Potentiodynamic deposition of composition influenced Co1-xNix LDHs thin film electrode for redox supercapacitors

Current paper comprises the electrodeposition of nanostructured porous Co1-xNix layered double hydroxide (Co1-xNix LDHs) thin films on to stainless steel substrate by a potentio-dynamic mode. The compositional impacts on the various properties of Co1-xNix LDHs are examined via structural, morphological, surface wettability and electrochemical studies. The nanocrystalline Co1-xNix LDHs thin films possess varying porous, nanoflake like morphology and superhydrophilic behavior by the composition influence. Electrochemical studies demonstrate the supercapacitive performance of Co1-xNix LDHs thin film electrodes. The maximal specific capacitance for Co1-xNix LDHs electrode is found to be similar to 1213 F g(-1) for composition Co0.66Ni0.34LDH in 2 M KOH electrolyte at 5 mV s(-1) scan rate owing specific energy of 104 Whkg(-1), specific power of 1.44 kW kg(-1) with similar to 94% of coulomb efficiency and stability of electrode retained to 77% after 10,000th cycle. The high capacitance retention proposes the deposited Co1-xNix LDHs thin film as promising contender for supercapacitor applications. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.