<![CDATA[The increasing demand for energy storage devices has encouraged the development of alternative silica-based anode materials. This study aimed to synthesize and characterize a silica/carbon (SiO₂/C) composite using geothermal waste as the silica source and coconut shell charcoal as the carbon source. Silica was synthesized using the sol-gel method, while activated carbon was prepared through carbonization at 700 °C and activation with 3 M KOH. SiO₂/C composites were synthesized by the solid-state method at SiO₂-to-carbon mass ratios of 1:4, 1:9, and 1:19, followed by calcination at 500 °C. Characterization was conducted using XRF, FTIR, XRD, SEM-EDS, and titrimetric analysis. The synthesized silica contained 93.50% SiO₂. FTIR confirmed the presence of Si–O–Si, Si–OH, and C=C groups, XRD indicated an amorphous structure, and SEM-EDS revealed irregular particle morphology. The SiO₂-to-activated carbon mass ratio influenced the composite surface area and yield, with the 1:19 ratio exhibiting the highest estimated surface area of 321.8635 m²/g and the highest yield of 96.01%.]]>
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