Pd, Ag and Bi carbon-supported electrocatalysts as electrochemical multifunctional materials for ethanol oxidation and dopamine determination

Author(s)

Orzari, Luiz Otavio ; Assumpc, Monica Helena Marcon Teixeira ; Nandenha, Julio ; Neto, Almir Oliveira ; Junior, Luiz Humberto Marcolino ; Bergamini, Marcio ; Janegitz, Bruno Campos

• Document type: Journal article
• Source: Electrochimica Acta; v. 428, p. 13-pg., 2022-08-03.

Abstract

This manuscript describes the investigation towards the multifunctional synthesis, characterization, and application of different Pd, Ag and Bi-carbon black supported electrocatalysts in two different fields in electro-chemistry: fuel cells and electrochemical sensors. Throughout morphological and electrochemical characterizations, comprising scanning and transmission electron microscopies, X-ray powder diffraction, electrochemical impedance spectroscopy, and cyclic voltammetry techniques, the materials were characterized to better understand their properties towards proposed applications. Afterward, the materials were employed for ethanol oxidation in alkaline media, with investigations by chronoamperometry, cyclic voltammetry, and by closing a direct alkaline fuel cell, which the Pd50Ag45Bi05/C composite presented attractive ethanol catalysis behavior, with a maximum power density of 19.70 mW cm(-2), at 30.59 mA cm(-2). Also, the proposed device was applied for dopamine determination by square wave voltammetry. In this sense, two linear behaviors, respectively ranging from 0.2 to 1.0 and 4.0 to 40 mu mol L-1 were obtained, due to two distinctive mechanisms. This higher activity has been attributed to the synergism among the used metals and proportions contributing to the bifunctional and electronic effects. As synthetic samples investigations were accomplished, data reinforces the proposed material as a possible interfacing composite in electrochemistry. (AU)

• FAPESP's process: 17/21097-3 - Bee-agriculture interactions: perspectives to sustainable use
• Grantee: Osmar Malaspina
• Support Opportunities: BIOTA-FAPESP Program - Thematic Grants
• FAPESP's process: 19/23342-0 - Development of novel immunosensor architechtures for the detection of Huntington and Parkinson Diseases biomarkers
• Grantee: Luiz Otávio Orzari
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)