Two-dimensional flower-like cobalt-porphyrin MOF/rGO composite anodes for high-performance Li-ion batteries

•The abundant carboxyphenyl groups of TCPP-based MOF could not only serve as electrochemical active sites, but also inhibit electrode dissolution in organic electrolyte.•RGO was added into Co-TCPP MOFs as a stack-reducing reagent to synthesize the Co-TCPP MOF/rGO nanosheets composites. The introduct...

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Bibliographic Details
Published in:Journal of alloys and compounds 2021-11, Vol.881, p.160531, Article 160531
Main Authors: Han, Yang, Liu, Zhoujia, Zheng, Fenfen, Bai, Yixuan, Zhang, Zhiqian, Li, Xiaogang, Xiong, Weiwei, Zhang, Junhao, Yuan, Aihua
Format: Article
Language:English
Subjects:
Anodes
Cobalt
Cobalt-Porphyrin
Electric contacts
Electrical resistivity
Electrode materials
Electrodes
Electron transport
Graphene
Horizontal orientation
Lamellar structure
Lithium
Lithium-ion batteries
Metal-organic frameworks (MOFs)
Porphyrins
Rechargeable batteries
Reduced graphene oxide (rGO)
Stacking
Two dimensional flow
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Summary:•The abundant carboxyphenyl groups of TCPP-based MOF could not only serve as electrochemical active sites, but also inhibit electrode dissolution in organic electrolyte.•RGO was added into Co-TCPP MOFs as a stack-reducing reagent to synthesize the Co-TCPP MOF/rGO nanosheets composites. The introduction of rGO not only effectively reduced the stacking of MOF, but also formed a continuous conductive network entangled by graphene and MOF in favor of rapid electron transport.•By combining the advantages of Co-TCPP MOF nanosheets and reduced graphene oxide, the Co-TCPP MOF/rGO composite anode exhibits excellent lithium storage performance. The introduction of rGO not only reduces the stacking of MOF effectively, but also facilitates the formation of a continuous conductive network composed of entangled graphene and Co-TCPP MOF in favor of rapid electron transport. More importantly, the ultrathin lamellar structure of Co-TCPP MOF/rGO composite nanosheets could expose more active sites, reduce the diffusion distance of Li+ to the internal electroactive sites, and improve the overall electrical conductivity of the electrode due to the sufficient contact with carbon. [Display omitted] In this study, a novel flower-like Co-TCPP MOF/rGO composite has been successfully synthesized by combining cobalt meso-tetrakis(4-carboxyphenyl) porphyrin (Co-TCPP MOF) and reduced graphene oxide (rGO) via a simple one-pot solvothermal method. The introduction of rGO not only reduces the stacking of MOF effectively, but also facilitates the formation of a continuous conductive network composed of entangled graphene and Co-TCPP MOF in favor of rapid electron transport. More importantly, the ultrathin lamellar structure of Co-TCPP MOF/rGO composite nanosheets could expose more active sites, reduce the diffusion distance of Li+ to the internal electroactive sites, and improve the overall electrical conductivity of the electrode due to their sufficient contact with carbon. When evaluated as anode materials for lithium-ion batteries, the flower-like Co-TCPP MOF/(15 wt%)rGO composite electrode delivers a specific capacity of 1050 mAh g−1 at 100 mA g−1 after 100 cycles. A specific capacity of 650 mAh g−1 can be remained after 300 cycles even at 1000 mA g−1. The superior performance of the Co-TCPP MOF/(15 wt%)rGO composite electrode could be attributed to the introduction of rGO, which prevents the stacking growth of Co-TCPP MOF crystals along the horizontal direction and improves the electr
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2021.160531