期刊
ADVANCED MATERIALS
卷 31, 期 15, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201807468
关键词
cobalt oxide; enhanced conductivity; flexible Zn-air battery; high specific power; one-nanometer scale; ultrathin layer
类别
资金
- National Basic Research Program of China [2015CB932302]
- National Natural Science Foundation of China [21890751, 91745113, 11621063]
- National Program for Support of Top-notch Young Professionals
- Fundamental Research Funds for the Central Universities [WK2060190084]
- Major/Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology [2016FXZY001]
- USTC Center for Micro and Nanoscale Research and Fabrication
Synergistic improvements in the electrical conductivity and catalytic activity for the oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) are of paramount importance for rechargeable metal-air batteries. In this study, one-nanometer-scale ultrathin cobalt oxide (CoOx) layers are fabricated on a conducting substrate (i.e., a metallic Co/N-doped graphene substrate) to achieve superior bifunctional activity in both the ORR and OER and ultrahigh output power for flexible Zn-air batteries. Specifically, at the atomic scale, the ultrathin CoOx layers effectively accelerate electron conduction and provide abundant active sites. X-ray absorption spectroscopy reveals that the metallic Co/N-doped graphene substrate contributes to electron transfer toward the ultrathin CoOx layer, which is beneficial for the electrocatalytic process. The as-obtained electrocatalyst exhibits ultrahigh electrochemical activity with a positive half-wave potential of 0.896 V for ORR and a low overpotential of 370 mV at 10 mA cm(-2) for OER. The flexible Zn-air battery built with this catalyst exhibits an ultrahigh specific power of 300 W g(cat)(-1), which is essential for portable devices. This work provides a new design pathway for electrocatalysts for high-performance rechargeable metal-air battery systems.
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