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Issue 5, 2020
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Self-supporting N-rich Cu2Se/C nanowires for highly reversible, long-life potassium-ion storage

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Abstract

Currently, the search for excellent anode materials for potassium-ion storage is an important research direction. Transition metal selenide has potential application value in alkali metal-ion batteries because of its high theoretical capacity. However, due to its poor conductivity, slow insertion/extraction kinetics, and volume expansion, obtaining stable cycling performance remains challenging. In this paper, we report the design of self-supporting N-rich Cu2Se/C nanowires for use as a binder-free potassium-ion battery (PIB) electrode, which exhibits prolonged cycling life and good rate capacity. Because of the stable three-dimensional (3D) flexible structure, faster reaction kinetics, and high conductance of the as-synthesized nanowires, an excellent ultralong potassium-ion storage stability of ∼190 mA h g−1 is achieved over 200 cycles at a current density of 0.1 A g−1. In addition, a great rate capability is achieved (181 mA h g−1 at 0.1 A g−1vs. 104 mA h g−1 at 2.0 A g−1) due to partial pseudocapacitive behavior. The N-rich Cu2Se/C electrode also exhibits a stable capacity of 78 mA h g−1 over 1200 cycles when the current density is as high as 2 A g−1. We are the first to achieve such great performance in Cu–Se–C-based materials, and our work also provides a way to construct advanced transition metal selenide anodes for energy-storage devices.

Graphical abstract: Self-supporting N-rich Cu2Se/C nanowires for highly reversible, long-life potassium-ion storage

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Supplementary files

Article information


Submitted
31 Jan 2020
Accepted
10 Mar 2020
First published
10 Mar 2020

Sustainable Energy Fuels, 2020,4, 2453-2461
Article type
Paper

Self-supporting N-rich Cu2Se/C nanowires for highly reversible, long-life potassium-ion storage

X. Zhu, J. Gao, J. Li, G. Hu, J. Li, G. Zhang and B. Xiang, Sustainable Energy Fuels, 2020, 4, 2453
DOI: 10.1039/D0SE00160K

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