Kaique Soares Souza, Juliana Midori Toia Katayama Sasso, Jocely de Lucena Dutra, Andreza Miranda Barata da Silva, Joel dos Santos Batista, Maria Aparecida Viana Pinheiro, Francisco Martins de Oliveira Neto, Edward Ralph Dockal, Fernando Armani Aguiar, Eduardo Guilherme Cividini Neiva, Elson Almeida Souza, José Wilmo da Cruz Júnior, Paulo José Sousa Maia
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Abstract
This study explored the potential for performance enhancement using a Ru(III) salophen-type Schiff base complex as a co-catalyst in conjunction with PtSn/C for ethanol electro-oxidation. This type of compound is recognized as a cost-effective synthetic catalyst for oxidation reactions, which can improve the electrocatalytic activity of platinum-based catalysts while remaining less expensive. The ligand and complex were synthesized and characterized using various techniques, including FTIR and UV–vis spectroscopies, thermogravimetric analysis, X-ray diffraction, scanning electron microscopy, and energy-dispersive spectroscopy. Electrocatalytic experiments revealed that the mixed catalyst PtSn/C:[Ru(ndsp)(Cl)(H₂O)] at a mass ratio of 4:1—comprising 20% of the catalyst mass—outperformed pure PtSn/C. It achieved a peak current density of 32.5 mA/cm2, approximately 1.7 times higher than that of pure PtSn/C, and the onset potential for the ethanol oxidation reaction occurred at a less positive value. Maximum catalytic efficiency was observed at a pH of 0.3 and increased with higher ethanol concentrations. These results indicate that the addition of the Ru(III) complex significantly enhances the catalytic activity of PtSn/C, making it a promising and cost-effective candidate catalyst system for direct ethanol fuel cell (DEFC) applications.
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Electrocatalysis is cross-disciplinary in nature, and attracts the interest of chemists, physicists, biochemists, surface and materials scientists, and engineers. Electrocatalysis provides the unique international forum solely dedicated to the exchange of novel ideas in electrocatalysis for academic, government, and industrial researchers. Quick publication of new results, concepts, and inventions made involving Electrocatalysis stimulates scientific discoveries and breakthroughs, promotes the scientific and engineering concepts that are critical to the development of novel electrochemical technologies.
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