4.8 Article

Electrochemistry of Acids on Platinum. Application to the Reduction of Carbon Dioxide in the Presence of Pyridinium Ion in Water

Journal

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 135, Issue 47, Pages 17671-17674

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/ja407988w

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A detailed cyclic voltammetric investigation of the reduction of moderately weak acids on platinum reveals that they are reduced in two steps: one involving the hydrated protons initially present at equilibrium and the second the reduction of the acid through its prior conversion into hydrated protons. The reduction of pyridinium ions (protonated pyridine) follows this reaction scheme as does any other acid of similar pK (e.g., acetic acid). Rather than being catalytically reduced, CO2 plays a similar role through its prior conversion to carbonic acid. No trace of methanol or formate could be detected upon preparative-scale electrolysis of CO, on the same electrode in the presence of pyridinium ions.

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