Analysis of H+ behavior in acid-dense structures in solids and development of humidity-independent H+ conducting membranes

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K14455
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 27020:Chemical reaction and process system engineering-related
• Research Institution: Kyoto University
• Principal Investigator: Ogawa Takaya 京都大学, エネルギー科学研究科, 准教授 (90748550)
• Project Period (FY): 2021-04-01 – 2023-03-31
• Keywords: プロトン伝導

Outline of Final Research Achievements

It was found that inorganic particles, Acac-Zr, can fill the porous substrate at about 50 wt%. Furthermore, Acac-Zr was converted to ZrPi, ZrHEDP, and ZrATMP by reacting it with phosphoric acid and the hydroxyethylidinediphosphoric acid and aminotris(methylenephosphonic acid), respectively. The weight ratio of ZrPi, ZrHEDP, and ZrATMP kept around 50wt%. All of them showed proton conductivity on the order of 1 mS/cm at 80 °C and 95% RH, and the film converted to ZrHEDP showed 6.3 mS/cm.

Free Research Field

物理化学

Academic Significance and Societal Importance of the Research Achievements

本膜は湿度依存性の低いプロトン伝導性膜を開発をする上で重要な技術の確立につながった。そして後からホスホン酸とAcac-Zrを反応させて変換するために、ホスホン酸に機能性分子を修飾し、プロトン伝導膜に限らず、任意の機能性分子を高密度に持ったフレキシブルな薄膜に成功したと言える。上述の層分離構造も、孤立した無機粒子が減る、すなわち無機粒子の特性を十分に発揮する上で有用であると言える。