High efficiency and durability are two key targets for developing electrochemical catalysts for oxygen reduction reaction (ORR). Here, B/N co-doping porous carbon shell encapsulated Fe2N nanoparticles (NPs) was synthesized as...
We report a bimetallic catalyst Mn0.1Co0.3/NC-2, which excellent ORR activity in alkaline and acidic electrolytes, due to the increased number of M–Nx active sites by secondary doping and the synergistic effect of the Mn and Co bimetals.
Nitrogen‐doped carbon is considered one of the most promising oxygen reduction catalysts due to its low cost and high activity, however, it still falls short of Pt/C. In this study, we report a strategy for the preparation of highly reactive N‐doped hierarchical porous carbon by primary pyrolysis using zinc acetate as a stand‐alone zinc source and amino‐rich reactants as carbon and nitrogen sources to introduce Zn‐Nx structures into mesoporous structures generated by the hard template method using the strong coordination of zinc and amino groups. Benefited from the simultaneous optimization of the hierarchical porous structure and nitrogen‐doping, the half‐wave potential of Zn(OAc)2–DCD/HPC is as high as 0.909 V vs. RHE, much better than that of commercial Pt/C catalysts (0.872 V vs. RHE). In addition, zinc‐air batteries assembled with Zn(OAc)2–DCD/HPC (Pmax=198 mW cm−2) as the cathode exhibit higher peak power density compared to Pt/C (Pmax=168 mW cm−2). This strategy might open up new opportunities for designing and developing highly active metal‐free catalysts.
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