▎ 摘　　要

NOVELTY - Hollow hierarchical porous carbon nanocage electrocatalyst for oxygen reduction reaction, is claimed. The electrocatalyst has a hollow multi-level porous carbon nanocage structure formed by the hybridization of non-metallic heteroatom-doped graphene nanosheets and surface-modified positively charged zeolite imidazole metal covalent organic frameworks. The non-metallic heteroatom-doped graphene nanosheets and zeolitic imidazole metal covalent organic frameworks are in close contact to form nano-heterojunctions. The non-metallic heteroatom is boron, nitrogen, sulfur, phosphorus and/or fluorine. The amount of non-metallic heteroatom-doped graphene nanosheets is 25-50%. The zeolite imidazole metal covalent organic framework is zeolite imidazole framework (ZIF)-8, ZIF-20, ZIF-90, ZIF-4 and/or ZIF-7. USE - Hollow hierarchical porous carbon nanocage electrocatalyst is useful as metal-free cathode material for oxygen reduction reaction. ADVANTAGE - The catalyst greatly reduces the commercial cost of the hydrogen fuel cell, with large scale commercial application potential value, which can effectively promote the rapid development of energy economy. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing hollow hierarchical porous carbon nanocage electrocatalyst.