Influence of Zn2+ and Sb5+ co-substitution for Sn4+ on crystal structure and electrical conductivity of SnP2O7 electrolyte

Ogawa H. ¹Takahashi S. ²Moriyama T. ³Nishimoto K. ⁴Uchiyama K. ⁵Kagomiya I.⁶

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作者信息

1. Nagoya Industrial Science Research Institute (NISRI)
2. Department of Mechanical Engineering National Institute of Technology Fukui College
3. Electronic Mechanical Engineering Department National Institute of Technology Toba College
4. Steering Production Engineering Department JTEKT Corporation
5. Department of Creative Engineering National Institute of Technology Tsuruoka College
6. Department of Life Science and Applied Chemistry Nagoya Institute of Technology
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Abstract

In order to investigate the effects of the Zn and Sb cosubstitution for Sn on the crystal structure and electrical conductivity of SnP2O7, Sn1?x(Zn2/3Sb1/3)xP2O7 compounds were synthesized in this study. The crystal structure refinement results show the solid solution limit of the Sn1?x(Zn2/3Sb1/3)xP2O7 compounds to be x = 0.15. The electrical conductivity of the compounds was enhanced depending on the level of the composition x. The highest value of 2.2 × 10?2 S cm?1 was obtained for x = 0.15, at 250 °C. It was suggested that the interstitial proton of the Sn1?x(Zn2/3Sb1/3)xP2O7 lattice was introduced by the formation of oxygen vacancies that originated from the cosubstitution of Zn and Sb for Sn. It was confirmed that the introduction of the interstitial proton significantly enhanced the electrical conductivity of the Sn1?x(Zn2/3Sb1/3)xP2O7 compounds. Thus, the Sn1?x(Zn2/3Sb1/3)xP2O7 compounds can be a promising candidate electrolyte with proton conducting at intermediate operating temperatures.

Key words

Intermediate temperature Solid oxide fuel cells/Proton conductor/SnP2O7/Zn and Sb co-substitution

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出版年

2022

Journal of Alloys and Compounds

EISCI

ISSN：0925-8388

被引量1

参考文献量41

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