▎ 摘　　要

NOVELTY - Electrocatalyst comprises a macrocyclic compound and a nano-sized graphene, where the macrocyclic compound is intercalated with the nano-sized graphene by π -π non-covalent interaction. USE - The electrocatalyst is useful for fuel cells (claimed) e.g. electrochemical cell that converts the chemical energy of fuel and oxidizing agent into electricity through a pair of redox reactions and for ammonia synthesis at ambient temperature. ADVANTAGE - The electrocatalyst: provides useful alternative; is responsive towards oxygen and nitrogen reduction reactions; is efficiently used in fuel cells; is facile, cost-effective and scalable; is produced by single step and one-pot process; and exhibits enhanced catalytic performance with oxygen reduction half-wave potential of 0.91 V, excellent methanol crossover tolerance and ammonia production yield. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the electrocatalyst, comprising (a) mixing a predetermined concentration of at least one macrocyclic compound in an aqueous acid solution to obtain an electrolyte solution, (b) immersing at least one pair of graphite electrodes in the electrolyte solution, (c) applying a static potential of a predetermined voltage to the pair of graphite electrodes in the electrolyte solution for a first predetermined time period to obtain a first mass dispersed in the electrolyte solution, (d) ultrasonicating the first mass for a second predetermined time period followed by repeated washing using a fluid medium to obtain a dispersion comprising a second mass (e) separating the second mass from the dispersion to obtain a residue and (f) drying the residue at a predetermined temperature for a third predetermined time period to obtain the electrocatalyst in the form of a powder.