Abstract
The reduction of NO3 on palladium/copper electrodes has been studied using differential electrochemical mass spectroscopy (DEMS), rotating ring-disk electrodes (RRDE) and quartz microbalance electrodes (ECQM). In acidic electrolytes the activity increases linearly with Cu coverage, in alkaline electrolytes a different dependence on coverage is observed. One monolayer of Cu gives a different selectivity from bulk copper. The adsorption of NO3 is competitive with SO4 , whereas Cl adsorption blocks the reduction. Competitive adsorption lowers both the activity and the selectivity to N2. Copper activates the first electron transfer, the role of palladium is to steer the selectivity towards N2. The trends in activity and selectivity are explained in terms of coverage of N-species.
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