Abstract
The effect of halide adsorption on the rate of hydrogen peroxide decomposition in alkaline solution has been studied. The reduction of oxygen at clean silver in acidic, alkaline, and unbuffered electrolytes has also been investigated for comparison. On prereduced electrodes the amount of hydrogen peroxide observed during the reduction of oxygen is related to pH and adventitious contamination. Specific adsorption by halides decreases the efficiency of the “four-electron” reduction of oxygen with concomitant formation of hydrogen peroxide. With iodide, the reduction of oxygen to hydrogen peroxide is nearly 100% efficient. Coverages of Iads approaching 0.2 monolayer are sufficient to create an energy barrier for breaking of the oxygen-oxygen bond and effectively poison the catalytic surface of silver.
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