On the cycling stability of biomass-derived carbons as electrodes in supercapacitors
| Autor: | Antonia Stoyanova, Boryana Karamanova, Ch. Girginov, M. Shipochka, Radostina Stoyanova |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Supercapacitor
Materials science Mechanical Engineering Composite number Metals and Alloys 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences X-ray photoelectron spectroscopy Chemical engineering Mechanics of Materials Electrode Materials Chemistry medicine Titration 0210 nano-technology Spectroscopy Activated carbon medicine.drug |
| Zdroj: | Journal of Alloys and Compounds. 803:882-890 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2019.06.334 |
| Popis: | The present work provides new insight into the long-term cycling stability of biomass-derived activated carbons as electrodes in symmetric supercapacitors on the basis of ex-situ and post-mortem spectroscopic and microscopic analyses. The physicochemical characterization of activated carbons is carried out by DTA/TG, XPS spectroscopy, SEM, AFM and BET analyses. The surface functional groups and pore size distribution are determined by Bohm titration method and Barett-Joyner-Halenda analysis, respectively. The supercapacitor performance of the composite electrodes is tested by charge/discharge galvanostatic experiments. To go inside into surface and bulk electrode changes during electrode cycling, the post-mortem XPS, SEM/EDS and AFM experiments are undertaken. It is found that activated carbon having higher content of acidic groups and narrow pore size distribution displays an impressive cycling stability in alkaline electrolyte solution. The observed changes in electrode morphology during cycling are discussed on the basis of electrode-electrolyte interaction. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect