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Typical voltammetric curves at 100% RH and 25°C over a bare mica substrate (A) or a mica substrate treated with TE buffer solution (B). Radius of curvature of the W tip is ≈10 μm. In all cases, the voltage was scanned from 0 V (the starting point) in either direction and then returned to 0 V; scan rate, 0.2 V/s.
