Citation: WANG Hong-Tao, SUN Lin, CHEN Ji-Tang, LUO Chun-Hua. Ionic Conduction in Sn_0.9Mg_0.1P₂O₇ at Intermediate Temperatures[J]. Acta Physico-Chimica Sinica doi: 10.3866/PKU.WHXB201210101 shu

Ionic Conduction in Sn_0.9Mg_0.1P₂O₇ at Intermediate Temperatures

1.
College of Chemistry and Chemical Engineering, Fuyang Teachers College, Fuyang 236041, Anhui Province, P. R. China

Received Date: 16 July 2012
Available Online: 10 October 2012
Fund Project: 国家自然科学基金(50903018)资助项目 (50903018)

Sn_0.9Mg_0.1P₂O₇ was synthesized in a solid state reaction and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The XRD pattern indicated that the sample exhibited a single cubic phase. The protonic and oxide-ionic conduction were investigated using various electrochemical methods including AC impedance spectroscopy and gas concentration cells at intermediate temperatures (323-523 K). The highest conductivity observed was 5.04×10^-2 S·cm^-1 in a wet H₂ atmosphere at 423 K. The ionic, protonic, oxide-ionic, and electronic transport numbers (N_t) were 0.95-1.00, 0.84-0.96, 0.04-0.10, 0.00-0.05, respectively, in a wet hydrogen atmosphere. The results indicate that Sn_0.9Mg_0.1P₂O₇ is an almost pure ionic conductor, has dominant protonic conduction, some limited oxide-ionic conduction, but little electronic conduction. A H₂/air fuel cell using Sn_0.9Mg_0.1P₂O₇ as the electrolyte (thickness: 1.5 mm) generated maximum power densities of 18.7 mW·cm^-2 at 398 K, 27.7 mW·cm^-2 at 423 K, and 33.9 mW·cm^-2 at 448 K.
- Sn_0.9Mg_0.1P₂O₇,
- Ionic conduction,
- Electrolyte,
- Conductivity,
- Concentration cell,
- Fuel cell
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沈阳化工大学材料科学与工程学院沈阳 110142

Ionic Conduction in Sn0.9Mg0.1P2O7 at Intermediate Temperatures

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Ionic Conduction in Sn_0.9Mg_0.1P₂O₇ at Intermediate Temperatures