Potassium-graphite intercalation compounds prepared from carbon materials of different heat-treatment temperature and their reaction with water vapor
✍ Scribed by Noboru Akuzawa; Takashi Seino; Atsushi Yugeta; Takeo Amemiya; Yoichi Takahashi
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- English
- Weight
- 602 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0008-6223
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✦ Synopsis
By means of the gravimetric technique, the reaction of potassium-graphite intercalation compounds (K-GICS) with water vapor has been investigated in relation to the heat-treatment temperature (H'IT) of pristine carbon materials. K-GICs with the saturated composition of KC& prepared from the material whose Hm = 1500°C was remarkably reactive as compared with other K-GICs from those of H?T = 1000, 2000 and 2600°C. Through the X-ray diffraction measurement, a resultant product with an apparent imposition of (K-GIC) . (H,O),., was found to be a mixture of KOH . H,O and KOH . 2H,O with a residue compound of K-GIC. Even if the residue was washed with water after the reaction, potassium still remained in the matrix; the amount varied in accordance with the m of the pristine material from 20% for 1000°C up to 40% for 2600°C. 'The washed residues give X-ray diffraction patterns different from those of the original materials. It was also found that KC,, reacts more rapidly with water vapor than KC, does, where the steep weight increase takes place in the initial stage of the reaction, followed by a characteristic weight loss not observed for KC+