Abstract
In spite of the fact that remarkable developments are achieved in the design and development of novel nanocatalysts for H2 release upon dimethylamineborane hydrolysis, the development of an "on-off" switch for demand-based H2 evolution upon dimethylamineborane hydrolysis is still a matter of supreme importance, however. Herein, we synthesized a string of MoS2 nanosheet-supported RuNi bimetallic nanohybrids (RuxNi1-x/MoS2), by fixation of RuNi nanoparticles at the MoS2 surface, for the H2 evolution upon the hydrolysis of dimethylamineborane at 30 °C. For safely and effectively generating, transporting, and storing H2 gas, the selective "on-off" switch for on-demand H2 evolution upon dimethylamineborane hydrolysis over the Ru0.8Ni0.2/MoS2 nanohybrid has been successfully realized by the Zn2+/EDTA-2Na system. In particular, the H2 evolution is totally switched off by adding Zn(NO3)2. It seems that Zn2+ ions are attached and anchored at the Ru0.8Ni0.2/MoS2 surface, inhibiting their surface-active sites, leading to the termination of H2 evolution. Then, the H2 generation is subsequently reactivated by adding the EDTA-2Na solution because of its excellent coordination ability with Zn2+ 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 H2 production.
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