A Cost-Effective and High-Performance Core-Shell-Nanorod-Based ZnO/alpha-Fe2O3//ZnO/C Asymmetric Supercapacitor

Sarkar, Debasish and Das, Shyamashis and Sharada, c and Pal, Banabir and Rensmo, Hakan and Shukla, Ashok and Sarma, D D (2017) A Cost-Effective and High-Performance Core-Shell-Nanorod-Based ZnO/alpha-Fe2O3//ZnO/C Asymmetric Supercapacitor. In: JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 164 (6). A987-A994.

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Abstract

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. (C) The Author(s) 2017. Published by ECS.

Item Type:	Journal Article
Publication:	JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Additional Information:	Copy right for this article belongs to the ELECTROCHEMICAL SOC INC, 65 SOUTH MAIN STREET, PENNINGTON, NJ 08534 USA
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	10 Jun 2017 04:40
Last Modified:	10 Jun 2017 04:40
URI:	http://eprints.iisc.ac.in/id/eprint/57184

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