Congratulations to Juan Angel De Gracia Triviño and Mårten S. G. Ahquist! Oxide Relay: An Efficient Mechanism for Catalytic Water Oxidation at Hydrophobic Electrode Surfaces …
Congratulations to Ebrahim Tayyebi, Javed Hussain and Egill Skúlason on their newly published article in Chemical Science! Why do RuO2 electrodes catalyze electrochemical CO2 reduction …
Time to celebrate!
The progress report for 2019 and the midterm evaluation of NordCO2 has been approved by NordForsk, and the consortium will be funded un til 2023. Congratulations to all NordCO2 members!
We are looking forward to do (and publish) more amazing CO2 science, and would like to thank NordForsk for allowing us to do so 🙂
More about NordForsk at:
Congratulations to Martin B. Johansen, Oliver R. Gedde, Thea S. Mayer and Troels Skrydstrup on their newly published article! Access to Aryl and Heteroaryl Trifluoromethyl Ketones from Aryl Bromides …
Congratulations to the Leif Hammarström research group at Uppsala University on their ercently accepted manuscript!
From non-innocent to guilty: on the role of redox-active ligand in the electro-assisted reduction of CO2 mediated by a cobalt(II)-polypyridyl complex
N. Queyriaux, K. Abel, J. Fize, J. Pécaut, M. Orio and L. Hammarström
Sustainable Energy & Fuels (2020) accepted 11/5 2020
Abstract
The electrochemical behavior of [Co(bapbpy)Cl]+ [1-Cl]+, a pentacoordinated polypyridyl cobalt(II) complex containing a redox-active pseudo-macrocyclic ligand (bapbpy: 6,6’-bis-(2-aminopyridyl)-2,2’-bipyridine) has been investigated in DMF. Cyclic voltammograms (CV), recorded in the presence of increasing amounts of chloride anions, highlighted the existence of an equilibrium with the neutral hexacoordinated complex. Under a CO2 atmosphere, CVs of [Co(bapbpy)Cl]+ exhibit significant current enhancement assigned to CO2 catalytic reduction. Controlled-potential electrolysis experiments confirmed formation of CO and HCOOH as the only identifiable products. The addition of water or chloride ions was shown to affect the distribution of the products obtained, as well as the faradaic efficiency associated with their electrocatalytic generation. A combination of electrochemical techniques, chemical reductions, spectroscopic measurements (UV-Vis and IR) and quantum chemical calculations suggests that the ability of the bapbpy ligand to be reduced at moderately negative potentials drastically limits the catalytic performances of [1-Cl]+, by stabilizing the formation of a catalytically-competent CO2-adduct that only slowly reacts with oxide acceptors to evolve towards the desired reduction products.
