Urea Chelation of I + for High-Voltage Aqueous Zinc–Iodine Batteries
City University of Hong Kong · Beijing Institute of Technology · +3 more institutions
Abstract
The multielectron conversion electrochemistry of I–/I0/I+ enables high specific capacity and voltage in zinc–iodine batteries. Unfortunately, the I+ ions are thermodynamically unstable and are highly susceptible to hydrolysis. Current endeavors primarily focus on exploring interhalogen chemistry to activate the I0/I+ couple. However, the practical working voltage is below the theoretical level. In this study, the I0/I+ redox couple is fully activated, and I+ is efficiently stabilized by a chelation agent of cost-effective urea in the conventional aqueous electrolyte. A record-high plateau voltage of 1.8 V vs Zn/Zn2+ has been realized. Theoretical calculations combined with spectroscopy studies and…
Citation impact
- FWCI
- 44.39
- Percentile
- 100%
- References
- 47
Authors
9Topics & keywords
- Aqueous solution
- Chemistry
- Electrochemistry
- Electrolyte
- Disproportionation
- Inorganic chemistry
- Urea
- Chelation
- Clean water and sanitation