Asymmetric tin–vanadium redox electrolyte for hybrid energy storage with nanoporous carbon electrodes
| Autor: | Benjamin Krüner, Marco Zeiger, Volker Presser, Aura Tolosa, Nicolas Jäckel, Juhan Lee, Daekyu Kim, Simon Fleischmann |
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| Rok vydání: | 2017 |
| Předmět: |
Renewable Energy
Sustainability and the Environment Tin dioxide Inorganic chemistry Energy Engineering and Power Technology chemistry.chemical_element Vanadium 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Redox Reference electrode Energy storage 0104 chemical sciences chemistry.chemical_compound Fuel Technology chemistry Electrode 0210 nano-technology Tin |
| Zdroj: | Sustainable Energy & Fuels. 1:299-307 |
| ISSN: | 2398-4902 |
| Popis: | In recent decades, redox-active electrolytes have been applied in stationary energy storage systems, benefitting from Faradaic reactions of the electrolyte instead of the electrode material. One of the challenging tasks is to balance the redox activities between the negative and positive electrode. As a possible solution, a mixed electrolyte with vanadyl and tin sulfate was previously suggested; however, a low power performance is a great challenge to be overcome. Here, we found that the origin of the poor power performance in the mixture electrolyte system (vanadium complex and tin solution) is the reduction of the pore volume at the positive electrode via irreversible tin dioxide formation. To prevent the latter, we introduce a hybrid energy storage system exhibiting both battery-like and supercapacitor-like features via asymmetric redox electrolytes at the microporous activated carbon electrodes; SnF2 solution as anolyte and VOSO4 as catholyte. By employing an anion exchange membrane, the irreversible SnO2 formation at the positive electrode is effectively suppressed; thus, an asymmetric 1 M SnF2|3 M VOSO4 system provides a high maximum specific power (3.8 kW kg−1 or 1.5 kW L−1), while still exhibiting a high maximum specific energy up to 58.4 W h kg−1 (23.4 W h L−1) and a high cycling stability over 6500 cycles. |
| Databáze: | OpenAIRE |
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