The invention belongs to the field of preparation and application of
energy source materials and discloses a
nitrogen-
doped carbon nanotube / Co composite catalyst and a preparation method and application thereof. The preparation method includes: 1), respectively preparing
melamine,
cobalt salt and P123 into water solutions; 2), adding the
melamine solution into the P123 solution, stirring for mixing, adding the
cobalt salt solution, stirring for mixing, performing ultrasonic treatment, and heating while stirring until water is evaporated to obtain a precursor material; 3), pre-calcining the precursor material at 200-400 DEG C in an
inert gas
atmosphere, calcining at 450-600 DEG C and at 750-900 DEG C respectively, using an acid solution for soaking, cleaning, and
drying to obtain the composite catalyst. The catalyst is high in
oxygen reduction and
oxygen evolution catalytic activity and stability and has high
hydrogen evolution catalytic activity and stability in an acidic condition. The preparation method is simple, extensive in
raw material source, low in cost and suitable for large-scale production. The composite catalyst is used in the field of integrated regenerative
fuel cells.