期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 259, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118055
关键词
CoFe2O4; Colloidal; OER; Solar fuels; Prototype
资金
- Generalitat de Catalunya through the CERCA program [2017 SGR 1246, 2017 SGR 327]
- Spanish MINECO [MAT2014-59961, ENE2016-80788-05-5-R, ENE2016-77798-C4-3-R, ENE2017-85087]
- Repsol S. A.
- Severo Ochoa program from Spanish MINECO [SEV-2017-0706]
- European Regional Development Funds (ERDF, FEDER)
- MINECO through Juan de la Cierva fellowship [FJCI-2016-29147]
- Deutsche Forschungsgemeinschaft (DFG) [SPP 1613]
- Generalitat de Catalunya [2017 SGR 128]
We investigate cobalt ferrite nanoparticles (NPs) supported on large-scale electrodes as oxygen evolution reaction (OER) catalysts. Colloidal CoFe2O4 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 CoFe2O4-coated NFs having 10 cm(2) geometric surface areas with overpotentials below 300 mV for the OER at a current density of 50 mA/cm(2). Such impressively low overpotentials suggested using CoFe2O4 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 degrees C electrolyte temperatures, respectively, were reached during operation periods of up to 50 h. The high electrochemical energy efficiencies reached at 50 mA/cm(2), 75% and 81% respectively, rendered these devices particularly appealing to be combined with lowcost photovoltaic systems for bias-free hydrogen production. Therefore, CoFe2O4 NP-based electrolysers were coupled to low-cost thin-film silicon solar cells with 13% efficiency to complete a system that afforded solar-tofuel efficiencies above 10%.
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