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Facile preparation of hierarchical MgCo2O4/MgCo2O4 nanochain array composites on Ni foam as advanced electrode materials for supercapacitors

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Abstract

The construction and synthesis of nanoarchitectures on a cost-effective substrate with eco-friendly properties has emerged as a novel strategy for synthesizing high-performance power and energy sources. In recent years, transition ternary metal oxides (TTMOs), especially combining similar-type TTMOs, have attracted extensive attention as favorable candidates for electrode materials. Among all the well-known TTMOs, MgCo2O4 is a stupendous one, owing to its excellent theoretical capacitance. Electrochemical calculations indicate that composites consisting of binary MgCo2O4 nanoflake arrays (MCO NFAs) and MgCo2O4/MgCo2O4 nanochain arrays (MCO/MCO NCAs) exhibit a hierarchical structure with a highly altered electronic nanostructure, providing better electrical conductivity, enhanced catalytic conditions, and enhanced supercapacitive performance. Under optimized conditions, the binary MCO NFA and composite MCO/MCO NCA structures offer more active sites and charge transfer during the faradaic reaction process. Most importantly, the binary MCO NFA and MCO/MCO NCA composite electrodes show high specific capacities of ∼316.8 and 265.3 mA h g−1 at a current density of 2 A g−1. Interestingly, the MCO/MCO NCA composite electrode still maintained an outstanding rate capability with 97.9% of the capacity retained after 5000 cycles at a current density of 6 A g−1. Therefore, the MCO/MCO NCA composite material fabricated via the combination of similar types of TTMO grown on low-cost Ni foam is certainly promising for more research and application in SCs.

Graphical abstract: Facile preparation of hierarchical MgCo2O4/MgCo2O4 nanochain array composites on Ni foam as advanced electrode materials for supercapacitors

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Supplementary files

Article information


Submitted
20 Dec 2019
Accepted
03 Feb 2020
First published
04 Feb 2020

New J. Chem., 2020, Advance Article
Article type
Paper

Facile preparation of hierarchical MgCo2O4/MgCo2O4 nanochain array composites on Ni foam as advanced electrode materials for supercapacitors

Y. Anil Kumar, S. Singh, P. J. S. Rana, K. D. Kumar and H. Kim, New J. Chem., 2020, Advance Article , DOI: 10.1039/C9NJ06318H

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