A Molecular Cobalt Hydrogen Evolution Catalyst Showing High Activity and Outstanding Tolerance to CO and O 2

There is a demand to develop molecular catalysts promoting the hydrogen evolution reaction (HER) with a high catalytic rate and a high tolerance to various inhibitors, such as CO and O . Herein we report a cobalt catalyst with a penta-dentate macrocyclic ligand (1-Co), which exhibits a fast catalyti...

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Published inAngewandte Chemie International Edition Vol. 58; no. 32; pp. 10923 - 10927
Main Authors Wang, Jia-Wei, Yamauchi, Kosei, Huang, Hai-Hua, Sun, Jia-Kai, Luo, Zhi-Mei, Zhong, Di-Chang, Lu, Tong-Bu, Sakai, Ken
Format Journal Article
LanguageEnglish
Published Germany 05.08.2019
Subjects
CO tolerance
cobalt complexes
homogeneous catalysis
air tolerance
hydrogen evolution reaction
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Summary:There is a demand to develop molecular catalysts promoting the hydrogen evolution reaction (HER) with a high catalytic rate and a high tolerance to various inhibitors, such as CO and O . Herein we report a cobalt catalyst with a penta-dentate macrocyclic ligand (1-Co), which exhibits a fast catalytic rate (TOF=2210 s ) in aqueous pH 7.0 phosphate buffer solution, in which proton transfer from a dihydrogen phosphate anion (H PO ) plays a key role in catalytic enhancement. The electrocatalyst exhibits a high tolerance to inhibitors, displaying over 90 % retention of its activity under either CO or air atmosphere. Its high tolerance to CO is concluded to arise from the kinetically labile character of undesirable CO-bound species due to the geometrical frustration posed by the ligand, which prevents an ideal trigonal bipyramid being established.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201904578