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For supercapacitor electrode material, hydrous /carbon black nanocomposites were prepared by the novel incipient wetness method using a fumed silica nanoparticle. First, hydrous /fumed silica/Ketjen black (KB) was synthesized by the sol-gel-based method. After dissolving the fumed silica, the hydrous nanocomposite, which is composed of nanoparticles dispersed on the high-surface-area KB , was formed with 3D porous structure at high loading of (Ru content is ). The hydrous nanocomposite electrode exhibited a specific capacitance of with high charge utilization of (72%), which is significantly higher than reported values by other workers at similar loading of . The high capacitance and the high charge utilization were probably due to enhanced proton paths within the 3D porous structure of the nanocomposite materials.
Min et al. (Sun,) studied this question.