Electrocatalysts based on low amounts of palladium combined with tin nanoparticles and cerium dioxide nanorods for application as ADEFC anodes

Author(s)

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

Affiliation

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

^[2] Univ Estadual Paulista, UNESP, Inst Quim, BR-14800060 Araraquara, SP - Brazil

• Document type: Journal article
• Source: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY; v. 46, n. 79, p. 39438-39456, NOV 16 2021.
• Web of Science Citations: 0

Abstract

This study demonstrates the structural properties and evaluates the electrocatalytic activity of an ethanol oxidation reaction using ternary materials composed by Pd and Sn nanoparticles combined with CeO2 nanorods (NR) anchored on Vulcan carbon black to be used as an anode in alkaline direct ethanol fuel cells (ADEFCs). The highest open circuit voltage (1010 mV), maximum power (30 mW cm(-2)) and current densities (113 mA cm(-2)) were achieved using (Pd1Sn3)(10)(CeO2NR)(20)(Vn)(70), while the commercial anode values were 968 mV, 23 mW cm(-2) and 123 mA cm(-2). Although similar performance for both anodes was observed, the ternary hybrid electrocatalyst contains an 8-fold lower Pd content than the commercial material. This outcome may be justified by the higher defect density presented by the carbon support observed by Raman spectroscopy and the metal oxidation state modifications detected by X-ray photoelectron spectroscopy, as well as the electrochemically active surface area presented by the ternary electrocatalyst. The combination of higher vacancies, defects and oxygenated species in the carbon support and the synergistic effect between the oxyphilic Sn and CeO2 NR species and the Pd nanoparticles results in an electrochemical performance that makes these ternary electrocatalysts promising anode materials for ADEFC applications. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. (AU)

• 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
• 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: 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: 15/10314-8 - Nanostructures for Phenol, Ciprofloxacin and 17±-ethinylestradiol Degradation
• Grantee: Mauro Coelho dos Santos
• Support Opportunities: Regular Research 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: 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)