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Electrodeposition and characterization of nickel–copper metallic foams for application as electrodes for supercapacitors

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Abstract

Nickel–copper metallic foams were electrodeposited from an acidic electrolyte, using hydrogen bubble evolution as a dynamic template. Their morphology and chemical composition was studied by scanning electron microscopy and related to the deposition parameters (applied current density and deposition time). For high currents densities (above 1 A cm−2) the nickel–copper deposits have a three-dimensional foam-like morphology with randomly distributed nearly-circular pores whose walls present an open dendritic structure. The nickel–copper foams are crystalline and composed of pure nickel and a copper-rich phase containing nickel in solid solution. The electrochemical behaviour of the material was studied by cyclic voltammetry and chronopotentiometry (charge–discharge curves) aiming at its application as a positive electrode for supercapacitors. Cyclic voltammograms showed that the Ni–Cu foams have a pseudocapacitive behaviour. The specific capacitance was calculated from charge–discharge data and the best value (105 F g−1 at 1 mA cm−2) was obtained for nickel–copper foams deposited at 1.8 A cm−2 for 180 s. Cycling stability of these foams was also assessed and they present a 90 % capacitance retention after 10,000 cycles at 10 mA cm−2.

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Acknowledgments

The authors would like to acknowledge financial support from Fundação para a Ciência e Tecnologia (FCT) under the project PTDC/CTM-MET/119411/2010 “Electrodeposition of oxide spinel films on stainless steel substrates for the development of new electrodes for supercapacitors”, COST Action MP1004-“Hybrid Energy Storage Devices and Systems for Mobile and Stationary Applications” and COST Action MP1106-“Smart and green interfaces—from single bubbles and drops to industrial, environmental and biomedical applications”

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Eugénio, S., Silva, T.M., Carmezim, M.J. et al. Electrodeposition and characterization of nickel–copper metallic foams for application as electrodes for supercapacitors. J Appl Electrochem 44, 455–465 (2014). https://doi.org/10.1007/s10800-013-0646-y

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