Graphene Edges Enhanced Anchoring of Well Exposed Cobalt Clusters via Strong Chemical Bonding for Accelerating Oxygen Reduction Reaction
Sufficient anchoring tansitional metals on supporting materials with well exposed metal atoms and tuned chemical bonds of them is crucially important for designing high performance electrocatalysts. In this work we have adopted a strategy of using defective carbon nanotube to synthesis holey graphene oxide with tunable basal plane hole size. Via in-situ formation of cobalt clusters during process of doping nitrogen in holey graphene oxide, the obtained composite has shown strong chemical bonding of highly exposed cobalt with nitrogen and carbon on nitrogen doped holey graphene. Basal plane hole of graphene benifited deposition of cobalt were found. Detaild analysis shows that rich defects on basal plane benifite doping of pyridinic nitrogen and graphitic nitrogen and enhanced chemical bonding of cobalt with nitrogen, which have improved four electron transfer selectivity of ORR. Thus effectively enhanced catalytic activity of composite is comparable to commercial Pt/C catalyst and superior stability than it.