Electrocatalytic Hydrogen Evolution by Cobalt Complexes with a Redox Non-Innocent Polypyridine Ligand

2021 ◽  
Author(s):  
Jiale Liu ◽  
Rong-Zhen Liao ◽  
Frank W. Heinemann ◽  
Karsten Meyer ◽  
Randolph P. Thummel ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Cobalt Complexes

Cobaloxime-Based Double Complex Salts as Efficient and Versatile Catalysts for the Light-Driven Hydrogen Evolution Reaction

2020 ◽  
Author(s):  
Elisabeth Hofmeister ◽  
Jisoo Woo ◽  
Tobias Ullrich ◽  
Lydia Petermann ◽  
Kevin Hanus ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Systematic Study ◽  
Cobalt Complexes ◽  
Spectroscopic Studies ◽  
Double Complex ◽  
Double Complex Salts ◽  
Noble Metal Catalysts ◽  
Reduction Potentials ◽  
Complex Salts

Cobaloximes and their BF<sub>2</sub>-bridged analogues have emerged as promising non-noble metal catalysts for the photocatalytic hydrogen evolution reaction (HER). Herein we report the serendipitous discovery that double complex salts such as [Co(dmgh)<sub>2</sub>py<sub>2</sub>]<sup>+</sup>[Co(dmgBPh<sub>2</sub>)<sub>2</sub>Cl<sub>2</sub>]<sup>-</sup> can be obtained in good yields by treatment of commercially available [Co(dmgh)<sub>2</sub>pyCl] with triarylboranes. A systematic study on the use of such double complex salts and their single salts with simple counterions as photocatalysts revealed HER activities comparable or superior to existing cobaloxime catalysts and suggests ample opportunities for this compound class in catalyst/photosensitizer dyads and immobilized architectures. Preliminary electrochemical and spectroscopic studies indicate that one key advantage of these charged cobalt complexes is that the reduction potentials as well as the electrostatic interaction with charged photosensitizers can be tuned.

A Smorgasbord of 17 Cobalt Complexes Active for Photocatalytic Hydrogen Evolution

2018 ◽  
Vol 24 (39) ◽  
pp. 9820-9832 ◽  
Author(s):  
Ross W. Hogue ◽  
Olivier Schott ◽  
Garry S. Hanan ◽  
Sally Brooker
Keyword(s):  
Hydrogen Evolution ◽  
Cobalt Complexes ◽  
Photocatalytic Hydrogen Evolution

scholarly journals Rationalizing Photo‐Triggered Hydrogen Evolution Using Polypyridine Cobalt Complexes: Substituent Effects on Hexadentate Chelating Ligands

ChemSusChem ◽  
2021 ◽  
Author(s):  
Fiorella Lucarini ◽  
David Bongni ◽  
Philippe Schiel ◽  
Gabriele Bevini ◽  
Elisabetta Benazzi ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Substituent Effects ◽  
Cobalt Complexes ◽  
Chelating Ligands

The Dark Side of Molecular Catalysis: Diimine–Dioxime Cobalt Complexes Are Not the Actual Hydrogen Evolution Electrocatalyst in Acidic Aqueous Solutions

ACS Catalysis ◽  
2016 ◽  
Vol 6 (6) ◽  
pp. 3727-3737 ◽  
Author(s):  
Nicolas Kaeffer ◽  
Adina Morozan ◽  
Jennifer Fize ◽  
Eugenie Martinez ◽  
Laure Guetaz ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Hydrogen Evolution ◽  
Cobalt Complexes ◽  
Dark Side ◽  
Molecular Catalysis

scholarly journals Rationalizing photo‐triggered hydrogen evolution using polypyridine cobalt complexes: substituent effects on hexadentate chelating ligands

ChemSusChem ◽  
2021 ◽  
Author(s):  
Fiorella Lucarini ◽  
David Bongni ◽  
Philippe Schiel ◽  
Gabriele Bevini ◽  
Elisabetta Benazzi ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Substituent Effects ◽  
Cobalt Complexes ◽  
Chelating Ligands

Distinguishing between homogeneous and heterogeneous hydrogen-evolution catalysis with molecular cobalt complexes

2017 ◽  
Vol 53 (53) ◽  
pp. 7286-7289 ◽  
Author(s):  
David J. Sconyers ◽  
James D. Blakemore
Keyword(s):  
Hydrogen Evolution ◽  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Heterogeneous Material ◽  
Cobalt Complexes ◽  
Electrochemical Quartz Crystal Microbalance ◽  
Catalyst Stability ◽  
Access To Information ◽  
Molecular Precursors ◽  
Rapid Access

An electrochemical quartz crystal microbalance can detect formation of heterogeneous material from molecular precursors, and thus provides rapid access to information on catalyst stability.

Cobaloxime-Based Double Complex Salts as Efficient and Versatile Catalysts for the Light-Driven Hydrogen Evolution Reaction

2020 ◽  
Author(s):  
Elisabeth Hofmeister ◽  
Jisoo Woo ◽  
Tobias Ullrich ◽  
Lydia Petermann ◽  
Kevin Hanus ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Systematic Study ◽  
Cobalt Complexes ◽  
Spectroscopic Studies ◽  
Double Complex ◽  
Double Complex Salts ◽  
Noble Metal Catalysts ◽  
Reduction Potentials ◽  
Complex Salts

Cobaloximes and their BF<sub>2</sub>-bridged analogues have emerged as promising non-noble metal catalysts for the photocatalytic hydrogen evolution reaction (HER). Herein we report the serendipitous discovery that double complex salts such as [Co(dmgh)<sub>2</sub>py<sub>2</sub>]<sup>+</sup>[Co(dmgBPh<sub>2</sub>)<sub>2</sub>Cl<sub>2</sub>]<sup>-</sup> can be obtained in good yields by treatment of commercially available [Co(dmgh)<sub>2</sub>pyCl] with triarylboranes. A systematic study on the use of such double complex salts and their single salts with simple counterions as photocatalysts revealed HER activities comparable or superior to existing cobaloxime catalysts and suggests ample opportunities for this compound class in catalyst/photosensitizer dyads and immobilized architectures. Preliminary electrochemical and spectroscopic studies indicate that one key advantage of these charged cobalt complexes is that the reduction potentials as well as the electrostatic interaction with charged photosensitizers can be tuned.

scholarly journals Novel homogeneous selective electrocatalysts for CO2 reduction: an electrochemical and computational study of cyclopentadienyl-phenylendiamino-cobalt complexes

2020 ◽  
Vol 4 (11) ◽  
pp. 5609-5617
Author(s):  
Nicola Melis ◽  
Francesca Mocci ◽  
Annalisa Vacca ◽  
Luca Pilia
Keyword(s):  
Hydrogen Evolution ◽  
Computational Study ◽  
Co2 Reduction ◽  
Cobalt Complexes ◽  
Catalytic Current

Cobalt cyclopentadienyl phenylendiamine complexes are revealed to be efficient and selective electrocatalysts for CO2 reduction, resulting in a 31-fold catalytic current without the hydrogen evolution.

scholarly journals Dinuclear Cobalt Complexes with a Decadentate Ligand Scaffold: Hydrogen Evolution and Oxygen Reduction Catalysis

2015 ◽  
Vol 22 (1) ◽  
pp. 361-369 ◽  
Author(s):  
Carlo Di Giovanni ◽  
Carolina Gimbert-Suriñach ◽  
Michael Nippe ◽  
Jordi Benet-Buchholz ◽  
Jeffrey R. Long ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Hydrogen Evolution ◽  
Cobalt Complexes
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