Developing of solid state electrolytes for intermediate temperature fuel cells; Exploring of new materials using high-temperature alkali-proton substitution technique

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K14126
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Inorganic materials/Physical properties
• Research Institution: Tohoku University (2016); Osaka University (2015)
• Principal Investigator: Omata Takahisa 東北大学, 多元物質科学研究所, 教授 (80267640)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 燃料電池 / セラミックス / 新エネルギー / 先端機能デバイス

Outline of Final Research Achievements

We explored the proton conducting solid oxide crystals exhibiting high electrical conductivity at intermediate temperatures using electrochemical substitution of Na+ ions with protons at intermediate temperatures (APS). Although we have not been successful to obtain solid oxides exhibiting high proton conductivity, we have found out very interesting phenomenon in APS for Na3Zr2Si3PO12 (NASICON). While the crystal structure of NASICON was maintained up to the 50% substitution of Na+ ions with protons, it became amorphous above 50% substitution of Na+ ions with protons. This observation was explained in terms of the internal pressure introduced by the volume shrinkage during the substitution.

Free Research Field

無機材料科学