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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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
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container_issue 16
container_start_page 8922
container_title Nanoscale
container_volume 12
creator Yang, Cheng
Li, Yuzhu
Zhang, Binbin
Lian, Yuebin
Ma, Yong
Zhao, Xiaohui
Zeng, Xiangqiong
Li, Jiusheng
Deng, Zhao
Ye, Jing
Wu, Wenbin
Peng, Yang
description 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.
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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. 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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. 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