Atomically Dispersed Iron-Nitrogen Species as Electrocatalysts for Bifunctional Oxygen Evolution and Reduction Reactions

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• 作者：Pengzuo Chen ; Tianpei Zhou ; Lili Xing ; Dr. Kun Xu ; Yun Tong ; Hui Xie ; Dr. Lidong Zhang ; Dr. Wensheng Yan ; Dr. Wangsheng Chu ; Prof. Changzheng Wu and Prof. Yi Xie
• 刊名：Angewandte Chemie
• 出版年：2017
• 出版时间：January 9, 2017
• 年：2017
• 卷：129
• 期：2
• 页码：625-629
• 全文大小：1442K
• ISSN：1521-3757

文摘

Rational design of non-noble materials as highly efficient, economical, and durable bifunctional catalysts for oxygen evolution and reduction reactions (OER/ORR) is currently a critical obstacle for rechargeable metal-air batteries. A new route involving S was developed to achieve atomic dispersion of Fe-N_x species on N and S co-decorated hierarchical carbon layers, resulting in single-atom bifunctional OER/ORR catalysts for the first time. The abundant atomically dispersed Fe-N_x species are highly catalytically active, the hierarchical structure offers more opportunities for active sites, and the electrical conductivity is greatly improved. The obtained electrocatalyst exhibits higher limiting current density and a more positive half-wave potential for ORR, as well as a lower overpotential for OER under alkaline conditions. Moreover, a rechargeable Zn–air battery device comprising this hybrid catalyst shows superior performance compared to Pt/C catalyst. This work will open a new avenue to design advanced bifunctional catalysts for reversible energy storage and conversion devices.