期刊
ADVANCED MATERIALS
卷 30, 期 46, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201804504
关键词
catalysis; flexible materials; iron-carbon species; zinc-air batteries
类别
资金
- National Natural Science Foundation of China [21875221, 21571157, U1604123]
- Outstanding Young Talent Research Fund of Zhengzhou University [1521320001]
- Young Outstanding Teachers of University program in Henan Province [2016-130]
- Creative Talents in the Education Department program of Henan Province [19HASTIT039]
- Open Project Foundation of Key Laboratory of Advanced Energy Materials Chemistry of Nankai University [2017-29]
- Open Project Foundation of the State Key Laboratory of Inorganic Synthesis and Preparation Chemistry of Jilin University
During the preparation of atomically dispersed Fe-N-C catalysts, it is difficult to avoid the formation of iron-carbide-containing iron clusters (FexC/Fe), along with the desired carbon matrix containing dispersed FeNx sites. As a result, an uncertain amount of the oxygen reduction reaction (ORR) occurs, making it difficult to maximize the catalytic efficiency. Herein, sulfuration is used to boost the activity of FexC/Fe, forming an improved system, FeNC-S-FexC/Fe, for catalysis involving oxygen. Various spectroscopic techniques are used to define the composition of the active sites, which include Fe-S bonds at the interface of the now-S-doped carbon matrix and the FexC/Fe clusters. In addition to outstanding activity in basic media, FeNC-S-FexC/Fe exhibits improved ORR activity and durability in acidic media; its half-wave potential of 0.821 V outperforms the commercial Pt/C catalyst (20%), and its activity does not decay even after 10 000 cycles. Interestingly, the catalytic activity for the oxygen evolution reaction (OER) simultaneously improves. Thus, FeNC-S-FexC/Fe can be used as a high-performance bifunctional catalyst in Zn-air batteries. Theoretical calculations and control experiments show that the original FeNx active centers are enhanced by the FexC/Fe clusters and the Fe-S and C-S-C bonds.
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