▎ 摘　　要

NOVELTY - Preparation of supported ultra-small Prussian blue analog involves (1) mixing and reacting trivalent metal compound, divalent metal compound, solvent (A), ligand and graphene to obtain graphene-loaded ultra-small Prussian blue analog, (2) and reacting by dispersing graphene-loaded ultra-small Prussian blue analog turbid liquid in solvent (A), and adding reducing agent and alkaline solution. USE - Preparation of supported ultra-small Prussian blue analog used as electrochemical catalyst for catalyzing nitrogen in ammonia synthesis (all claimed). ADVANTAGE - The supported ultra-small Prussian blue analog prepared is a composite structure of Prussian blue analog in graphene which improves electrical power of the catalyst.