Preprint Article Version 1 This version is not peer-reviewed

Transport of Protons and Capacitive Properties of the Nylon/Porphyrin/Graphene Oxide Coating

Version 1 : Received: 4 September 2017 / Approved: 5 September 2017 / Online: 5 September 2017 (05:12:26 CEST)

How to cite: García-Pérez, C.A.; Menchaca-Campos, C.; García-Sánchez, M.A.; Rodríguez-Pérez, O..; Uruchurtu, J. Transport of Protons and Capacitive Properties of the Nylon/Porphyrin/Graphene Oxide Coating. Preprints 2017, 2017090015 (doi: 10.20944/preprints201709.0015.v1). García-Pérez, C.A.; Menchaca-Campos, C.; García-Sánchez, M.A.; Rodríguez-Pérez, O..; Uruchurtu, J. Transport of Protons and Capacitive Properties of the Nylon/Porphyrin/Graphene Oxide Coating. Preprints 2017, 2017090015 (doi: 10.20944/preprints201709.0015.v1).

Abstract

Electrochemical impedance (EI) measurements were performed to evaluate the nylon 66/-tetra-(para-aminophenyl) porphyrin (H2T(p-NH2)PP)/graphene oxide (GO) film coating on stainless steel and compared to the nylon/H2T(p-NH2)PP and nylon/GO film samples using 1M H2SO4 as electrolyte. The nylon/H2T(p-NH2)PP and nylon/GO composite films showed high electrochemical impedance in the order of 109 ohm-cm2 and a system controlled by mass transfer, product of a diffusion process at low frequencies with a resistance up to 5 orders of magnitude, indicating the diffusion of protons through the coating and a decrease in the metal dissolution. Otherwise, the nylon/H2T(p-NH2)PP/GO film compound evaluated show good ionic conductivity and electrochemical stability in the acid environment, acting porphyrin as a catalyst to the passage of protons through the film, reducing its electrochemical impedance up to 7 orders of magnitude with respect to the compounds nylon/H2T(p-NH2)PP and nylon/GO. Likewise, good capacitance values are also shown by modifying the concentrations of porphyrin and GO reinforcing materials. These properties are important for technological applications, such as anticorrosion coating for bipolar plates or membrane in a fuel cell type PEM, super-capacitors, etc.

Subject Areas

graphene oxide; porphyrin; nylon 66. coating, electrochemical techniques

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