Sn-containing electrocatalysts with a reduced amount of palladium for alkaline direct ethanol fuel cell applications

Author(s):Show less -

Pinheiro, Victor S. ^[1] ; Souza, Felipe M. ^[1] ; Gentil, Tuani C. ^[1] ; Nascimento, Aline N. ^[1] ; Bohnstedt, Paula ^[1] ; Parreira, Luanna S. ^[1] ; Paz, Edson C. ^[2] ; Hammer, Peter ^[3] ; Sairre, I, Mirela ; Batista, Bruno L. ^[4] ; Santos, Mauro C. ^[4]

Affiliation

^[1] Univ Fed ABC UFABC, Lab Eletroquim & Mat Nanoestruturados LEMN, Ctr Ciencias Nat & Humanas CCNH, Rua Santa Adelia 166, BR-09210170 Santo Andre, SP - Brazil

^[2] Inst Fed Educ Ciencia & Tecnol Maranhao IFMA, Campus Acailandia, R Projetada S-N, BR-65930000 Acailandia, MA - Brazil

^[3] Univ Estadual Paulista, Inst Quim, UNESP, BR-14800060 Araraquara, SP - Brazil

^[4] Sairre, Mirela, I, Univ Fed ABC UFABC, Lab Eletroquim & Mat Nanoestruturados LEMN, Ctr Ciencias Nat & Humanas CCNH, Rua Santa Adelia 166, BR-09210170 Santo Andre, SP - Brazil

• Document type: Journal article
• Source: RENEWABLE ENERGY; v. 158, p. 49-63, OCT 2020.
• Web of Science Citations: 8

Abstract

In this work electrocatalysts based on Pd and Sn nanoparticles supported on Vulcan XC-72 carbon black with a reduced amount of Pd were prepared. We evaluated its electrocatalytic activity for ethanol oxidation reaction (EOR) in alkaline direct ethanol fuel cells (ADEFCs). The electrocatalysts were synthesized in different Pd:Sn mass ratios (1:3,1:1, 3:1 and 1:0) on the carbon containing 20 wt % of metal. The XRD patterns of the electrocatalysts revealed an alloy formation between Pd and Sn, and the electrocatalysts with lowest amount of Pd (Pd1Sn3/Vulcan XC-72) and highest electrochemically active surface area (ECSA) presented best performance in ADEFC experiments with a maximum current density and power density of 152 mA cm-2 and 42 mW cm-2, respectively. Besides the current density three times higher for EOR than that of the pure Pd, the open circuit potential of 939 mV at an operation temperature of 80 degrees C yielded the higher carbonate production. This behavior can be attributed to the presence of oxophilic Sn species, which improve the ability to remove adsorbed CO. Oxygenated species, vacancies and defects detected in the structure of PdxSny/Vulcan XC-72 catalysts are accounted for their high activity, making them very promising for the application in ADEFC. (C) 2020 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 15/10314-8 - Nanostructures for Phenol, Ciprofloxacin and 17±-ethinylestradiol Degradation
• Grantee: Mauro Coelho dos Santos
• Support Opportunities: Regular Research Grants
• FAPESP's process: 18/26307-9 - Development of Pd and Nb electrocatalysts for application in fuel cells and degradation of organic pollutants
• Grantee: Paula Böhnstedt
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• 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: 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: 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: 17/10118-0 - 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