Journal
ACS NANO
Volume 16, Issue 2, Pages 3163-3172Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.1c10857
Keywords
graphdiyne; graphene; sandwiched carbonaceous architecture; anode; potassium-ion battery
Categories
Funding
- Beijing National Laboratory for Molecular Sciences [BNLMS-CXTD-202001]
- National Natural Science Foundation of China [52021006, 51720105003, 21790052, 21974004]
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In this study, a GDY/Gr/GDY sandwiched architecture was designed to improve the K-ion storage performance. Experimental results showed that the GDY/Gr/GDY electrode exhibited better capacity output and cyclic stability. In situ testing revealed the reversibility of the GDY/Gr/GDY electrode. A full-cell device demonstrated the potential of the GDY/Gr/GDY anode for K-ion batteries.
Graphdiyne (GDY) has been considered as an appealing anode candidate for K-ion storage since its triangular pore channel, alkyne-rich structure, and large interlayer spacing would endow it with abundant active sites and ideal diffusion paths for K-ions. Nevertheless, the low surface area and disordered structure of bulk GDY typically lead to unsatisfied K storage performance. Herein, we have designed a GDY/graphene/GDY (GDY/Gr/GDY) sandwiched architecture affording a high surface area and fine quality throughout a van der Waals epitaxy strategy. As tested in a half-cell configuration, the GDY/Gr/GDY electrode exhibits better capacity output, rate capability, and cyclic stability as compared to the bare GDY counterpart. In situ electrochemical impedance spectroscopy/Raman spectroscopy/transmission electron microscopy are further applied to probe the K-ion storage feature and disclose the favorable reversibility of GDY/Gr/GDY electrode during repeated potassiation/depotassiation. A full-cell device comprising a GDY/Gr/GDY anode and a potassium Prussian blue cathode enables a high cycling stability, demonstrative of the promising potential of the GDY/Gr/GDY anode for K-ion batteries.
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