| 摘要： |
Exploring low-cost, highly effective and durable nonprecious electrocatalysts for oxygen reduction reaction (ORR) is the key issue for large-scale applications of fuel cell technology. However, preparation of Fe-N-C ORR catalysts using biomass without any external sources containing nitrogen and iron elements has rarely been reported. In this paper, hierarchically porous carbon self-co-doped with Fe and N promoted by NaCl has been successfully synthesized through a facile one-step pyrolysis method using pig blood curds (PBCs) without any external Fe and N. Besides, Fe and N are uniformly dispersed within the as-synthesized electrocatalysts. Electrochemical tests showed that the best performing Fe-N-C electrocatalyst exhibited superior ORR catalytic activity with a positive half-wave potential of 0.834 V vs. RHE and a high limiting current density of 5.6 mA cm(-2). Furthermore, the as-synthesized electrocatalyst also showed remarkable long-term stability as well as superior methanol tolerance, outperforming commercial Pt/C. The facile synthesis of high-performance Fe-N-C electrocatalysts derived from PBCs using NaCl as the pore former provides fundamental insight and offers important guidelines for the future design of biomass-derived carbons in specific energy applications. |
