Abstract
A systematic investigation of the mechanistic and electrocatalytic properties of the chlorine evolution reaction, ClER, on mixed rutile/spinel oxides of nominal composition Ti/[RuO2(x)+Co3O4(1-x)] was done. Electrodes were prepared using the thermal decomposition procedure (Tcalc. = 470oC; tcalc. = 1h), with x varied between 0 and 1, changed in 0.1 steps. Kinetics were studied recording quasi-stationary current-potential curves and reaction order determined with respect to H+ and Cl-. A constant Tafel slope of about 33 mV was found for the 0 - 80 mol% RuO2 concentration interval, increasing to 40 mV for higher RuO2 contents. Experimental data support the mechanism originally proposed by Erenburg et al. for the ClER. The edge effect exerts an influence on the electronic transfer coefficient values. Analysis of the electrocatalytic activity reveals an increase in the apparent electrocatalytic activity for the mixed oxides.
Highlights
Investigations of the chlorine evolution reaction, ClER, reveal this reaction is an “easy” one characterised by a close to theoretical Tafel coefficient (3040 mV).[1,2,3,4] Normally the ClER does not show a significant dependence on the nature of the electrode material.[1]
Electrode selectivity for the ClER remains a problem of technological interest
We report the results of a detailed investigation of the kinetics and electrocatalytic properties of the Ti/[RuO +Co O ] system for the ClER
Summary
Investigations of the chlorine evolution reaction, ClER, reveal this reaction is an “easy” one (low overpotential) characterised by a close to theoretical Tafel coefficient (3040 mV).[1,2,3,4] Normally the ClER does not show a significant dependence on the nature of the electrode material.[1]. In agreement with previous results obtained in sulfuric acid solution[20] the absence of the intense cathodic current in the j/E profiles (see Figure 1B) of the mixed rutile/spinel oxides supports the introduction of RuO stabilizes the coatings in slightly acidified chloride medium.
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