▎ 摘　　要

NOVELTY - Composite comprises graphene, a metalloprotein and a conjugated porous organic polymer. USE - The composite is useful: in an article including an electrode, preferably a miniature electrode for a medical device; for gas sensing and electrochemical heterogeneous catalysis, preferably electrochemical heterogeneous catalysis; for heterogeneous catalysis of oxygen reduction reactions; and for oxygen sensing (all claimed). ADVANTAGE - The composite exhibits improved the electrical properties of porous organic polymers. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) making (M1) the composite, comprising mixing graphene, the metalloprotein and the conjugated porous organic polymer; and (2) catalyzing (M2) an oxygen reduction reaction, comprising bringing a material to be oxidized into contact with an electrode comprising the composite.