期刊
ADVANCED MATERIALS
卷 32, 期 30, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202003134
关键词
bifunctional electrocatalysis; Janus catalysts; single atoms; Zn-air batteries
类别
资金
- National Natural Science Foundation of China [21875112, 21902078]
- Australian Research Council (ARC) [DE150101306, LP160100927]
- Faculty of Science Strategic Investment Funding of University of Newcastle
- CSIRO Newcastle Energy Centre
- National and Local Joint Engineering Research Center of Biomedical Functional Materials
- Priority Academic Program Development of Jiangsu Higher Education Institutions
Nitrogen-coordinated metal single atoms in carbon have aroused extensive interest recently and have been growing as an active research frontier in a wide range of key renewable energy reactions and devices. Herein, a step-by-step self-assembly strategy is developed to allocate nickel (Ni) and iron (Fe) single atoms respectively on the inner and outer walls of graphene hollow nanospheres (GHSs), realizing separate-sided different single-atom functionalization of hollow graphene. The Ni or Fe single atom is demonstrated to be coordinated with four N atoms via the formation of a Ni-N(4)or Fe-N(4)planar configuration. The developed Ni-N-4/GHSs/Fe-N(4)Janus material exhibits excellent bifunctional electrocatalytic performance, in which the outer Fe-N(4)clusters dominantly contribute to high activity toward the oxygen reduction reaction (ORR), while the inner Ni-N(4)clusters are responsible for excellent activity toward the oxygen evolution reaction (OER). Density functional theory calculations demonstrate the structures and reactivities of Fe-N(4)and Ni-N(4)for the ORR and OER. The Ni-N-4/GHSs/Fe-N(4)endows a rechargeable Zn-air battery with excellent energy efficiency and cycling stability as an air-cathode, outperforming that of the benchmark Pt/C+RuO(2)air-cathode. The current work paves a new avenue for precise control of single-atom sites on carbon surface for the high-performance and selective electrocatalysts.
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