Coulometric Study of Acetate Adsorption at a Polycrystalline Platinum Electrode
Final rept. for period ending 7 Jul 2011
ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
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The adsorption of acetic acid from a perchloric acid electrolyte blocks the adsorption of oxygen on a polycrystalline platinum electrode. Using a staircase of potential pulses, it is possible to follow the adsorption process from the moment of surface activation and under well-defined conditions of mass transport. Under those conditions, the initial rate of blockage adheres well to that anticipated by diffusion control with each mole of acid preventing the adsorption of four equivalents of charge, validating coulombic measurement as a quantitative tool for determining the rates of adsorption, desorption, and equilibrium surface coverage.
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