CoMn₂O₄(Co_1-xS)/Graphene Aerogel As Efficient Oxygen Electrode Catalysts

With the depletion of traditional energy resources,we need to find a new energy to replace traditional energy.Direct methanol fuel cell has become the most potential and new type of green energy.Pt and RuO₂ are chosen as the traditional cathode catalysts.However,the high price,poor stability in long-term operation as well as crossover effects,has restricted their utilizations.Thereby,we need to find a cathode catalyst,which has higher catalytic activity,lower price,better methanol tolerance and stability.We present two hybrids composed of CoMn₂O₄ nanoparticles supported on N,P dual-doped graphene aerogel?CoMn₂O₄/NPGA?and Co_1-xS supported on N,S dual-doped graphene aerogel(Co_1-xS/NSGA).CoMn₂O₄/NPGA catalyst was successfully fabricated by hydrothermal and wet-chemical methods.We present a novel hybrid of Co_1-xS/NSGA,which is fabricated by combination of hydrothermal method with pyrolysis procedure.Electrochemical measurements demonstrate that the catalytic activities of CoMn₂O₄/NPGA and Co_1-xS/NSGA are similar to Pt/C.They are all four-electron transfer pathway and display better methanol tolerance and durability than Pt/C.The OER activity of Co_1-xS/NSGA is similar to the RuO₂ catalyst.These excellent properties make them good catalysts for application in alkaline fuel cells.