Ultrahigh figure-of-merit for hydrogen generation from sodium borohydride using ternary metal catalysts |
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Authors: | Lunghao Hu R. CeccatoR. Raj |
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Affiliation: | a Department of Materials Engineering and Industrial Technologies, University of Trento, Via Mesiano 77, 38050, Italy b Department of Mechanical Engineering, University of Colorado, Boulder, CO 80309-0427, USA |
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Abstract: | We report further increase in the figure-of-merit (FOM) for hydrogen generation from NaBH4 than reported in an earlier paper [1], where a sub-nanometer layer of metal catalysts are deposited on carbon nanotube paper (CNT paper) that has been functionalized with polymer-derived silicon carbonitride (SiCN) ceramic film. Ternary, Ru-Pd-Pt, instead of the binary Pd-Pt catalyst used earlier, together with a thinner CNT paper is shown to increase the figure-of-merit by up to a factor of six, putting is above any other known catalyst for hydrogen generation from NaBH4. The catalysts are prepared by first impregnating the functionalized CNT-paper with solutions of the metal salts, followed by reduction in a sodium borohydride solution. The reaction mechanism and the catalyst efficiency are described in terms of an electric charge transfer, whereby the negative charge on the BH4− ion is exchanged with hydrogen via the electronically conducting SiCN/CNT substrate [1]. |
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Keywords: | Ternary catalyst Carbon nanotube support Sodium borohydride Hydrogen generation Silicon carbonitride Polymer-derived-ceramics |
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