The invention discloses a Co-B / NGO composite nanometer material. The Co-B / NGO composite nanometer material is prepared by firstly performing in-site reduction on
nitrogen-
doped graphene and inorganiccobalt salt through
sodium borohydride and then performing freezing-
drying, the specific area is 40-100 m<2>g<-1>; the material is magnetic, and can be attracted by a
magnet. When the composite nanometer material is used as a catalyst for hydroboron
hydrogen generation by
hydrolysis, the
hydrogen desorption rate is 500-1700mL / min<-1>g<-1>, and the
hydrogen production rate is 100%; the material canbe adsorbed and recycled by the
magnet, the recycling rate reaches 99.5%, and the
hydrogen production rate after being circulated is maintained at 100-1530mL min<-1>g<-1>, namely, maintaining 50-85%of the initial
hydrogen production rate. The preparation method comprises the following steps: 1) precursor preparation: adding
nitrogen-
doped graphene and inorganic
cobalt salt in an aqueous solutionfor
ultrasonic dispersion mixing, reducing by using
sodium borohydride, and finally centrifuging and washing to obtain a precursor; 2) preparation of the Co-B / NGO composite nanometer material: freeze-
drying the precursor to obtain the Co-B / NGO composite nanometer material. The Co-B / NGO composite nanometer material disclosed by the invention is simple in preparation, has more excellent
catalysis performance, and has an extensive application prospect in the application field of the hydroboron hydrogen generation by
hydrolysis.