Abstract
The effect of ammonium ions on the electroreduction of peroxodisulfate (S2O2- 8) and perbromate (BrO- 4) anions is found to be commensurate with that of potassium ions. Ammonium ions accelerate the reduction of iodate (IO- 3), bromate (BrO- 3), and chromate (CrO2- 4) anions in nonbuffered solutions and does not, in buffered ones. In the former case, the effect is connected with the pH change in the near-electrode layer during the reaction and with the participation of ammonium ions in hydrolytic equilibriums, rather than with a simultaneous transfer of ammonium ions and electrons in an elementary act. The conclusions in the literature in favor of a simultaneous transfer of the proton and electron in the proton-consuming reactions of reduction of anions is shown to be ambiguous.
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Botukhova, G.N., Borzenko, M.I. & Petrii, O.A. Effect of Ammonium Ions on the Electroreduction of Anions at a Mercury Electrode. Russian Journal of Electrochemistry 40, 414–419 (2004). https://doi.org/10.1023/B:RUEL.0000023933.51203.b1
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DOI: https://doi.org/10.1023/B:RUEL.0000023933.51203.b1