Sustainable Synthesis of CoFe2O4/Fe2O3 Catalyst for Hydrogen Generation from Sodium Borohydride Hydrolysis
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catalysts-15-00943.pdf
Description
Published version
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6.71 MB
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e92106e794c18c236d8ce7062baba35b
Author(s)
Teixeira, Lucas Tonetti
Medeiros, Marcos
Liu, Liying
Park, Vinicius Novaes
Valente-Rodriguez, Célio
Letichevsky, Sonia
Fajardo, Humberto Vieira
de Siqueira, Rogério Navarro Correia
Maia da Costa, Marcelo Eduardo Huguenin
Botelho Junior, Amilton Barbosa
Date Issued
October 1, 2025
Journal
Catalysts
Publisher
Multidisciplinary Digital Publishing Institute
Citation
Teixeira, L. T., Medeiros, M., Liu, L., Park, V. N., Valente-Rodriguez, C., Letichevsky, S., Fajardo, H. V., de Siqueira, R. N. C., Maia da Costa, M. E. H., & Botelho Junior, A. B. (2025). Sustainable Synthesis of CoFe2O4/Fe2O3 Catalyst for Hydrogen Generation from Sodium Borohydride Hydrolysis. Catalysts, 15(10), 943.
Version
Final published version
Abstract
Hydrogen has been explored as a greener alternative for greenhouse gas emissions reduction. Sodium borohydride (NaBH4) is a favorable hydrogen carrier due to its high hydrogen content, safe handling, and rapid hydrogen release. This work presents a novel synthesis of the catalyst CoFe2O4/Fe2O3 using nanocellulose fibers (TCNF) as reactive templates for metal adsorption and subsequent calcination. The resulting material was tested for H2 production from basic NaBH4 aqueous solutions (10–55 °C). The catalyst’s composition is 74.8 wt% CoFe2O4, 25 wt% Fe2O3, and 0.2 wt% Fe2(SO4)3 with agglomerated spheroidal particles (15–20 nm) and homogeneous Fe and Co distribution. The catalyst produced 1785 mL of H2 in 15 min at 25 °C (50 mg catalyst, 4.0% NaBH4, and 2.5 wt% NaOH), close to the stoichiometric maximum (2086 mL). The maximum H2 generation rate (HGR) reached 3.55 L min−1 gcat−1 at 40 °C. Activation energies were determined using empirical (38.4 ± 5.3 kJ mol−1) and Langmuir–Hinshelwood (L–H) models (42.2 ± 5.8 kJ mol−1), consistent with values for other Co-ferrite catalysts. Kinetic data fitted better to the L–H model, suggesting that boron complex adsorption precedes H2 evolution.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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DOI of Published Version
https://doi.org/10.3390/catal15100943
