Modulating the p-band center of carbon nanofibers derived from Co spin state as anode for high-power sodium storage

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外文摘要：Carbon nanofibers(CNFs)have received extensive and in-depth studied as anodes for sodium-ion bat-teries(SIBs),and yet their initial Coulombic efficiency and rate capability remain enormous challenge at practical level.Herein,CNFs anchored with cobalt nanocluster(CNFs-Co)were prepared using chemical vapor deposition and thermal reduction methods.The as-prepared CNFs-Co shows a high initial Coulom-bic efficiency of 91％and a high specific discharge capacity of 246 mAh/g at 0.1 A/g after 200 cycles as anode for SIBs.Meanwhile,the CNFs-Co anode still delivers a high cycling stability with 108 mAh/g after 1000 cycles at 10 A/g.These excellent electrochemical properties could be attributed to the involved spin state Co,which endows CNFs with large interplanar spacing(0.39 nm)and abundant vacancy defects.Im-portantly,the spin state Co downshifts the p-band center of carbon and strengthens the Na+adsorption energy from-2.33 eV to-2.64 eV based on density functional theory calculation.This novel strategy of modulating the carbon electronic structure by the spin state of magnetic metals provides a reference for the development of high-performance carbon-based anode materials.

外文关键词：

Carbon nanofibersChemical vapor depositionSpin statep-band centerSodium-ion battery

作者：

Zhijia Zhang、Yuwen Zhao、Yanhao Wei、Mengmeng Zhang、Chunsheng Li、Yan Sun、Jianmin Ma、Yong Jiang

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作者单位：

School of Materials Science and Engineering,State Key Laboratory of Separation Membrane and Membrane Processes,Tiangong University,Tianjin 300387,China

School of Electronic and Information Engineering,Institute of Quantum Materials and Devices,Tiangong University,Tianjin 300387,China

School of Chemistry and Life Sciences,Suzhou University of Science and Technology,Suzhou 215009,China

Key Laboratory of Advanced Electrode Materials for Novel Solar Cells for Petroleum and Chemical Industry of China,Suzhou University of Science and Technology,Suzhou 215009,China

School of Chemistry,Tiangong University,Tianjin 300387,China

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基金：

国家自然科学基金国家自然科学基金

项目编号：

5227101152102291

出版年：

2024

DOI：

10.1016/j.cclet.2023.109106

中国化学快报(英文版)

中国化学会

中国化学快报(英文版)

CSTPCD

影响因子：0.771

ISSN：1001-8417

年,卷(期)：2024.35(1)

参考文献量31