Zn-MOF-74-derived graphene nanosheets supporting CoB alloys for promoting hydrolytic dehydrogenation of sodium borohydride

The development of an efficient tactic for enhancing the catalytic activity toward hydrolytic dehydrogenation of sodium borohydride (NaBH 4 ) is of vital significance but remains a long-standing challenge. In this work, CoB alloys were successfully anchored on MOF-74-derived graphene nanosheets (GNS) via the reduction process. As support, GNS can provide a high dispersion of CoB alloys to expose more active sites. Moreover, the existence of a synergistic effect between CoB alloys and GNS is verified by a series of well-designed control experiments. Therefore, a low activation energy ( E a = 38.8 kJ·mol –1 ) and a high hydrogen generation rate (HGR = 7937 ml H2· min -1 · g -1 ) are simultaneously achieved for the optimized Co 1 B/GNS catalyst. In addition, Co 1 B/GNS has decent recyclability, i.e., 58% of the initial HGR remaining after ten successive cycles of NaBH 4 hydrolysis. This work provides a feasible approach for fabricating high-performance non-noble metal catalysts for hydrolytic dehydrogenation of NaBH 4 . • GNS is prepared from MOF-74 via a two-step heating strategy. • CoB/GNS exhibits superior catalytic activity toward NaBH 4 hydrolysis. • A high HGR of 7937 ml H2· min -1 · g -1 and low E a of 38.8 kJ·mol -1 are simultaneously achieved. • Enhanced performance originates from the alteration of electronic structure and synergistic effect in CoB/GNS.