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2024
ACL
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Diana M.Fernandes, Victor K.Abdelkader-Fernandez, Ali Fayad, Conchi O.Ania, Fabiano R.Praxedes, Silvania Lanfredi, Enrique Rodríguez-Castellón, Elena Rodríguez-Aguado, Juan C.Hernández-Garrido, Juan J.Quintana-González, Po S.Poon, Juan Matos, 'Ni and Co-based bifunctional electrocatalysts supported on TiO2@C for oxygen evolution and reduction reactions', Electrochim. Acta 506 145030 (2024) doi:10.1016/j.electacta.2024.145030
In the search for affordable, ecofriendly, and sustainable catalysts for energy-related processes, series of Ni and Co-based bifunctional hybrid electrocatalysts supported on TiO2@C were prepared and studied in the oxygen evolution (OER) and oxygen reduction reactions (ORR). The hybrid TiO2@C supports were prepared using three biomass precursors: furfural, chitosan and saccharose. The nature and dispersion of the metallic phases on those supports was evaluated as a function of the biomass-derived precursors. The prepared materials showed electrocatalytic activity towards ORR and OER reaction, being more active for the latter. Despite a lower performance than Pt/C benchmark, these materials are clearly at much lower costs. The long-term stability and performance of the catalysts were also performed. The number of electrons involved in both processes was determined and a mechanism is proposed for the understanding of the mechanism of reactions using the present materials. It can be concluded that the Ni and mainly Co-based electrocatalysts show a remarkable potential for use as alternative catalysts in fuel cells-related reactions.
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