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

Autor:	Sachidulal Biswas, Joyashish Debgupta, Achintesh Narayan Biswas, Purak Das, Suranjana Bose
Rok vydání:	2020
Předmět:	Inorganic Chemistry chemistry Electrolysis of water Catalytic oxidation Ligand Kinetics chemistry.chemical_element Electrocatalyst Electrochemistry Cobalt Faraday efficiency Nuclear chemistry
Zdroj:	Dalton Transactions. 49:7155-7165
ISSN:	1477-9234 1477-9226
DOI:	10.1039/d0dt00838a
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::074f00a310707687d274d128e13d5363 https://doi.org/10.1039/d0dt00838a Zobrazit plný text záznamu