Carbon dots confined nanosheets assembled NiCo2S4@CDs cross-stacked architecture for enhanced sodium ion storage

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外文摘要：Na batteries(SIBs)have been emerging as the most promising candidate for the next generation of sec-ondary batteries.However,the development of high-performance and cost-effective anode materials is urgently needed for the large-scale applications of SIBs.In this study,carbon dots confined bimetallic sulfide(NiCo2S4)architecture(NiCo2S4@CDs)was proposed and synthesized from assembling nanosheets into cross-stacked superstructure and the subsequent confinement of carbon dots.This novel decussated structure assembly from nanosheets is greatly beneficial to the structure stability of electrode material during the successive charge/discharge processes.Besides,the CDs based carbon conductive network can enhance the electrical conductivity for facilitating the easy transport of electron/Na.Benefitting from these advantages,NiCo2S4@CDs exhibits high-rate performance and an ultralong cycling life in SIBs.Specifically,the specific capacity of NiCo2S4@CDs can reach the discharge specific capacity as high as 568.9 mAh/g at 0.5 A/g,which can also maintain 302.7 mAh/g after 750 cycles at 5.0 A/g.Additionally,ex-situ characterization techniques such as ex-situ XRD and ex-situ XPS were employed to further explore the sodium storage mechanism of the NiCo2S4@CDs anode.

外文关键词：

Carbon dotsSodium ion batteriesNiCo2S4@CDsCross-stacked architectureEx-situ XRD and XPS

作者：

Binyang Qin、Mengqi Wang、Shimei Wu、Yining Li、Chilin Liu、Yufei Zhang、Haosen Fan

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作者单位：

School of Chemistry and Chemical Engineering,Guangzhou University,Guangzhou 510006,China

基金：

National Natural Science Foundation of ChinaNatural Science Foundation of Guangdong ProvinceScience and Technology Planning Project of Guangzhou

项目编号：

521012432023A1515012619202201010565

出版年：

2024

DOI：

10.1016/j.cclet.2023.108921

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(7)