Immobilization of Ni–Pt nanoparticles on MIL-101/rGO composite for hydrogen evolution from hydrous hydrazine and hydrazine borane

Abstract

As an ideal hydrogen supplier in liquid phase, hydrous hydrazine has gained a lot of attention for safe and efficient storage as well as transportation of hydrogen. Herein, a low Pt-containing Ni–Pt bimetallic catalyst immobilized on novel MIL-101/rGO composite has been prepared by a facile impregnation-reduction approach. Unexpectedly, the resultant Ni 0.9 Pt 0.1 /MIL-101/rGO catalyst exhibits optimal catalytic performance and 100% H 2 selectivity for hydrogen evolution from hydrous hydrazine under alkaline conditions at 323 K, giving a turnover frequency (TOF) value of 960.0 h −1 , which is a relatively higher value ever reported heterogeneous catalysts. Even at room temperature, Ni 0.9 Pt 0.1 /MIL-101/rGO catalyst shows excellent catalytic activity for dehydrogenation of hydrazine as well as hydrazine borane. In addition, the Ni 0.9 Pt 0.1 /MIL-101/rGO catalyst also exhibits excellent durability. Even after eight recycles, the catalytic activity is no significant decrease, and the H 2 selectivity still remains 100%. A low Pt-containing Ni–Pt nanocatalyst immobilized on MOF/rGO composite has been synthesized for hydrogen production from hydrous hydrazine and hydrazine borane. • Ni 0.9 Pt 0.1 /MIL-101/rGO catalyst was prepared via a wet-chemical method. • This catalyst has a unique structure and large specific surface area. • Ni 0.9 Pt 0.1 /MIL-101/rGO exhibits high activity, selectivity and durability. • TOF value of 960.0 for N 2 H 4 dehydrogenation was achieved at 323 K. • Activation energy for N 2 H 4 dehydrogenation is estimated to 50.6 kJ mol −1 .