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Electrochemical reduction of carbon dioxide with a molecular polypyridyl nickel complex

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Abstract

The synthesis and reactivity of a molecular nickel(II) complex 1 with the polypyridyl ligand framework N,N,N′,N′-tetrakis(2-pyridylmethyl)ethylenediamine (TPEN) under electrochemically reducing conditions in the presence of CO2 is reported. Cyclic voltammetry (CV), infrared spectroelectrochemistry (IR-SEC) and electrolysis experiments suggest this Ni complex is competent at mediating the two-electron reduction of CO2 to CO and H2O with phenol as an added proton donor, but is subsequently prone to rapid degradation as Ni(CO)4. This deleterious pathway was shown to be mitigated by the inclusion of the CO scavenger [Ni(TMC)]2+, although this requires stoichiometric inclusion for each catalyst turnover and does not significantly improve the observed catalytic current densities.

Graphical abstract: Electrochemical reduction of carbon dioxide with a molecular polypyridyl nickel complex

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Publication details

The article was received on 16 Jan 2018, accepted on 11 Apr 2018 and first published on 11 Apr 2018


Article type: Paper
DOI: 10.1039/C8SE00027A
Citation: Sustainable Energy Fuels, 2018, Advance Article
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    Electrochemical reduction of carbon dioxide with a molecular polypyridyl nickel complex

    L. E. Lieske, Arnold L. Rheingold and C. W. Machan, Sustainable Energy Fuels, 2018, Advance Article , DOI: 10.1039/C8SE00027A

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