Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 21, 2020
Previous Article Next Article

Redox-active ligand assisted electrocatalytic water oxidation by a mononuclear cobalt complex

Author affiliations

Abstract

In this report, the synthesis, characterization and electrocatalytic oxidation of water by a mononuclear cobalt(III) complex, [CoIII(dpaq)(Cl)]Cl (1) featuring a redox-active pentadentate amidate ligand (H-dpaq = 2-[bis(pyridin-2-ylmethyl)]amino-N-quinolin-8-yl-acetamidate) is reported. Complex 1 has been found to be a stable and homogeneous water oxidation catalyst (WOC) in 0.1 M phosphate buffer (pH 8.0). A series of experiments (rinse test, SEM, EDX spectroscopy) confirm that this complex acts as a molecular electrocatalyst, and not a precursor of CoOx. The electrocatalytic water oxidation proceeds with high faradaic efficiency (81%) and fast rate (85 s−1). Analysis of the electrochemical reaction kinetics by foot-of-the-wave (FOWA) methodology reveals a high turnover frequency of 1.6 × 104 s−1 which is comparable to the best performing Ru-based WOCs.

Graphical abstract: Redox-active ligand assisted electrocatalytic water oxidation by a mononuclear cobalt complex

Back to tab navigation

Supplementary files

Article information


Submitted
05 Mar 2020
Accepted
04 May 2020
First published
04 May 2020

Dalton Trans., 2020,49, 7155-7165
Article type
Paper

Redox-active ligand assisted electrocatalytic water oxidation by a mononuclear cobalt complex

S. Biswas, S. Bose, J. Debgupta, P. Das and A. N. Biswas, Dalton Trans., 2020, 49, 7155
DOI: 10.1039/D0DT00838A

Social activity

Search articles by author

Spotlight

Advertisements