▎ 摘　　要

NOVELTY - A reduced graphene oxide-heptapalladium diselenide (rGO-Pd7Se2) composite structure nanomaterial, is claimed. In the rGO-Pd7Se2 composite structure nanomaterial, heptapalladium diselenide nanoparticles are uniformly anchored on the reduced graphene oxide, where the heptapalladium diselenide nanoparticles have a particle size of 80-150 nm and a nearly cubic shape. USE - The nanomaterial is useful as cathode catalytic material of electro-catalysis nitrogenfixation (claimed). ADVANTAGE - The material exhibits excellent catalytic performance and continuous electrolytic stability in the electro-catalysis solid nitrogen. The synthesis process is simple; the toxicity is low; the reaction condition is mild and the cost is low. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing rGO-Pd7Se2 composite structure nano material