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Journal of Inorganic Materials

Journal of Inorganic Materials >

2009 , Vol. 24 >Issue 6: 1197 - 1200

DOI: https://doi.org/10.3724/SP.J.1077.2009.01197

Research Paper

Modification of Ce(SO4)2 on Phosphosilicate Gels used as Proton Conductors

  • HU Lin-Na ,
  • HE Jun-Hua ,
  • PENG Hui-Fen ,
  • ZHANG Yue-Xing
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  • (1. School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China; 2. School of Material Science & Engineering, Hebei University of Technology, Tianjin 300130, China; 3. The 718th Research Institute, China Shipbuilding Industry Corporation, Handan 056027, China)

Received date: 2009-03-02

  Revised date: 2009-04-24

  Online published: 2010-04-22

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Abstract

Preparation of proton conductors with good chemical durability and high proton conductivity is prerequisite for increasing efficiency of medium temperature fuel cells. In this research, new type of proton conductors were synthesized by adding Ce(SO4)2 to the phosphosilicate gels through sol-gel process. The results prove that adding Ce(SO4)2 can apparently increase proton conductivity of the gels, which reaches the maximum conductivity with the Ce(SO4)2 content of 0.81%, i.e. σ100=1.25S/m, σ130=2.11S/m. These values are 70% higher than those without adding Ce(SO4)2. The proton conductivity of the gels will decrease by 20% in dry argon atmosphere, that is, σ100=1.06S/m, σ130=1.68S/m. Thermal analysis reveals that introduction of Ce(SO4)2 results in an increase in water-retention ability of the gels. Furthermore, NMR spectra indicate that there forms more PO43- isolated phosphate structure units containing no bridgeoxygen (Q0) and Q1 structure units containing one bridgeoxygen like Si—O—P and P—O—P in the Ce(SO4)2-containing gels. These structure units are favorable to proton transportation, which increase the proton conductivity of the gels.

Key words： proton conductors; sol-gel method; phosphosilicate gels; Ce(SO4)2

Cite this article

HU Lin-Na , HE Jun-Hua , PENG Hui-Fen , ZHANG Yue-Xing . Modification of Ce(SO4)2 on Phosphosilicate Gels used as Proton Conductors[J]. Journal of Inorganic Materials, 2009 , 24(6) : 1197 -1200 . DOI: 10.3724/SP.J.1077.2009.01197

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