Controlled Synthesis of MOF-Encapsulated NiPt Nanoparticles
toward Efficient and Complete Hydrogen Evolution from Hydrazine Borane
and Hydrazine
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Abstract
The catalytic dehydrogenation of
hydrazine borane (N<sub>2</sub>H<sub>4</sub>BH<sub>3</sub>) and hydrous
hydrazine (N<sub>2</sub>H<sub>4</sub>·H<sub>2</sub>O) for H<sub>2</sub> evolution is
considered as two of the pivotal reactions for the implementation
of the hydrogen-based economy. A reduction rate controlled strategy
is successfully applied for the encapsulating of uniform tiny NiPt
alloy nanoclusters within the opening porous channels of MOFs in this
work. The resultant Ni<sub>0.9</sub>Pt<sub>0.1</sub>/MOF core–shell
composite with a low Pt content exerted exceedingly high activity
and durability for complete H<sub>2</sub> evolution (100% hydrogen
selectivity) from alkaline N<sub>2</sub>H<sub>4</sub>BH<sub>3</sub> and N<sub>2</sub>H<sub>4</sub>·H<sub>2</sub>O solution. The
features of small NiPt alloy NPs, strong synergistic effect between
NiPt alloy NPs and the MOF, and open pore structure for freely mass
transfer made NiPt/MIL-101 an excellent catalyst for highly efficient
H<sub>2</sub> evolution from N<sub>2</sub>H<sub>4</sub>BH<sub>3</sub> or N<sub>2</sub>H<sub>4</sub>·H<sub>2</sub>O
