IR drop studies of poly(aniline)-based modi fi ed electrodes

Autor(es)

Oliveira, Rafaela D. ^[1] ; Santos, Cleverson S. ^[2] ; Garcia, Jarem R. ^[1] ; Vidotti, Marcio ^[3] ; Marchesi, Luis F. ^{[4, 5]} ; Pessoa, Christiana A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Ponta Grossa, Av Carlos Cavalcanti 4748, BR-84030900 Ponta Grossa, Parana - Brazil

^[2] Inst Fed Educ Ciencia & Tecnol Farroupilha, BR-97555000 Alegrete, RS - Brazil

^[3] Univ Fed Parana, Grp Pesquisas Macromol & Interfaces GPMIn, CP 19032, BR-81531980 Curitiba, Parana - Brazil

^[4] Univ Tecnol Fed Parana UTFPR, Grp Estudos Espect Impedancia Eletroquim GEIS, Rua Dr Washington Subtil Chueire 330, BR-84017220 Ponta Grossa, Parana - Brazil

^[5] Univ Fed Integracao Latinoamer, Grp Interdisciplinar Mat Avancados & Funcionais G, Parque Tecnol Itaipu 6731, POB 2044, BR-85867900 Foz Do Iguacu, PR - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ELECTROANALYTICAL CHEMISTRY; v. 878, DEC 1 2020.
• Citações Web of Science: 1

Resumo

This manuscript presents the electrochemical impedance spectroscopy study regarding the influence of the pH and the range of the applied potential on the IR drop of polyaniline - Gum arabic/graphene oxide (PANI-GA/GOx) electrodes modified by the Layer-by-Layer technique. Using the equivalent circuit modeling methodology, it was discussed the IR drop dependence on parameters such as series and charge-transfer resistances and the double-layer capacitance. Series resistance related to the (PANI-GA/GOx) film conductivity showed to be very influenced by the pH, where a lower value of pH favored the protonation of the polyaniline-based film, increasing the overall conductivity leading to lower values of IR drop. Moreover, the IR drop also showed to be dependent on the range of the applied potential, reflecting in a change at the electrode/electrolyte interface, where an increase at the charge-transfer resistance was found at higher potentials, probably due to the pernigraniline state of PANI. (AU)

• Processo FAPESP: 14/50867-3 - INCT 2014: Instituto Nacional de Ciência e Tecnologia de Bioanalítica
• Beneficiário: Marco Aurelio Zezzi Arruda
• Modalidade de apoio: Auxílio à Pesquisa - Temático