ANALISIS PENGARUH PENAMBAHAN GRAPHENE OXIDE (GO) PADA SOLID POLYMER ELEKTROLITE (SPE) BERBASIS POLYVINYL ALCOHOL (PVA) DAN NATRIUM SULFIT (Na2SO3) TERHADAP STRUKTUR KRISTAL, GUGUS FUNGSI & KONDUKTIVITAS IONIK

Abstract

This study aims to examine the effect of adding graphene oxide (GO) on the characteristics of polyvinyl alcohol (PVA)-based solid polymer electrolyte (SPE) with the addition of 15% sodium sulfite (Na₂SO₃) salt. Sample preparation was carried out via solution casting with varying GO concentrations of 0.75%, 1.00%, and 1.25%. Characterization testing was performed using X-ray diffraction (XRD) to determine changes in crystal structure, Fourier transform infrared (FTIR) to identify changes in functional groups, and electrochemical impedance spectroscopy (EIS) to measure ionic conductivity. The XRD test results showed an increase in the Full Width at Half Maximum (FWHM) value with the addition of GO, indicating a decrease in crystallinity and an increasingly amorphous sample. The FTIR test confirmed the interaction between the functional groups of PVA, Na₂SO₃, and GO through the formation of hydrogen bonds and ionic interactions. EIS testing showed the highest conductivity value at a GO addition of 1.25%, with an ionic conductivity value of 6.251 × 10-5, indicating a better value compared to without GO addition. The addition of GO was proven to improve microstructure, reduce crystallinity, and enhance ionic conductivity performance in PVA and Na₂SO₃-based SPE materials.