Stability of supported Pd-based ethanol oxidation reaction electrocatalysts in alkaline media

Author(s)

Gentil, Tuani C. ; Minichova, Maria ; Briega-Martos, Valentin ; Pinheiro, Victor S. ; Souza, Felipe M. ; Moura, Joao Paulo C. ; Silva, Julio Cesar M. ; Batista, Bruno L. ; Santos, Mauro C. ; Cherevko, Serhiy

• Document type: Journal article
• Source: JOURNAL OF CATALYSIS; v. 440, p. 8-pg., 2024-12-01.

Abstract

This study evaluates the dissolution of the supported electrocatalysts Pd/C, PdSn/C, PdNb/C, and PdFe3O4/C during ethanol oxidation reaction for Alkaline Direct Liquid Fuel Cells (ADLFC) applications. A scanning flow cell (SFC) combined to an inductively coupled plasma mass spectrometry (online ICP-MS) is used to assess the dissolution stability in a broad potential window. Accelerated stress tests with and without ethanol are developed using a rotating disk electrode (RDE) with dissolution products analysis by ex-situ ICP-MS. Potential profiles simulating those experienced by the catalyst during regular fuel cell operation were used. Sn and Fe catalysts demonstrate improved activity and stability compared with the material with Pd alone. For these reasons, PdSn/ C and PdFe3O4/C are suitable for ADLFC applications. Severe Nb dissolution destabilizes Pd, increasing its leaching. This work demonstrates that while additional metals and oxides can improve the alcohol oxidation kinetics of Pd, these additives' dissolution stability must already be considered at the catalyst design stage. (AU)

• FAPESP's process: 20/14100-0 - Sodium niobate electrodes decorated with WO3 and CeO2 for degradation of the organophosphate pesticide acephate by advanced oxidative electrochemical processes
• Grantee: Felipe de Moura Souza
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 17/22976-0 - Development of palladium and niobium nanoelectrocatalysts for alkaline direct ethanol fuel cells
• Grantee: Felipe de Moura Souza
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• FAPESP's process: 22/15252-4 - Nanostructured electrocatalysts for application in direct alkaline-acid fuel cells of glycerol
• Grantee: Mauro Coelho dos Santos
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
• FAPESP's process: 18/18675-8 - Nanostructured electrocatalysts based on PT, PD and oxides of low cost for applications in energy and environment
• Grantee: Tuani Carla Gentil
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 17/10118-0 - Study and application of electrochemical technology for the analysis and degradation of endocrine interferents: materials, sensors, processes and scientific dissemination
• Grantee: Marcos Roberto de Vasconcelos Lanza
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 17/21846-6 - Nanostructures for environmental remediation and power generation from renewable sources
• Grantee: Mauro Coelho dos Santos
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants
• FAPESP's process: 17/26288-1 - Hybrid electrocatalysts based on Pd, Pt and Sn nanoparticles, and on ceria nanorods for application in fuel cells
• Grantee: Victor dos Santos Pinheiro
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 21/10033-0 - Online analysis of the dissolution of palladium-based electrocatalysts in alkaline medium
• Grantee: Tuani Carla Gentil
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate