Ordered nano-structured mesoporous CMK-8 and other carbonaceous positive electrodes for rechargeable aluminum batteries
| Autor: | Purna Chandra Rath, Shi Xian Lu, Dominic Bresser, Jagabandhu Patra, Stefano Passerini, Ching Yuan Su, Jeng Kuei Chang, Chi Li |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
General Chemical Engineering chemistry.chemical_element 02 engineering and technology Electrolyte porous carbon electrodesIonic liquid electrolyte 010402 general chemistry Electrochemistry 01 natural sciences Industrial and Manufacturing Engineering Crystallinity X-ray photoelectron spectroscopy Environmental Chemistry General Chemistry crystallinityInterpenetrating open channels 021001 nanoscience & nanotechnology pore size effects 0104 chemical sciences chemistry Chemical engineering Electrode Cyclic voltammetry 0210 nano-technology Mesoporous material Carbon |
| Zdroj: | Chemical Engineering Journal. 417:129131 |
| ISSN: | 1385-8947 |
| Popis: | The chloroaluminate ion storage properties of various carbonaceous electrodes, namely soft carbon (SC), hard carbon (HC), activated carbon (AC), and ordered mesoporous carbon CMK-8, are investigated. The effects of carbon crystallinity, surface area, and pore size are systematically examined. Due to their non-ideal graphitic structures, the charge–discharge capacities of SC and HC electrodes are unfavorable for practical applications, although SC, with its relatively high crystallinity, outperforms HC. The high-surface-area AC and CMK-8 exhibit reversible capacities of 59.0 and 100.5 mAh g−1, respectively, at 300 mA g−1. Pore size and geometry play important roles in determining the electrochemical properties. The CMK-8 framework not only serves as an electronic conduction pathway but also provides interpenetrating three-dimensional open channels for electrolyte accessibility and complex AlCl4− anion transport. The charge storage mechanism of the CMK-8 electrode, confirmed by electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and cyclic voltammetry, has a capacitive contribution and a diffusion-controlled intercalation/deintercalation contribution. Based on this unique mechanism, great rate capability, and excellent cyclability of the CMK-8 electrode are demonstrated. |
| Databáze: | OpenAIRE |
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