Fabrication of symmetric solid-state Ni(OH)2/MWCNT/ACG supercapacitor and more investigation of surface morphology on its capacitive behavior

Many studies have been done to control the electrochemical performance of electrodes for use in supercapacitors. Depending on the morphology, size, and structure of the material used in electrode design, the fabricated electrode exhibits supercapacitor or battery-like behavior. In this work, we report the easy electrochemical synthesis of Ni(OH)2/MWCNT onto Anodize Commercial Graphite (ACG) sheet electrode and the effect deposition time of Ni(OH)2 on the supercapacitor behavior of the electrode. Ni(OH)2/MWCNT/ACG sheet electrode was easily fabricated through electrochemical anodization of commercial graphite sheet followed by electrodeposition of MWCNT and Ni(OH)2 at different times. The effect of deposition time of Ni(OH)2 as well as the effect of anodization of commercial graphite sheet on supercapacitive behavior of the constructed electrode was investigated and proved by surface morphology (FE-SEM), CV, GCD, and EIS electrochemical tests at 1.0 M NaOH solution. Also, XRD and EDX analyses confirmed that MWCNT and Ni(OH)2 were deposited on the electrode. To investigate the operational use of the fabricated electrode, a symmetric solid-state supercapacitor device was constructed with the optimized electrode, and its electrochemical performance was investigated. The results showed that the optimized supercapacitor device has a good capacitance of 115 mF cm−2 at 1 mA cm−2 and cyclic life of 72.18