Proton exchange membrane fuel cells(PEMFCs)have not been applied on a large scale due to their expensive platinum-based catalysts and scarce resources.Metal-nitrogen doped carbon(M-N-C,M=Fe,Ni,Mn,Co)monoatom-ic catalysts have been considered as promising catalysts for oxygen reduction reaction(ORR),among which Fe-N-C cat-alysts have high catalytic activity for oxygen reduction in acidic media with low cost.However,most of the reported Fe-N-C catalysts are still not as good as the platinum-based catalysts in fuel cells and have poor stability in acidic media rather than being widely used.Here,we reported a method for constructing Fe-Nx and Co-N,catalysts on a stable and highly graphitic NC support pyrolyzed from ZIF-67.The obtained Co/Fe-N-C diatomic catalyst achieved an onset poten-tial(Eoneset)of 0.96 V(vs.RHE)and a half-wave potential(E1/2)of 0.79 V(vs.RHE),with more remarkable stabili-ty and superior ORR activity compared with the Fe-N-C and Co-N-C catalysts,providing a new insight into enhance the activity and durability of Fe-N-C catalysts.
关键词
质子交换膜燃料电池/氧还原反应/双金属催化剂/氮掺杂碳/活性位点
Key words
Proton exchange membrane fuel cell/oxygen reduction reaction/bimetallic catalyst/nitrogen-doped carbon/active site
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