Development of polyoxometalate which acts as a proton-conducting solid electrolyte

2014 Fiscal Year Final Research Report

• Project/Area Number: 24550086
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Inorganic chemistry
• Research Institution: Chubu University
• Principal Investigator: ISHIKAWA Eri 中部大学, 工学部, 准教授 (90323831)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: ポリ酸 / プロトン伝導性 / 希土類金属

Outline of Final Research Achievements

We evaluated the electrical conductivity of Na3[PMo9O31(H2O)3]13H2O (PMo9) mixed with LaCl3 7H2O (La) by measuring its impedance. PMo9 exhibits conductivity through proton transport along a channel constructed by the oxygen atoms of anion and crystal water. It shows highest conductivity, 1.3×10-3 S　cm-1, at 50 °C. However, the conductivity decreases to 6.2×10-6 S cm-1 at 100 °C due to structural changes of anion. By mixing La into PMo9, we observed a significant enhancement at high temperatures. The conductivity of the mixture, PMo9:La = 9:1, was 1.0×10-3 S cm-1 at 100 °C. Based on TG-DTA and IR spectra, it was indicated that the existence of La in the PMo9 sample led to the improvement of PMo9 thermal stability by suppressing the release of crystal water. A similar effect was confirmed in the conductivity of [PMo12O36(OH)4{La(H2O)4}4]Br5 16H2O (PMo12La4). The conductivity of the PMo12La4:La = 9:1 mixture was 3.3 × 10-4 S cm-1 at 100 °C (3.8×10-8 S cm-11 for PMo12La4).

Free Research Field

無機化学