When a power supply brings an electrode in an ionic solution to a potential versus a reference electrode, then the electrode surface and adjacent layer of solution store charge like two plates of a parallel plate capacitor. The inner potential drop between electrode surface and adjacent layer of solution is like the voltage between the parallel plates, V, and the capacitance C is given by
C = q/V ---------- (1)
And taking the derivative with respect to time gives the voltage/current relationship
I(t) = C dV(t)/ dt ----------- (2)
For a Pt disk (that is, the working electrode) in aqueous 0.1M KCl has its potential scanned at a scan rate (dV(t)/dt) of 50, 100, 200, 500 mV/sec (see figure). For the 500 mV/sec scan (black line) calculate
This question belongs to physics and discusses about Pt disk working electrode and to determine the differential capacitance of the Pt/solution interphase.
Total word count: 30
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