ZnAl alloy and organosulfur hybrid energy storage for long term cyclability
File(s)
Accepted version
Author(s)
Type
Journal Article
Abstract
Multivalent metal ion capacitors are considered as an emerging hybrid energy storage devices to resolve a low energy density of electrochemical capacitors while preserving a high rate capability and long cyclability. Herein, we demonstrate unique hybrid energy storage devices configuring ZnAl alloy anodes with 4-aminophenyl trisulfide organosulfur organosulfur/reduced graphene oxide (SOS@rGO) composite cathodes for the improved cyclability and capacity. The fast and reversible conversion reaction of organosulfur for the chemically coupled SOS@rGO cathode was confirmed, while the alloying reaction of Zn anode with Al3+ was also revealed in hybrid electrolytes as demonstrated by in situ and ex situ spectroscopic characterizations. The resulting hybrid cells, configuring ZnAl alloy anodes with SOS@rGO composite cathodes, delivered the high capacity of 190 mAh g−1 at 200 mA g−1 and high-rate capacity of 100 mAh g−1 at 2000 mA g−1, respectively, at the electrolyte concentration of 1.2 mol L−1. Furthermore, a long-term cyclability of was confirmed achieving a low capacity fade rate of only 0.0109 % per cycle over 5720 cycles, along with a high Coulombic efficiency of 99.98 %. Therefore, this work establishes a foundation for the advancement of Al and sulfur hybrid energy storage devices with the high capacity and cyclic stability.
Date Issued
2025-05-15
Date Acceptance
2025-04-06
Citation
Chemical Engineering Journal, 2025, 512
ISSN
1385-8947
Publisher
Elsevier
Journal / Book Title
Chemical Engineering Journal
Volume
512
Copyright Statement
Copyright © 2025 Elsevier B.V. This is the author’s accepted manuscript made available under a CC-BY licence in accordance with Imperial’s Research Publications Open Access policy (www.imperial.ac.uk/oa-policy)
License URL
Publication Status
Published
Article Number
162412
Date Publish Online
2025-04-09