In:
Small, Wiley, Vol. 14, No. 48 ( 2018-11)
Abstract:
As a promising energy‐storage device, rechargeable Zn‐air batteries have attracted considerable interests. Herein, a bifunctional oxygen electrode film prepared by adhering NiCo 2 O 4 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 (≈1.2 V at 0.25 mA cm −2 ), low charging–discharging overpotentials (≈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.
Type of Medium:
Online Resource
ISSN:
1613-6810
,
1613-6829
DOI:
10.1002/smll.201803409
Language:
English
Publisher:
Wiley
Publication Date:
2018
detail.hit.zdb_id:
2168935-0
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