Vol.:(0123456789) 1 3 Journal of Applied Electrochemistry https://doi.org/10.1007/s10800-018-1229-8 RESEARCH ARTICLE Facile synthesis of nano dendrite-structured Ni–NiO foam/ERGO by constant current method for supercapacitor applications Majid Mirzaee 1  · Changiz Dehghanian 1  · Sahand Sarbishei 2 Received: 13 March 2018 / Accepted: 7 June 2018 © Springer Nature B.V. 2018 Abstract This study introduces a novel, non-toxic, scalable, two-step method for the fabrication of highly nanoporous nickel and nickel oxide (Ni–NiO) foam/Electrochemically reduced graphene oxide (ERGO) electrodes with exceptional capacitance suitable for supercapacitor application. This procedure includes drop cast and graphene oxide (GO) reduction by galvano- static process. To create the electrodes, electrodeposition process and selective electrochemical dealloying accompanied by a hydrogen evolution reaction (HER) were performed on a copper substrate. Afterwards, drop cast and galvanostatic processes were accomplished to coat GO nanosheets on Ni–NiO foam. The structure of achieved nanocomposites was investigated by scanning electron microscopy (SEM), X-ray difraction (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). High-specifc capacitance of 1995 F g −1 at a current density of 1 A g −1 (galvanostatic charge–discharge) (GCD) was achieved for the Ni–NiO foam/electrochemically reduced graphene oxide (ERGO) electrode with excellent cycling stability. A constant, high-specifc capacitance (95.1% of the initial value) was achieved after 6000 cycles at 20 A g −1 . Graphical Abstract Keywords ERGO · Ni–NiO foam · Supercapacitor · Electrochemical reduction · Constant current Extended author information available on the last page of the article