Study of the Secondary Heteroatoms Doping on Nitrogen-Doped Carbon and Their Oxygen Reduction Reaction Performance Evaluation

摘要

The dual heteroatom doped mesoporous carbon (MC) is an excellent substitute for platinum-based catalyst in cathodic oxygen reduction reaction (ORR) of fuel cells. In this work, nitrogen (N) as the primary heteroatom doping, phosphorus (P), boron (B), and sulfur (S) as the secondary heteroatom doping are introduced in the MC framework. Santa barbara amorphous (SBA-15) employed as the supporting material to investigate the secondary heteroatom doping effect on MC towards ORR performance. Compared with B and S doping, the P doping modifies the charge delocalization in the MC structure. In addition, it enhances the surface area (971 m(2)/g), defect sites (1.18), high pyridinic (28.72 %) and high graphitic content (44.42 %) thereby facilitated the remarkable ORR activity. Moreover, electrochemical studies proved that N and P dual doped mesoporous carbon (NPMC) has a better carrier concentration (5.58x10(15) cm(-3)) and higher flat band potential (0.548 V vs RHE) which is confirmed by the Mott-Schottky analysis. Further, ORR studies demonstrated that NPMC material exhibited more positive onset potential (0.86 V), two-electron pathway, lower Tafel slope (63 mV/dec) as well as R-ct (11 omega/cm(2)). In addition, the resultant material is found to be highly active towards ORR with excellent methanol tolerance and stability.