Fabrication of Proton conductors in Intermediate temperature using Corona DIscharge

2014 Fiscal Year Final Research Report

• Project/Area Number: 25630270
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Inorganic materials/Physical properties
• Research Institution: Hokkaido University
• Principal Investigator: NISHII Junji 北海道大学, 電子科学研究所, 教授 (60357697)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 燃料電池 / プロトン伝導体 / ガラス

Outline of Final Research Achievements

Corona discharge treatment was used for the proton injection to oxide glasses. A highly durable Na2O-Nb2O5-P2O5 glass was fabricated using a melt quenching method. The glass block was cut and polished to a 0.5 mm thickness plate, which was treated with a corona plasma in hydrogen atmosphere at 400℃. The color of the treated area changed gradually, and passed completely through to the cathode side. The measurements of EDS and infrared absorption spectra revealed that approximately 50% of sodium ion was replaced to proton. However, other 50% remained in the glass matrix, which might be due to the electron conduction caused by the reduction of Nb5+ to Nb4+. Therefore, the glass composition based on the cations with high stability against the reduction must be developed for the proton conductors.

Free Research Field

無機材料