期刊
SMALL
卷 17, 期 29, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202101001
关键词
concave porous structures; FeC; (x) nanoclusters; Fe-N; (4); oxygen reduction reaction; sulfate Ions
类别
资金
- National Natural Science Foundation of China [52002299, 22075223, 51872214]
- National Key Research and Development Program of China [2016YFA0202603]
In this work, an efficient oxygen reduction electrocatalyst is designed with high exposure of active sites in a carbon matrix, accelerating mass transfer and showing impressive activity and stability. The catalyst exhibits higher ORR activity compared to commercial platinum carbon in different media, highlighting its great potential for application.
To improve the catalytic activity of the catalysts, it is key to intensifying the intrinsic activity of active sites or increasing the exposure of accessible active sites. In this work, an efficient oxygen reduction electrocatalyst is designed that confines plentiful FeCx nanoclusters with Fe-N-4 sites in a concave porous S-N co-doped carbon matrix, readily accessible for the oxygen reduction reaction (ORR). Sulfate ions react with the carbon derived from ZIF-8 at high temperatures, leading to the shrinkage of the carbon framework and then forming a concave structure with abundant macropores and mesopores with S incorporation. Such an architecture promotes the exposure of active sites and accelerates remote mass transfer. As a result, the catalyst (Fe/S-NC) with a large number of C-S-C, Fe-N-4, and FeCx nanoclusters presents impressive ORR activity and stability. In alkaline media, the half-wave potential of the best catalyst (Fe/S-2-NC) is 0.91 V, which far exceeds that of commercial platinum carbon (0.85 V), while in acidic media the half-wave potential reaches 0.784 V, comparable to platinum carbon (0.812 V). Furthermore, for the zinc-air battery, the outstanding peak power density of Fe/S-2-NC (170 mW cm(-2)) superior to platinum carbon (108 mW cm(-2)) also highlights its great application potential.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据