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/cm2 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.

Electrochemical characterization of polypyridine iron(II) and cobalt(II) complexes for organic redox flow batteries

Elisabetta Benazzi
Primo
;
Vito Cristino
Secondo
;
Stefano Caramori
;
Rita Boaretto
Penultimo
;
Carlo Alberto Bignozzi
Ultimo
2018

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/cm2 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.
Benazzi, Elisabetta; Cristino, Vito; Caramori, Stefano; Meda, Laura; Boaretto, Rita; Bignozzi, Carlo Alberto
File in questo prodotto:
File Dimensione Formato  
pub paper.pdf

solo gestori archivio

Descrizione: Full text editoriale
Tipologia: Full text (versione editoriale)
Licenza: NON PUBBLICO - Accesso privato/ristretto
Dimensione 1.04 MB
Formato Adobe PDF
1.04 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
benazzi2017.pdf

accesso aperto

Descrizione: Post print
Tipologia: Post-print
Licenza: Creative commons
Dimensione 1.37 MB
Formato Adobe PDF
1.37 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2384898
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 8
  • ???jsp.display-item.citation.isi??? 7
social impact