CuHCF as an electrode material in an aqueous dual-ion Al3+/K+ ion battery
| Autor: | Alexander Holland, Andrew Cruden, Richard G.A. Wills, Harriet Kimpton |
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| Rok vydání: | 2018 |
| Předmět: |
Battery (electricity)
Electrode material Aqueous solution Chemistry Inorganic chemistry 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Ion Electrode Degradation (geology) 0210 nano-technology Faraday efficiency |
| Zdroj: | Energy Procedia. 151:69-73 |
| ISSN: | 1876-6102 |
| Popis: | Copper-hexacyanoferrate (CuHCF) is capable of 28000 cycles in 1 mol dm-3 AlCl3 in a 3-electrode cell, while performance improves with the addition of K+. However, CuHCF synthesised by co-precipitation is in a partially oxidised state, resulting in an effective state-of-charge (SoC) of 90%. Chemical reduction is possible by soaking electrodes in 10 mmol dm-3 Na2S2O3 to produce an electrode at 0% SoC, while chemical oxidation in 100 mmol dm-3 KMnO4 is possible in order to produce electrodes at 100% SoC. Despite this, a full cell constisting of a TiO2 negative electrode, CuHCF positive electrode and 1 mol dm-3 AlCl3/1 mol dm-3 KCl, allows ca. 1100 cycles due to the premature degradation of CuHCF. This is due to the low coulombic efficiency (CE) of TiO2, which results in consistent overcharging of CuHCF and the likely loss of Fe3+ to the electrolyte. |
| Databáze: | OpenAIRE |
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