Correlation between structure and oxidation behavior of carbon aerogels
| Autor: | Azadeh Seifi, Ahmad Reza Bahramian, Alireza Sharif |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Reaction mechanism
Materials science Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology chemistry.chemical_element Aerogel 02 engineering and technology Activation energy 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences 0104 chemical sciences Polymerization chemistry Chemical engineering Electrical and Electronic Engineering 0210 nano-technology Thermal analysis Carbon Pyrolysis |
| Zdroj: | Journal of Energy Storage. 7:195-203 |
| ISSN: | 2352-152X |
| DOI: | 10.1016/j.est.2016.07.003 |
| Popis: | In order to investigate the effect of microstructure on oxidation behavior of carbon aerogel, three samples with different pore structure were prepared. These carbon aerogel samples were synthesized via the novel method of sol-gel polymerization in solvent-saturated vapor atmosphere and the following pyrolysis step. The structural characteristics of the unreacted carbon aerogel and the overall rate of oxidation have determined using pore structure analysis methods and thermo-gravimetric analysis (TGA) under non-isothermal condition, respectively. It was found that the initial pore structure and the reaction condition have an important effect on the reaction pathway. The changes in apparent activation energy with the degree of conversion are presumably due to the changes in the oxidation control mechanisms with progress of the reaction and further reveal a multistep kinetic process. So, two different processes were suggested to control the global oxidation kinetics, their relative contribution being temperature and structure-dependent. The reported study may be relevant towards energy storage applications of carbon aerogel at high temperature where the pore structure plays a key role. |
| Databáze: | OpenAIRE |
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