Journal
SMALL
Volume 14, Issue 48, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201803409
Keywords
all-in-one air electrodes; bifunctional catalysts; carbon nanotube films; large-scale; Zn-air batteries
Categories
Funding
- National Natural Science Foundation of China [21773293, 21603264]
- CAS Pioneer Hundred Talents Program
- National Key Research and Development Program of China [2016YFA0203301]
- Key Research Program of Frontier Science of Chinese Academy of Sciences [QYZDB-SSW-SLH031]
Ask authors/readers for more resources
As a promising energy-storage device, rechargeable Zn-air batteries have attracted considerable interests. Herein, a bifunctional oxygen electrode film prepared by adhering NiCo2O4 nanosheets to a nitrogen and oxygen dual-doped carbon nanotubes film in a large scale is reported. The resulting self-supporting film electrode is multifunctional, which integrates a porous conducting structure for air diffusion and charge transfer, high-performance catalysts for oxygen reduction and evolution, and novel structural flexibility. The composite film demonstrates excellent oxygen reduction/evolution reaction catalytic activities with low Tafel slopes (50 mV dec(-1) for oxygen reduction reaction; 92 mV dec(-1) for oxygen evolution reaction). Without any additional current collector, gas diffusion layer, or binder, the obtained bifunctional film performs as an all-in-one air electrode in a Zn-air battery. A 50-cm-long cable-shaped Zn-air battery based on such a film air electrode exhibits high operating potentials (approximate to 1.2 V at 0.25 mA cm(-2)), low charging-discharging overpotentials (approximate to 0.7 V), and stable cycling performance. Moreover, the flexible cable Zn-air batteries show excellent stability under different deformation conditions. The proposed concept of constructing scalable, all-in-one, freestanding, and flexible air electrodes would pave the way to develop next-generation wearable and portable energy-storage devices.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available