Abstract
Pt-Nb anodes utilized in the cathodic protection system onboard of Naval ships generate NaOCl (and eventually Cl2) that (1) limits the materials that can be used in the vicinity of the anodes and (2) has a severe impact on living organisms in the marine environment. The environmentally-friendly oxygen evolution reaction (OER) from H2O is thermodynamically more favorable due to a lower equilibrium potential [1]. However, chlorine evolution successfully competes with the OER due to faster kinetics. One of a few catalysts that demonstrates high selectivity towards the OER in the presence of chloride ions in alkaline environment (pH 12) is g-MnO2 [2]. In this presentation, we will (1) compare activities and selectivities towards the OER of electrodeposited and chemically synthesized g-MnO2 and (2) determine how pH affects selectivity in the pH range from 8 to 12.
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