Improving the Hydrogen Release Capacity of NaBH<sub>4</sub> via Mediation of Catalysts with Rare Metal Compounds

Abstract

This paper reports on doping with the catalysts consist of rare metal compounds like Co2B, La(NO3)3, Ce(SO4)2, Ti(SO4)2, CeCl3, LaCl3 and mixed catalysts for improving hydrogen release capacity of NaBH4. The results show that the hydrogen generation volume (HGV) is about 10ml and the hydrogen generation rate (HGR) is very low when doping with La(NO3)3, Ce(SO4)2, Ti(SO4)2, CeCl3 and LaCl3. Comparatively, Co2B presents favorable catalytic effect on hydrogen generation properties of NaBH4. The study on the mixed catalysts find that the HGV of the samples doped with mixed catalyst of Co2B and Ce(SO4)2 is the largest. Among all doped samples, the HGV of sample doped with 5Co2B\2Ce(SO4)2 is the largest about 317ml. Compared to all samples doped with mixed catalysts, the samples doped with mixed catalysts of Co2B, Ce(SO4)2, Ti(SO4)2 and CeCl3 presents the best properties of hydrogen release. However, compared to Co2B, doping with other catalysts makes the hydrogen release time of NaBH4 longer. Overall, NaBH4 doped with the mixed catalysts of Co2B, Ti(SO4)2 and CeCl3 present the optimal HGV and HGR than doped with any other catalysts.