Electrochemistry of copper in ionic liquids with different coordinating properties

Autor(es)

Martins, Vitor L. ^[1] ; Sanchez-Ramirez, Nedher ^[1] ; Calderon, Jorge A. ^[2] ; Torresi, Roberto M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim, BR-05513970 Sao Paulo - Brazil

^[2] Univ Antioquia, Ctr Invest Innovac & Desarrollo Mat CIDEMAT, Medellin - Colombia

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF MATERIALS CHEMISTRY A; v. 1, n. 45, p. 14177-14182, 2013.
• Citações Web of Science: 9

Resumo

The electrochemical behavior of Cu was evaluated in two different ionic liquids (ILs) that had the same piperidinium-based cations but different anions with different coordinating properties: bis(trifluoromethanesulfonylimide) ({[}Tf2N]) (strong coordinating property) and tetracyanoborate ({[}B(CN)(4)]) (weak coordinating property). Cyclic voltammetry and electrochemical impedance spectroscopy showed that the electrochemical behavior of Cu depends strongly on these coordinating properties. In the strongly coordinating IL, Cu exhibits no passivation, but a passivating film is formed on the metal surface in the weakly coordinating IL. Scanning electron microscopy indicated that Cu suffered from pitting corrosion in the presence of the strongly coordinating IL. Raman spectroscopy elucidated the formation of a thin film of Cu2O in both ILs, due to the trace presence of H2O (below 70 ppm). In the {[}Tf2N]-based IL, a Cu salt forms with the IL as the potential increases, but it is not enough to passivate the metal due to the solubility of the salt in the IL. In the {[}B(CN)(4)]-based IL, even at lower potentials, a Cu{[}B(CN)(4)] layer is formed that passivates the metal. (AU)

• Processo FAPESP: 09/53199-3 - Reconhecimento molecular e armazenamento de energia: estudos fundamentais do efeito de geometria, tamanho e síntese na otimização das propriedades químicas de materiais eletroativos
• Beneficiário: Roberto Manuel Torresi
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 09/09209-4 - Eletrodeposição de metais utilizando líquidos iônicos
• Beneficiário: Vitor Leite Martins
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 10/08646-9 - Síntese e caracterização de Líquidos iônicos baseados em cátions quaternários de fosfônio
• Beneficiário: Nédher Sánches Ramírez
• Modalidade de apoio: Bolsas no Brasil - Doutorado