Appropriate morphology of Co₃O₄ nanofiller in PVA/KOH electrolyte and application in supercapacitor = Appropriate morphology of Co₃O₄ nanofiller in PVA/KOH electrolyte and application in supercapacitor

다국어 초록 (Multilingual Abstract)

Metal oxides are incorporated as nanofillers (NFs) in the polymer electrolytes to reduce the polymer crystallinity and enhance ion conductivity. In this study, we prepare two types of Co₃O₄ to serve as NF in polyvinyl alcohol electrolytes. One-dimensional Co₃O₄ (1-DCO) is synthesized by chemical bath deposition and via oxidation of ZIF-67, polyhedral Co₃O₄ (PCO) is prepared . The conductivity is measured by using 1-DCO and PCO as additives in PVA/KOH electrolyte. The optimized mass percentage was 7 wt% determined by ionic conductivity measurements using two steel blocking electrodes. Furthermore, the electrochemical properties of two electrode supercapacitors were evaluated by cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. As a result, the gel electrolyte containing one-dimensional Co₃O₄ filler was considered more suitable for supercapacitor due to provide long electron pathway and ion transfer tunnels.