Nitrogen-doped carbon fibers embedding CoO nanoframes towards wearable energy storage

As continuous consumption of the world's lithium reserves is causing concern, alternative energy storage solutions based on earth-abundant elements, such as sodium-ion batteries and zinc-air batteries, have been attracting increasing attention. Herein, nanoframes of CoO x are encapsulated into...

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Bibliographic Details
Published in:Nanoscale 2020-04, Vol.12 (16), p.8922-8933
Main Authors: Yang, Cheng, Li, Yuzhu, Zhang, Binbin, Lian, Yuebin, Ma, Yong, Zhao, Xiaohui, Zeng, Xiangqiong, Li, Jiusheng, Deng, Zhao, Ye, Jing, Wu, Wenbin, Peng, Yang
Format: Article
Language:English
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Summary:As continuous consumption of the world's lithium reserves is causing concern, alternative energy storage solutions based on earth-abundant elements, such as sodium-ion batteries and zinc-air batteries, have been attracting increasing attention. Herein, nanoframes of CoO x are encapsulated into carbonized microporous fibers by electrospinning zeolitic imidazolate frameworks to impart both a sodium-hosting capability and catalytic activities for reversible oxygen conversion. The ultrahigh rate performance of sodium-ion batteries up to 20 A g −1 and ultrastable cycling over 6000 cycles are attributed to a dual-buffering effect from the framework structure of CoO x and the confinement of carbon fibers that effectively accommodates cyclic volume fluctuation. Both in situ Raman and ex situ microscopic analyses unveil the reversible conversion of CoO x during the sodiation/desodiation process. The excellent ORR activity, superior to that of commercial Pt/C, is mainly ascribed to the abundant Co-N-C species and the full exposure of active sites on the microporous framework structure. Flexible and rechargeable sodium-ion full batteries and zinc-air batteries are further demonstrated with great energy efficiency and cycling stability, as well as mechanical deformability. Nitrogen-doped carbon fibers embedding CoO x nanoframes were fabricated by electrospinning ZIF-67, serving as freestanding electrodes for sodium-ion batteries and zinc-air batteries with great electrochemical properties and mechanical deformability.
ISSN:2040-3364
2040-3372
DOI:10.1039/d0nr00582g