Electrooxidation of organic substances on platinum modified with oxotungstate adlayersстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The behavior of a platinized platinum electrode (roughness factor ∼500) in 0.5 M H2SO4 containing Na3PW 12O40 (PW12) is studied by cyclic voltammetry. It is established that the effect of the PW12 additive on the adsorption of hydrogen and oxygen is similar to the influence exerted by specifically adsorbed anions: a predominant displacement of strongly-bound hydrogen and a heavy suppression of oxygen adsorption are observed. It is shown that the regularities of oxidation of methanol, ethylene glycol, and formic acid at platinized platinum undergoe substantial alteration in the presence of PW12. In the region of potentials Er = 0.6-0.8 V, where the limiting stage of these processes is the adsorption of organic molecules, the oxidation rates substantially decrease. The run of steady-state polarization curves in the region Er = 0.40-0.55 V depends on the direction of potential change and the extreme value of Er With E r varied from 0.6-0.8 V in the direction of lower values in the interval Er < 0.45-0.50 V, the oxidation processes accelerate as compared with the rates in the absence of PW12. The acceleration occurs if conditions are created for a preliminary adsorption of the tungstate.