| Autor: |
Van H. Nguyen, Mototsugu Sakai, Yusuke Daiko, Atsunori Matsuda, Tetsuo Yazawa, Hiroyuki Muto |
| Rok vydání: |
2010 |
| Předmět: |
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| Zdroj: |
Solid State Ionics. 181:183-186 |
| ISSN: |
0167-2738 |
| Popis: |
A typical solid acid of CsHSO 4 and phosphotungstic acid (H 3 PW 12 O 40 6H 2 O: WPA6H 2 O) were mechanically milled, and non-humidified proton conductivity of the obtained composite was investigated. The 90CsHSO 4 10WPA (mol%) composite showed high proton conductivities of 10 − 2 –10 − 4 S/cm from 160 to 30 °C under dry nitrogen atmosphere, while the conductivity of pure CsHSO 4 dropped abruptly at around 145 °C due to the phase transition from superprotonic CsHSO 4 (I) phase to CsHSO 4 (II) phase. Differential scanning calorimetry (DSC), X-ray diffraction (XRD), and Fourier transform infrared (FT-IR) spectroscopy measurements were performed at various temperatures to study the phase transition behaviour as well as hydrogen bonding structure. The phase transition was not observed for the 90CsHSO 4 10WPA composite. FTIR measurements revealed that a peak for OH stretching shifted to a higher wavenumber with increasing temperature. The O–H•••O hydrogen bond distance was calculated from the OH band wavenumber. The proton conductivities in dry conditions were related to the bonding distance. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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