Abstract
Oxygen reduction reaction (ORR) was investigated using polycrystalline gold (Au (poly)) electrode modified with chemisorbed iodine (I (ads)) submonolayer (sub I (ads)) in O 2-saturated 0.1 M KOH solution. The sub I (ads) was tailored by potential-dependent partial reductive desorption of I (ads) from its full monolayer. The Au (1 1 1) facet of the Au (poly) electrode was considered to remain bared at the sub I (ads)/Au (poly) electrode. The interesting finding of the present study is that (unlike the bare Au (poly) electrode) the sub I (ads)/Au (poly) electrode exhibited a quasi-reversible two-electron reduction of O 2 in alkaline media. The probable origin of the observed quasi-reversible behavior of the ORR is discussed. Experimental investigations were performed using cyclic and steady-state voltammetric, amperometric and coulometric techniques.
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