Issue 3, 2021

A general strategy for embedding ultrasmall CoMx nanocrystals (M = S, O, Se, and Te) in hierarchical porous carbon nanofibers for high-performance potassium storage

Abstract

Closely integrated transition-metal-based compounds/carbon nanoarchitectures are one of the most promising anode materials for large-scale energy storage applications because of the superior structural stability and the outstanding synergistic effect from the efficient combination of the two components. Herein, a versatile strategy is demonstrated for fabricating hierarchical porous carbon nanofibers (HCFs) with closely coupled Co-based ultrafine nanoparticles and a carbon matrix. The spatially restricted reactions of the synthetic method can not only prevent the agglomeration of the nanoparticles, but also provide extremely tight coupling interaction between CoMx (M = S, O, Se, and Te) nanoparticles and conductive carbon nanofibers. As a proof of concept, the as-fabricated CoS2@HCFs show high reversible capacity, excellent rate property, and ultralong cycling life when evaluated as an anode material for potassium-ion batteries (PIBs). Even after 1000 cycles, the charge capacity can be retained at 268 mA h gāˆ’1 at an elevated current rate of 500 mA gāˆ’1, one of the highest reported performances for Co-based anode materials in PIBs. This work emphasizes the importance of designing and manufacturing highly functionally coupled hybrid materials for improved energy storage implementation.

Graphical abstract: A general strategy for embedding ultrasmall CoMx nanocrystals (M = S, O, Se, and Te) in hierarchical porous carbon nanofibers for high-performance potassium storage

Supplementary files

Article information

Article type
Communication
Submitted
18 Nov 2020
Accepted
20 Dec 2020
First published
22 Dec 2020

J. Mater. Chem. A, 2021,9, 1487-1494

A general strategy for embedding ultrasmall CoMx nanocrystals (M = S, O, Se, and Te) in hierarchical porous carbon nanofibers for high-performance potassium storage

C. Lai, Z. Zhang, Y. Xu, J. Liao, Z. Xu, Z. Yi, J. Xu, J. Bao and X. Zhou, J. Mater. Chem. A, 2021, 9, 1487 DOI: 10.1039/D0TA11273A

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