Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 4, Pages 1638-1646Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta11029h
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Funding
- EPSRC Multiscale Tuning of Interfaces and Surfaces for Energy Applications consortium
- School of Chemistry, University of Edinburgh
- University of Chicago/University of Edinburgh
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Electrical double layer capacitors (EDLCs) featuring low-cost and solution-processable electrode materials have attracted significant research interest for their green and economical applications in energy harvesting and storage devices. Here, we demonstrate a novel synthetic route for films of an underexplored 3-D hexagonal bismuth chalcohalide, Bi13S18I2, and investigate its potential as the active electrode material in EDLC-type supercapacitors. The synthetic procedure has been optimised and comprises the lowest annealing temperature (150 degrees C) and the shortest processing time (1 h) currently reported. When integrated in a symmetrical EDLC with an aqueous NaClO4 electrolyte, the Bi13S18I2-based device achieves a remarkable areal capacitance of 210.68 mF cm(-2) with 99.7% capacitance retention after 5000 cycles. Both the Bi13S18I2 powder and thin-film electrodes have been characterized through XRD, XPS, Raman spectroscopy, and SEM. The superior stability, low-cost, and facile synthesis of Bi13S18I2 proves its promising potential for supercapacitor applications.
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