"On-Off" Control for On-Demand H 2 Release upon Dimethylamineborane Hydrolysis over Ru 0.8 Ni 0.2 /MoS 2 Nanohybrids.

In spite of the fact that remarkable developments are achieved in the design and development of novel nanocatalysts for H 2 release upon dimethylamineborane hydrolysis, the development of an "on-off" switch for demand-based H 2 evolution upon dimethylamineborane hydrolysis is still a matter of supreme importance, however. Herein, we synthesized a string of MoS 2 nanosheet-supported RuNi bimetallic nanohybrids (Ru x Ni 1- x /MoS 2 ), by fixation of RuNi nanoparticles at the MoS 2 surface, for the H 2 evolution upon the hydrolysis of dimethylamineborane at 30 °C. For safely and effectively generating, transporting, and storing H 2 gas, the selective "on-off" switch for on-demand H 2 evolution upon dimethylamineborane hydrolysis over the Ru 0.8 Ni 0.2 /MoS 2 nanohybrid has been successfully realized by the Zn 2+ /EDTA-2Na system. In particular, the H 2 evolution is totally switched off by adding Zn(NO 3 ) 2 . It seems that Zn 2+ ions are attached and anchored at the Ru 0.8 Ni 0.2 /MoS 2 surface, inhibiting their surface-active sites, leading to the termination of H 2 evolution. Then, the H 2 generation is subsequently reactivated by adding the EDTA-2Na solution because of its excellent coordination ability with Zn 2+ ions. This study not only offers a new and efficient RuNi nanocatalyst for dimethylamineborane hydrolysis but also proposes a new method for the demand-based H 2 production.