SINTESIS DAN KARAKTERISASI NICO(HPO4) SEBAGAI KATODA PADA SUPERKAPASITOR HIBRIDA

• Main Author: Kusuma Wardani, Wulan
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/68377
• Institution: Institut Teknologi Bandung

Concerns about energy shortages caused by the depletion of fossil fuel sources and the dangers of global warming caused by pollution have prompted the need for environmentally friendly renewable energy. The high demand for environmentally friendly renewable energy causes an increase in demand for energy storage devices with advanced energy conversion capabilities. Supercapacitors as storage devices can be divided into three categories: Electric Double-Layer Capacitors (EDLC Supercapacitors), pseudosupercapacitors or faradaic supercapacitors, and hybrid supercapacitors. Bimetallic materials are attractive for enhancing the performance of supercapacitor devices. Bimetallic nickel cobalt hydrogen phosphate (NiCo(HPO4)) is one of the most promising materials due to its surface interface structure, providing easy access for electrolyte ions and ion intercalation in electrochemical applications. This study aimed to determine the effect of solvent ratio on the bimetallic structure of Nickel Cobalt Phosphate and the effect of solvent ratio on the performance of hybrid supercapacitor electrodes. In this study, nickel-cobalt hydrogen phosphate (NiCo(HPO4)) was fabricated by the solvothermal method using water and ethanol and glycerol as the surface active agent. Five sample solutions were prepared with solvent ratio variance (water and ethanol). The solvothermal process was carried out at a temperature of 120 °C for 8 hours. The precipitate obtained was centrifuged at 14,000 rpm, boiled with ethanol several times, and dried in an oven at 60 °C for 24 hours. The synthesized powder was characterized using X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Cyclic Voltammetry (CV), and Galvanostatic Charge Discharge (GCD). Using a mixture of water-ethanol produces a crystal structure of NiCo(HPO4) with a diffraction pattern (XRD) that matches JCPDS no.39-706, confirmed by FTIR testing, which is indicated by the Ni-Co-O group at a wave number of 583 cm-1. SEM tests showed that the microplates (2D) were composed of crystalline nanosheets (NiCo(HPO4)). CV and GCD measurements were performed using a 3- electrode system in an electrolyte of 2.0 M KOH. The largest specific capacitance was 707 Fg-1 which was obtained from the synthesis using an air-ethanol ratio of 1:2 at a current density of 0.5 Ag-1. A specific capacitance stability test of 5000 cycles showed a retention rate of 96.3% at a current density of 10 Ag-1.