SOC INC , 2017. Vol. 164, no 6, A987-A994 p.
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-323511DOI: 10.1149/2.0351706jesISI: 000401607500099OAI: oai:DiVA.org:uu-323511DiVA: diva2:1110684
Available from: 2017-06-16 Created: 2017-06-16 Last updated: 2017-06-16Bibliographically approved

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