Synthesis And Catalytic Performance Of Carbon-Based Non-noble Metal Catalysts

Zinc air battery has the advantages of high theoretical energy density,environmental protection,safety and reliability,and has broad application prospects.However,the widely used precious metal catalysts are expensive and have poor stability,which limits the commercial application of zinc-air batteries.Carbon nanomaterials have the advantages of large specific surface area,high electrical conductivity,and low cost.The catalytic performance can be improved by doping with nitrogen,and the transition metal is introduced to have excellent bifunctional catalytic performance.In this paper,carbon-based non-precious metal catalysts were prepared by a simple hightemperature pyrolysis process,and their catalytic properties were studied.Firstly,a polyimide membrane was used as carbon source and nitrogen source,and cobalt acetate tetrahydrate was used as cobalt source.Cobalt-nitrogen co-doped carbon nanomaterial(Co/N/C)catalysts were prepared by simple high-temperature pyrolysis.The characterization results showed that the cobalt element in the Co/N/C material is distributed inside and on the surface of the porous carbon nanomaterial.The carbon materials exhibit a large number of mesoporous structures with a large specific surface area;The nitrogen element is mainly present in the form of pyridinium nitrogen.The Co/N/C materials exhibit good oxygen reduction/oxygen precipitation bifunctional catalytic activity in an alkaline solution.Applied them to the air electrode of a zinc air battery,the Co/N/C materials exhibit excellent bifunctional catalytic performance and good cycle stability.Sublimation sulfur powder was introduced as sulfur source,polyimide membrane was used as carbon source and nitrogen source,cobalt acetate tetrahydrate was used as cobalt source,and cobalt-sulfur nitrogen co-doped carbon nanomaterial catalyst(CoS/N/C)was prepared by high temperature pyrolysis.The characterization results show that the cobalt sulfide particles in Co-S/N/C are distributed on the surface of the nanocarbon material.The carbon material exhibits the characteristics of graded porosity,large specific surface area,and high content of pyridinium nitrogen and graphite nitrogen.Co-S/N/C exhibits good oxygen reduction/oxygen precipitation bifunctional catalytic activity in alkaline solution.Applied it to the air electrode of zinc air battery,and the catalyst exhibited better catalytic performance and cycle stability than Pt/C catalyst...