▎ 摘　　要

Graphene-rich bi-metallic nano-hybrid G(1)Co(0.3)Ni(0.15) consisting of novel nano-matrix structure, a low-cost catalyst was formulated for enhanced H-2 generation from hydrolysis of NaBH4. The formulation was based on the optimization of the performance of G-Co-Ni nano-catalysts by tuning their morphology. Three types of catalysts namely metal-rich G(1)Co(1.5)Ni(1.5), 1: 1 Graphene-Metal G(1)Co(0.6)Ni(0.4), and Graphene-rich G(1)Co(0.3)Ni(0.15) were synthesized. These catalysts were characterized using SEM with EDAX, HR-TEM, XRD and CV analysis and tested for H-2 generation. Based on morphology, three major nano-hybrid structure models namely nano-ensembles, unique nano-alloy structure, nano-matrix were identified over the whole composition range. HRTEM analysis revealed that increase in wt% of graphene (from 25-70) transforms dispersed nano-ensembles to the connected nano-matrix. Among the three catalyst, Graphene-rich G(1)Co(0.3)Ni(0.15), exhibits the highest catalytic activity (TOF=16.5 min(-1), ECSA=286.5 m(2)/g) and electrochemical stability. The activation energy of the catalytic hydrolysis using G(1)Co(0.3)Ni(0.15) catalyst is 23 +/- 1 kJ mol(-1.)