Polymeric binuclear ruthenium complex as efficient electrocatalyst for oxygen evolution reaction

Author(s)

Matias, Tiago A. ^[1] ; Parussulo, Andre L. A. ^[1] ; Benavides, Paola A. ^[1] ; Guimaraes, Robson R. ^[1] ; Dourado, Andre H. B. ^[1] ; Nakamura, Marcelo ^[1] ; Cordoba de Torresi, Susana I. ^[1] ; Bertotti, Mauro ^[1] ; Araki, Koiti ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Chem, Dept Fundamental Chem, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: Electrochimica Acta; v. 283, p. 18-26, SEP 1 2018.
• Web of Science Citations: 6

Abstract

A robust polymeric material constituted by chains of binuclear aqua ruthenium terpyridylphenanthroline complexes connected through benzene ring meta-positions, exhibiting an unusual two electrons and two protons PCET (proton-coupled electron transfer) process and enhanced oxygen evolution reaction (OER) activity, is described. The catalytic active {[}Ru-V=O] species is generated at potentials more positive than + 1.5 V (NHE) in the poly-{[}[Ru(H2O)(phen)](2)(tpy(2)ph)] film, as confirmed by the rise of the ruthenyl (Ru-V=O) stretching band at 810 cm(-1) in the Raman spectrum, and the clear change to a higher activity regime as confirmed by EIS. Faradaic efficiency for OER as high as 39% was achieved at +1.8 V, indicating that poly-{[}[Ru(H2O)(phen)](2)(tpy(2)ph)] is one of the most active ruthenium terpyridine complexes ever prepared. The synthesis and characterization of the monomeric binuclear {[}[RuCl(Clphen)](2)(tpy(2)ph)](2+) and its respective {[}[Ru(H2O)(Clphen)](2)(tpy(2)ph)](4+) aqua complex are also fully described. (C) 2018 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 13/24725-4 - Supramolecular chemistry and nanotechnology
• Grantee: Henrique Eisi Toma
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 13/25592-8 - Study of L-cysteine and L-cystine adsorption on platinum electrodes
• Grantee: André Henrique Baraldi Dourado
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 15/26308-7 - Optimization of the physicochemical properties of nano -structured materials for applications in molecular recognition, catalysis and energy conversion/storage
• Grantee: Roberto Manuel Torresi
• Support Opportunities: Research Projects - Thematic Grants