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Using a Dynamic Inhibition Concept to Achieve Content‐Controllable Synthesis of N‐Coordinated Cu Atoms as Reversible Active Site toward Super Li‐Ion Capacitors
Author(s) -
Xue Yunyan,
Li Yifan,
Luo Guanwei,
Shi Ke,
Liu Enhao,
Zhou Jisheng
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202002644
Subject(s) - materials science , polyacrylonitrile , anode , carbon fibers , lithium (medication) , carbon nanofiber , ion , chemical engineering , energy storage , electrospinning , capacitor , nanotechnology , electrode , composite material , carbon nanotube , chemistry , polymer , organic chemistry , medicine , power (physics) , physics , quantum mechanics , voltage , composite number , engineering , endocrinology
Carbon‐supported single atomic metals (SAMs) have attracted great interest in energy research. However, it is still a great challenge to control the content of SAMs in carbon. In this work, a dynamic inhibition strategy is proposed to achieve content‐controllable synthesis of Cu atoms loaded in carbon nanofibers (CNFs) using polyacrylonitrile (PAN) and Cu(NO 3 ) 2 as precursors by electrospinning. Interestingly, N‐anchoring sites in PAN‐derived carbon matrix are dynamically increased to inhibit the aggregation of Cu atoms. Therefore, Cu atom content can be linearly controlled by adjusting the ratio of Cu(NO 3 ) 2 /PAN, and a high mass content of 8.57 wt% can be achieved despite a low surface area of only 10 m 2 g −1 for Cu‐doped CNFs. Atomic Cu is stabilized by N to form CuN 3 coordination. More interestingly, N‐coordinated Cu atoms can not only improve the lithium‐ion diffusion kinetics in the CNFs, but also act as reversible Li storage sites. Therefore, Cu‐doped CNFs exhibit excellent rate and cycling performance for Li‐ion storage. Moreover, lithium‐ion capacitors, assembled by Cu‐doped CNFs as anode materials, can deliver high energy density (183.2 Wh kg −1 ) and high power density (11.0 kW kg −1 ). This concept opens up unique horizons for the design of SAMs toward new applications in energy storage.