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Pàgina inicial > Articles > Articles publicats > Upscaling high activity oxygen evolution catalysts based on CoFe2O4 nanoparticles supported on nickel foam for power-to-gas electrochemical conversion with energy efficiencies above 80% |
Data: | 2019 |
Resum: | We investigate cobalt ferrite nanoparticles (NPs) supported on large-scale electrodes as oxygen evolution reaction (OER) catalysts. Colloidal CoFeO NPs were loaded on low-cost and high surface area nickel foam (NF) scaffolds. The coating process was optimized for large electrode areas, ensuring a proper distribution of the NPs on the NF that allowed overcoming the electrical conductivity limitations of oxide NPs. We were able to produce CoFeO-coated NFs having 10 cm geometric surface areas with overpotentials below 300 mV for the OER at a current density of 50 mA/cm. Such impressively low overpotentials suggested using CoFeO NP-based electrodes within a water electrolysis device. In this prototype device, stable operating currents up to 500 mA at remarkably low cell-voltages of 1. 62 and 1. 53 V, at ambient and 50 °C electrolyte temperatures, respectively, were reached during operation periods of up to 50 h. The high electrochemical energy efficiencies reached at 50 mA/cm, 75% and 81% respectively, rendered these devices particularly appealing to be combined with low-cost photovoltaic systems for bias-free hydrogen production. Therefore, CoFeO NP-based electrolysers were coupled to low-cost thin-film silicon solar cells with 13% efficiency to complete a system that afforded solar-to-fuel efficiencies above 10%. |
Ajuts: | Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1246 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-327 Ministerio de Economía y Competitividad MAT2014-59961 Ministerio de Economía y Competitividad ENE2016-80788-C5-5-R Ministerio de Economía y Competitividad ENE2016-77798-C4-3-R Ministerio de Economía y Competitividad ENE2017-85087 Ministerio de Economía y Competitividad SEV-2017-0706 Ministerio de Economía y Competitividad FJCI-2016-29147 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-128 |
Drets: | Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió sotmesa a revisió |
Matèria: | CoFe2O4 ; Colloidal ; OER ; Solar fuels ; Prototype |
Publicat a: | Applied catalysis. B, Environmental, Vol. 259 (December 2019) , art. 118055, ISSN 0926-3373 |
Preprint 19 p, 1.3 MB |