Electrochemical characterization of polypyridine iron(II) and cobalt(II) complexes for organic redox flow batteries. (8th February 2018)

• Record Type: Journal Article
• Authors: Benazzi, Elisabetta; Cristino, Vito; Caramori, Stefano; Meda, Laura; Boaretto, Rita; Bignozzi, Carlo Alberto
• Is Part Of: Polyhedron. Volume 140(2018)
• Page Start: 99
• Page End: 108
• Publication Date: 2018-02-08
• Subjects: Organic redox flow batteries -- Cobalt(II) complexes -- Iron(II) complexes -- Cyclic voltammetries -- Polypiridine -- Coordination chemistry -- Electrochemical characterization; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2017.12.001
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: The electrochemical properties of a series of polypyridine iron(II) and cobalt(II) complexes based on chelate ligands were explored with the aim of finding promising candidates for applications in high voltage organic flow cells. Abstract: The electrochemical properties of a series of complexes based on chelate ligands were explored with the aim of finding promising candidates for applications in high voltage organic flow cells. The combination of Co(II)/(I) and Fe(III)/(II) as the cathodic and the anodic couple leads to open circuit voltages close to 2 V and to limiting current of the order of 30 mA/cm 2 in 0.3 M concentration in a mixture of Ethylene and Propylene carbonates. The best solubility was found for bis-cationic complexes as triflate (OTf) salts, reaching >0.6 M at room temperature. Potentiostatic and potentiodynamic experiments point to a substantial chemical and electrochemical stability at carbon based electrodes as well.