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

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.

Graphene-Supported Pyrene-Modified Cobalt Corrole with Axial Triphenylphosphine for Enhanced Hydrogen Evolution in pH 0-14 Aqueous Solutions

ChemSusChem ◽  
2017 ◽  
Vol 10 (22) ◽  
pp. 4632-4641 ◽  
Author(s):  
Xialiang Li ◽  
Haitao Lei ◽  
Xiaojun Guo ◽  
Xueli Zhao ◽  
Shuping Ding ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Hydrogen Evolution

Microwave synthesis of a CoSe2/graphene–TiO2 heterostructure for improved hydrogen evolution from aqueous solutions in the presence of sacrificial agents

RSC Advances ◽  
2015 ◽  
Vol 5 (24) ◽  
pp. 18841-18849 ◽  
Author(s):  
Kefayat Ullah ◽  
Zhu Lei ◽  
Shu Ye ◽  
Asghar Ali ◽  
Won-Chun Oh
Keyword(s):  
Aqueous Solutions ◽  
Hydrogen Evolution ◽  
Microwave Synthesis ◽  
High Performance ◽  
Heterogeneous Material ◽  
Microwave Assisted ◽  
Tube Type

A heterogeneous material consisting of a tube type TiO2 was grown in the presence of a CoSe2/graphene hybrid, as a high-performance photocatalyst material, through a fast microwave-assisted technique.

Hydrogen Evolution Reaction Evaluation in Aqueous Solutions Containing CO2at Different Pressures

2017 ◽  
Vol 164 (6) ◽  
pp. C294-C299 ◽  
Author(s):  
Flávio V. V. de Sousa ◽  
Pedro R. P. Viana ◽  
Bernard Tribollet ◽  
Oswaldo E. Barcia ◽  
Oscar R. Mattos
Keyword(s):  
Aqueous Solutions ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction

Photocatalytic Properties of Layered K3H3Nb10.8O30 in the Hydrogen Evolution Reaction from Aqueous Solutions of Alcohols

2017 ◽  
Vol 53 (2) ◽  
pp. 100-105 ◽  
Author(s):  
V. V. Shvalagin ◽  
G. Ya. Grodzyuk ◽  
G. V. Korzhak ◽  
N. S. Andriushyna ◽  
S. Ya. Kuchmy ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Photocatalytic Properties
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