Abstract
Nanoporous nickel–copper metallic foams were electordeposited using hydrogen templating (DHBT) technique. The effect of deposition parameters (applied current density and deposition time) on surface morphology of the obtained layers was studied with the aid of SEM. The Ni–Cu electrodeposited layers were characterized by a porous dendritic structure. According to EDX analysis, increasing both the deposition time and applied current density leads to an increase of the Ni content in the nano-foams. These foams were tested as electrodes for supercapacitors in 1 M KOH solutions. From potentiodynamic polarization test, the corrosion rate was accelerated with increasing the deposition time up to 150 s as well as the deposition current density up to 1.8 A/cm2. The electrochemical behavior of the material was studied by cyclic voltammetry aiming at its application as positive electrodes for supercapacitors, using 1 M KOH solution. From cyclic voltammetry, toth the increase of applied current density and the deposition time lead to an increase of the current density and total charge measured by cyclic voltammetry, having a beneficial effect on the electrochemical activity of the Ni-Cu films. The highest forward current peak was obtained for nickel–copper foams deposited at 2 Acm-2 for 150 s. From EIS test, the polarization resistance (Rp) decreased with increasing the current density as well as electrodeposition time. The lowest polarization resistance was recorded for porous Ni-Cu layers electrodeposited at 2 A/cm2 for 150 sec, indicating high electrochemical activity of this layers (35.02%Cu) as electrodes for supercapacitors.
Highlights
Supercapacitors, one of the energy storage systems, are able to store and deliver energy at relatively high rates
Electrochemical Characterization Electrodeposited Ni-Cu Foams high power, made the supercapacitor fit a lot of applications like electric vehicles, cell phones, quick charge applications, e.g., wireless power tools, and medical applications (Conway, 1999)
There is an interest in using nano-structured materials for supercapacitor electrodes due to increased surface area and improved capacitive performance (Arbizzani et al, 2001)
Summary
Supercapacitors, one of the energy storage systems, are able to store and deliver energy at relatively high rates. The electrodeposited NMFs are formed on stainless steel substrates of high electronic conductivity and are beneficial for production of supercapacitor electrodes since the active materials are directly applied on the current collector (Shin et al, 2013). The surface morphology of the porous metal foam obtained by this process depends mainly on the electrodeposition parameters and bath composition. Porous nickel–copper metallic foams were electrodeposited on stainless steel substrates using the dynamic hydrogen bubbling template technique. This work discusses the effect of working parameters, such as the applied current density as well as deposition time, on the surface morphology and properties of electrodeposited layers. All measurements for all testing techniques were taken as an average of three measurements
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
