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Updated: Dec 21, 2025

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Published on: October 5, 2019
Redox-active ligand assisted electrocatalytic water oxidation by a mononuclear cobalt complex
Sachidulal Biswas1, Suranjana Bose, Joyashish Debgupta
1Department of Chemistry, National Institute of Technology Sikkim, Ravangla, South Sikkim 737139, India. achintesh@nitsikkim.ac.in.
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.
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