Graphitic carbon/porous silicon composite electrode for electric double-layer capacitor
Carbon/porous silicon (C/PSi) composite film was successfully synthesized by thermal degradation of an acid-catalyzed furfuryl alcohol into mesoporous silicon template. The as-prepared PSi and C/PSi are investigated as an effective anode material for electric double-layer capacitor. PSi film is prepared via electrochemical anodization of highly-doped (p+) silicon. The capacitive current of C/PSi is ~1.5X that of PSi. In addition, the obtained gravimetric capacitances of PSi and C/PSi are 207.90 F kg-1 and 843.35 F kg-1, respectively. Enhanced electrochemical properties such as high specific capacitance and electrode-electrolyte stability are owed to the easily-controlled morphology of PSi template and high surface area of carbon. The results implied that the use of PSi as porous template for carbon infiltration yields a highly stable electrode for electric double-layer capacitors.