Electrodeposition of sea-urchin and cauliflower-like Ni/Co doped manganese dioxide hierarchical nanostructures with improved energy storage behavior

Minakshi, M., Biswal, A. and Tripathy, B. (2016) Electrodeposition of sea-urchin and cauliflower-like Ni/Co doped manganese dioxide hierarchical nanostructures with improved energy storage behavior. ChemElectroChem, 3 (6). pp. 976-985.

Abstract

Transforming the existing Zn–MnO2 primary battery into a secondary battery with enhanced storage behavior and a low cost is of significant interest. Such technology could underpin future energy-storage development. To acquire this, doped electrolytic manganese dioxide (EMD) with hierarchical nanoarchitectures have been employed as a cathode in the Zn–MnO2 system. EMD is synthesized from manganese sulfate in a sulfuric acid bath with in situ doping of nickel and cobalt ions individually. Sea-urchin-shaped EMD has been obtained with nickel as a dopant, whereas cauliflower- and pyramidal-shaped hierarchical nanostructures are observed with cobalt as a dopant, using a facile galvanostatic method without employing any template or surfactant. The structural studies indicated that all EMD samples (in the absence and presence of dopants) are predominantly composed of gamma-type manganese dioxide; however, the peak intensity increased with increasing concentration of the dopants. The electrochemical results revealed that the Co-doped EMD composite played a crucial role in increasing the storage capacity of the Zn–MnO2 battery, whereas the Ni-doped EMD composite resulted in improved longevity compared the Co-doped and undoped counterparts. The EMD composites individually doped with Ni and Co resulted in improved storage behaviors of 395 and 670 mA h g−1, respectively, against the undoped sample which is 220 mA h g−1, implying that the presence of Co3O4 and mesoporous nanostructured surfaces enhanced the fast kinetics of electrochemical reactions.

Publication Type:	Journal Article
Murdoch Affiliation:	School of Engineering and Information Technology
Publisher:	Wiley
Copyright:	© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
URI:	http://researchrepository.murdoch.edu.au/id/eprint/30932

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