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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

Using a Dynamic Inhibition Concept to Achieve Content‐Controllable Synthesis of N‐Coordinated Cu... 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(NO3)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(NO3)2/PAN, and a high mass content of 8.57 wt% can be achieved despite a low surface area of only 10 m2 g−1 for Cu‐doped CNFs. Atomic Cu is stabilized by N to form CuN3 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Energy Materials Wiley

Using a Dynamic Inhibition Concept to Achieve Content‐Controllable Synthesis of N‐Coordinated Cu Atoms as Reversible Active Site toward Super Li‐Ion Capacitors

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References (58)

Publisher
Wiley
Copyright
© 2020 Wiley‐VCH GmbH
ISSN
1614-6832
eISSN
1614-6840
DOI
10.1002/aenm.202002644
Publisher site
See Article on Publisher Site

Abstract

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(NO3)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(NO3)2/PAN, and a high mass content of 8.57 wt% can be achieved despite a low surface area of only 10 m2 g−1 for Cu‐doped CNFs. Atomic Cu is stabilized by N to form CuN3 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.

Journal

Advanced Energy Materials – Wiley

Published: Nov 1, 2020

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