Preparation Of Non-noble Metal Polymer Based Nitrogen-doped Carbon Materials And Their Catalytic Properties For Oxygen Reduction

Fuel cells are promising new energy conversion devices whose energy conversion is green and efficient.The sluggish oxygen reduction(ORR)reaction kinetics together with the high cost and scarcity of Pt-based catalysts has become the biggest barrier to the commercial application of the fuel cells.To resolve this issue,this paper is devoted to design and synthesize the transition metal nitrogen-doped carbon(M-N/C)catalysts with high activity and stability.The main research contents were shown as follows:(1)Synthesis and preparation of Co-N/C catalyst based on DATEA.Co-N/C catalyst was prepared by directly pyrolyzing the metal coordination polymer Co-DATEA,which was synthesized by the coordination between the metal Co and DATEA.DATEA was synthesized by using ethylene diamine and CDTA(4,6-(dipyridin-2-ylamino)]-1,3,5 triazine)as the reactants.Mass spectrometry(MS)and nuclear magnetic resonance(NMR)had been used to investigate the structures of CDTA and DATEA.The morphology and structure of Co-N/C-800 were characterized by SEM,BET and XPS.The electrochemical measurements showed that Co-N/C-800 possessed good ORR electrocatalytic activity and high stability.The onset potential of Co-N/C-800 catalyst is-0.063 V(vs.Ag/AgCl)and the limiting current density is 4.93 mA cm-2.(2)Synthesis and preparation of Co-N/C catalyst based on TDAT.Co-N/C catalyst was prepared by directly pyrolyzing the metal coordination polymer Co-TDAT,which was synthesized by the coordination between the metal Co and 2,4,6-tris(di-2-pyridylamino)-1,3,5-triazine(TDAT).TDAT was synthesized by using cyanuric chloride and 2,2'-bipyridylamine as the reactants.Mass spectrometry(MS)and nuclear magnetic resonance(NMR)had been used to investigate the structures of TDAT.The morphology and structure of Co-N/C-800 were characterized by SEM,BET and XPS.The electrochemical measurements showed that Co-N/C-800 possessed good ORR electrocatalytic activity and high stability.The onset potential of Co-N/C-800 catalyst is-0.058 V(vs.Ag/AgCl)and the limiting current density is 6.20 mA cm-2.