Nickel-cobaltite Spinel Catalysts for Bifunctional Oxygen Electrodes
| Autor: | V. Baglio, C. Busacca, A. Di Blasi, O. Di Blasi, E. Modica, M. Girolamo, A.S. Aricò, V. Antonucci, C. Alegre |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | 2nd Congress of the Interdivisional Group on Chemistry for Renewable Energy of the Italian Chemical Society-SCI (ENERCHEM 2), Padova (Italia), 12-14/02/2020 info:cnr-pdr/source/autori:V. Baglio, C. Busacca, A. Di Blasi, O. Di Blasi, E. Modica, M. Girolamo, A.S. Aricò, V. Antonucci, C. Alegre/congresso_nome:2nd Congress of the Interdivisional Group on Chemistry for Renewable Energy of the Italian Chemical Society-SCI (ENERCHEM 2)/congresso_luogo:Padova (Italia)/congresso_data:12-14%2F02%2F2020/anno:2020/pagina_da:/pagina_a:/intervallo_pagine |
| Popis: | Rechargeable alkaline metal-air batteries can be considered one of the most promising next energy storage systems owing to their extremely high energy densities. However, this kind of batteries requires very efficient and durable bifunctional electrocatalysts to accelerate the kinetics of oxygen reduction reaction (ORR), taking place during the discharge, and oxygen evolution reaction (OER), occurring during charging of the battery. In the last few years, research was focused on the development of highly efficient oxygen reduction/evolution catalysts based on transition metals, such as Co, Fe, Mn, La, etc, in the form of mixed oxides (perovskites, spinels, etc.), or advanced carbon materials. Co-based catalysts have been thoroughly investigated for the ORR/OER, and, usually, Co3O4 is the most employed formulation. However, the electrical conductivity of bare Co3O4 is not appropriate for the application in most of these devices. Ni and other transition metals can partially replace Co atoms in the Co3O4 spinel structure, improving its electronic conductivity while promoting oxygen evolution. Another approach is to combine these oxides with carbon nanostructures, in particular graphitic ones, in order to maintain suitable stability under cycling operation. Recently, carbon nanofibers (CNF) synthesized by electrospinning, modified with a combination of cobalt oxide and metallic cobalt (CoO-Co/CNF)1 or loaded with nickel and cobalt (both in the metallic and oxide forms)2, were investigated in our laboratories as bifunctional air electrodes showing good reversibility and stability. In the present work, the latter catalyst (NiCo-loaded CNFs 2), after the electrospinning preparation, has been oxidized with the aim of synthesizing the pure spinel structure (NiCo2O4) supported on CNFs. The electrochemical behavior of the spinel has been compared with the previously developed catalyst to elucidate the catalytic activity of the two systems for ORR and OER in relation with their physico-chemical properties. References 1. Alegre, C.; Busacca, C.; Di Blasi, O.; Antonucci, V.; Arico, A. S.; Di Blasi, A.; Baglio, V. Journal of Power Sources 2017, 364, 101-109. 2. Alegre, C.; Modica, E.; Di Blasi, A.; Di Blasi, O.; Busacca, C.; Ferraro, M.; Antonucci, V.; Arico, A. S.; Baglio, V. Renewable Energy 2018, 125, 250-259. |
| Databáze: | OpenAIRE |
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