Rh0.7Ru0.3-MoOx supported on carbon nanotubes boosts hydrogen generation from hydrazine borane at room temperature

Abstract

Hydrazine borane (HB, N2H4BH3) is gaining attention as a promising chemical hydrogen storage material due to its impressive hydrogen capacity (15.4 wt%) and stability under normal conditions. However, its dehydrogenation properties have remained unsatisfactory despite numerous efforts. In this study, we have successfully developed rhodium-ruthenium nanoparticles modified with MoOx and supported on carbon nanotubes (Rh0.7Ru0.3-MoOx/CNTS) using a facile co-reduction method. Surprisingly, the Rh0.7Ru0.3-MoOx/CNTS catalyst exhibits outstanding performance, surpassing all previously reported activities for HB dehydrogenation. It demonstrates a high turnover frequency (TOF) value of 4412 h−1 at 303 K, 100 % selective conversion of hydrogen, and excellent stability. Through XPS, TEM, BET, and XRD analysis, we have determined that the exceptional performance of Rh0.7Ru0.3-MoOx/CNTS can be attributed to the synergistic effect of CNTS and MoOx on the catalyst's electronic structure, crystal structure, and particle size. These results provide a solid foundation for the potential application of HB in hydrogen fuel cells.