In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 10, No. 48 ( 2022), p. 25671-25682
Abstract:
Layered heterostructures have gained significant attention as potential platforms for energy storage because of their unique electronic and interfacial characteristics. Engineering heterojunctions in a rational, efficient, and effective manner is critical to well-defined battery systems. Herein, FePSe 3 –FeSe 2 heterojunctions uniformly dispersed in a Ketjen black carbon matrix (FePSe 3 –FeSe 2 /C) were prepared by a one-step phosphorization–selenization method. The conductive carbon matrix can prevent the aggregation of FePSe 3 –FeSe 2 hexagonal nanoplatelets. Moreover, theoretical calculations demonstrate that FePSe 3 –FeSe 2 heterostructures with a strong asymmetric electric field can facilitate K + intercalation. Notably, FePSe 3 –FeSe 2 /C with rich active sites would undergo negative fading, which results in a capacity increase upon cycling. As an anode for potassium ion batteries (PIBs), FePSe 3 –FeSe 2 /C can deliver high capacities of 352 mA h g −1 at 0.1 A g −1 after 100 cycles and 224 mA h g −1 at 1.0 A g −1 after 3700 cycles. The strategy of fabricating FePSe 3 –FeSe 2 heterojunctions can be extended to other metal phosphorus trichalcogenides to improve their performance in energy storage. Furthermore, the obtained results provide important insights into hetero-nanostructure design toward fast reaction kinetics for PIBs.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
2702232-8
detail.hit.zdb_id:
2696984-1
