Electrocatalytic reduction of protons to dihydrogen by the cobalt tetraazamacrocyclic complex [Co(N4H)Cl2]+: mechanism and benchmarking of performances‡
Literature Information
Publication Date
2021-11-22
DOI
10.1039/D1SE01267C
Impact Factor
6.367
Authors
Dongyue Sun, Matthieu Koepf, Serge Gambarelli, Jean-Marie Mouesca, Murielle Chavarot-Kerlidou, Vincent Artero
View Original
Abstract
The cobalt tetraazamacrocyclic [Co(N4H)Cl2]+ complex is becoming a popular and versatile catalyst for the electrocatalytic evolution of hydrogen, because of its stability and superior activity in aqueous conditions. We present here a benchmarking of its performances based on the thorough analysis of cyclic voltammograms recorded under various catalytic regimes in non-aqueous conditions allowing control of the proton concentration. This allowed a detailed mechanism to be proposed with quantitative determination of the rate-constants for the various protonation steps, as well as identification of the amine function of the tetraazamacrocyclic ligand to act as a proton relay during H2 evolution.
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