Copper-cobalt foams as active and stable catalysts for hydrogen release by hydrolysis of sodium borohydride

The progress of hydrogen generation by sodium borohydride hydrolysis depends highly on the development of efficient catalysts based on non-noble metals such as cobalt. However, such catalysts undergo extensive deactivation which has a detrimental effect on their stability. Herein, highly porous copp...

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Bibliographic Details
Published in:International journal of hydrogen energy 2016-06, Vol.41 (20), p.8438-8448
Main Authors: Eugénio, Sónia, Demirci, Umit B., Silva, Teresa Moura, Carmezim, Maria João, Montemor, Maria Fátima
Format: Article
Language:English
Subjects:
BIMETALS
Borohydrides
Catalysis
CATALYSTS
Chemical Sciences
Cobalt
COPPER ALLOYS (40 TO 99.3 CU)
COPPER COBALT ALLOYS
Copper-cobalt metallic foams
Electrodeposition
Foams
HYDRIDES
Hydrogen
Hydrolysis
Sodium
Sodium borohydride
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Summary:The progress of hydrogen generation by sodium borohydride hydrolysis depends highly on the development of efficient catalysts based on non-noble metals such as cobalt. However, such catalysts undergo extensive deactivation which has a detrimental effect on their stability. Herein, highly porous copper and cobalt-based bimetallic foams, CuxCo100−x (x = 0–100 at%), produced by electrodeposition using the dynamic hydrogen bubble template are reported. The chemical composition of the foams was optimized in order to enhance specific surface area and improve their catalytic activity and stability as heterogeneous catalysts for sodium borohydride hydrolysis. Among the tested catalysts, copper-rich samples like Cu85Co15 are slightly more active than Co100 and above all, they are less sensitive to deactivation by borates adsorption. Porous copper-rich foams were found to be an alternative to cobalt as low-cost, active and stable heterogeneous catalysts for hydrogen generation by hydrolysis of sodium borohydride. •Highly porous copper and cobalt-based bimetallic foams were produced.•They were produced by electrodeposition using the dynamic hydrogen bubble template.•Cu85Co15 is more active than Co100 in hydrolysis of NaBH4.•Cu85Co15 is above all less sensitive to deactivation by borates adsorption.•Porous copper-rich foams are alternative to cobalt for H2 generation from NaBH4.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2016.03.122