
Synthesis of ZIF-8 derived high-efficiency Fe-N-C catalyst and its oxygen reduction reaction performance
Saihang ZHANG, Yingying YAO, Zhao LI, Jianxin ZOU
Synthesis of ZIF-8 derived high-efficiency Fe-N-C catalyst and its oxygen reduction reaction performance
To promote the large-scale commercial application of fuel cells, efficient, stable, and low-cost oxygen reduction reaction (ORR) catalysts should be developed. In this study, a Fe-doped ZIF-8 is used as the precursor, and the Fe-N-C non-precious metal catalyst is obtained by ball milling, calcination under a high-temperature argon atmosphere, pickling, and secondary calcination under an ammonia atmosphere. The results of various characterization methods show that Fe atoms are uniformly dispersed on the nitrogen-doped carbon framework, thus forming abundant Fe-N x active sites. The electrochemical performance test results show that the Fe-N-C-5% catalyst with optimized preparation process and metal contents exhibits excellent ORR activity in 0.1 mol/L HClO4 acidic solution, with a half-wave potential of 0.845 V. Meantime, it has good stability, and the half-wave potential does not drop significantly after 20000 cycles. These results provide an effective strategy for the rational design of precious metal-free ORR catalysts in the future.
oxygen reduction reaction / non-precious metal catalyst / proton exchange membrane fuel cell / electrocatalysis / metal-organic framework
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