Synthesis of solid-state NaBH4/Co-based catalyst composite for hydrogen storage through a high-energy ball-milling process |
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| Authors: | Cheng-Hong Liu Yi-Chia Kuo Bing-Hung Chen Chan-Li Hsueh Kuo-Jen Hwang Jie-Ren Ku Fanghei Tsau Ming-Shan Jeng |
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| Affiliation: | 1. Department of Chemical Engineering, National Cheng Kung University, Tainan 70101, Taiwan;2. Energy and Opto-Electronic Materials Research Center, Department of Chemical and Materials Engineering, Tamkang University, Tamsui, Taipei County 25137, Taiwan;3. New Energy Technology Division, Energy and Environment Research Laboratories, Industrial Technology Research Institute (ITRI), Hsinchu 31040, Taiwan |
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| Abstract: | Solid-state composites of NaBH4 and Co-based catalyst have been fabricated for hydrogen generation via a novel mechanochemical technique, i.e. the high-energy ball milling, in which the gravimetric storage capacity of hydrogen has reached 6.7 wt%, meeting the 2010 target of at least 0.06 kg H2/kg set by the U.S. Department of Energy (DOE). The active catalysts used in the hydrolysis reaction of sodium borohydride for hydrogen generation are mainly cobalt oxides. Controlled addition of water, namely water used as a limiting agent, to the solid composites of NaBH4 and Co-based catalyst greatly improves the H2 storage capacity and resolved the issues of low gravimetric H2 storage in conventional aqueous system of sodium borohydride. Factors influencing the performance of hydrogen production such as amounts of H2O added, catalyst loadings and durations of ball-milling processes are investigated. Moreover the hydrolyzed products of NaBH4 and spent catalysts are analyzed as well. |
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| Keywords: | Solid-state Hydrogen generation Ball milling Sodium borohydride Catalyst |
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