Support Information
نویسندگان
چکیده
Gold electrodes disks (2.0 mm diameter, Metrohm) were mechanically polished with aluminum oxide pads or diamond spray on polishing cloth (Kemet) of progressively decreasing particle size: 1 μm, 0.3 μm and 0.05 μm, with intermittent sonication in water. The electrodes were then electrochemically polished in a deaerated NaOH or KOH 0.5 mol L between the potentials -1.5 V and -0.5 V vs. Ag|AgCl or Ag wire at a scan rate of 100 mV s and then in deaerated 0.5 M H2SO4 between -0.2 V and 1.5 V at 100 mV s -1 until stabilization of the gold reduction peak (around 50 cycles). Electroactive areas were evaluated by integration of the cathodic peak from gold electropolishing voltammograms and converted to the real surface area using a conversion factor of 400 μC cm. These determinations of area 0.033-0036 cm and the thickness (estimated herein as 0.80-085 nm) were used in the normalization of absolute recorded capacitance per area.
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