Comparative Study on Two Calculation Methods of Gold Electrode Area
In this article we electrodeposited nanogold on a bare gold surface to obtain a series of nanogold modified electrodes by changing the electrodeposition time(t).The electrode area(AD and AO)and roughness factor(Rf(D)and Rf(O))were calculated based on the Randles-Sevcik method and oxygen reduction method respectively,and the relationship between the two methods was explored.Results indicated that the electrode area increased linearly with the increase of t.Compared with the Randles-Sevcik method,the electrode area and roughness factor obtained by the oxygen reduction method increased more rapidly with t.The linear slope of Af and Rf(O)-t was seven times that of AD and Rf(D)-t.Therefore,the area calculated by the oxygen reduction method could better reflect the real electrode roughness.When Rf(O)was smaller,Rf(D)/Rf(O)approached 1,and the roughness factors obtained by the two methods were close;As Rf(O)increased,Rf(D)/Rf(O)gradually decreased;When Rf(O)was bigger than 5,Rf(D)/Rf(O)remained basically unchanged around 0.25.These conclusions provided guidance for the calculation and application of gold electrode area.
Gold electrodeElectrodepositionCalculation of electrode areaRoughness factor
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