“On-off”controlled H2 evolution and O2 evolution upon NH3BH3 hydrolysis resp·H2O2 decomposition on Pt/ZIF-67

Abstract

In spite of significant developments are accomplished in the exploration of H2 and O2 evolution upon water electrolysis/photolysis, this remains a challenge to design and develop ideal catalytic systems for this reaction and to isolate H2 from H2-O2 mixture with membranes. Herein, a series of ZIF-67-supported transition metal nanoparticles (TMNPs/ZIF-67), including Pt, Ir, Pd, Rh, Au and Ag, via immobilization of ultrafine TMNPs at the surface of ZIF-67, have been designed and developed for the selective H2 generation from NH3BH3 hydrolysis and O2 evolution upon H2O2 decomposition. In particular, the optimized nanocatalyst Pt/ZIF-67 presents the super-high catalytic property in the both H2 evolution upon NH3BH3 hydrolysis (689 mol(H2)·molPt-1·min−1) and O2 evolution upon H2O2 decomposition (979 mol(O2)·molPt-1·min−1) at 30 °C. Importantly, the selective “on–off” control for demand-based H2 generation from NH3BH3 hydrolysis was successfully realized by Zn2+/EDTA-2Na system. This highly efficient Pt/ZIF-67 proposed a new method for the promising potential application of ammonia borane and hydrogen peroxide as an economic and safe H2resp. O2 carrier for fuel cell.