Hybrid inorganic-organic proton conducting membranes for fuel cells and gas sensors

0096650 - ÚACH 2008 RIV GB eng J - Journal Article
Míka, M. - Paidar, M. - Klápště, Břetislav - Mašínová, M. - Bouzek, K. - Vondrák, Jiří
Hybrid inorganic-organic proton conducting membranes for fuel cells and gas sensors.
[Hybridní anorganicko . organické protonově vodivé membrány pro palivové články a plynové sensory.]
Journal of Physics and Chemistry of Solids. Roč. 68, 5-6 (2007), s. 775-779. ISSN 0022-3697. E-ISSN 1879-2553
R&D Projects: GA ČR GA106/04/1279
Institutional research plan: CEZ:AV0Z40320502
Keywords : electrochemical properties * amorphous materials
Subject RIV: CA - Inorganic Chemistry
Impact factor: 0.899, year: 2007

We developed new fast proton conducting membranes based on a hybrid inorganic-organic phosphosilicate polymer synthesized from othophosphoric acid, dichlorodimethylsi lane, and tetraethoxysilane. The membranes were amorphous, translucent, and flexible. A high concentration of -OH groups and short distances between them promoted fast proton conductivity in dry atmosphere at increased temperatures. The proton conductivity was measured using the electrochemical impedance spectroscopy. Its value increased with rising temperature following the Arrhenius dependence with the activation energy 20 kJ/mol. In dry conditions at 120 degrees C, the conductivity was 1.6S/m. The cell performance significantly improved with increasing temperature. We expect the application of our membrane in intermediate temperature fuel cells and gas sensors operating in dry conditions.

Vyvinuli jsme membrány s vysokou protonovou vodivostí na bázi hybridních polymerů syntetizovaných z orthofosforečné kyseliny, dichlorodimethylsilanu a detraethoxysilanu. Membrány byly amorfní, průsvitné a ohebné. V suchém stavu byla jejich měrná vodivost 1,65 S/m při 120 stních C. Byly zchopny činnosti v palivovém člnku H2 – O2 při eplotách 100 až 130 stupňů C. Byly dále testovány v sensorech s TiHx elektrodou pro detekci složení suchých plynů obsahujících H2 nebo O2 nad 100 stupňů C.
Permanent Link: http://hdl.handle.net/11104/0004456