A Novel Glass Membrane for Low Temperature H₂/O₂Fuel Cell Electrolytes

Abstract

Abstract A novel structure for an H 2 /O 2 fuel cell with a proton conducting glass electrolyte and a Pt/C catalyst was developed. The performance of the fuel cell, which was impregnated with a glass electrolyte and a gaseous hydrogen–oxygen feed at low temperature in a humidified atmosphere was significantly improved by introducing membrane electrode assemblies (MEAs) consisting of heteropolyacids (HPAs) (phosphotungstic acid, PWA and phosphomolybdic acid, PMA) doped with a P 2 O 5 ‐SiO 2 glass electrolyte. The HPAs containing porous glass electrolytes show promise for applications in low temperature H 2 /O 2 fuel cells. The electrochemical behaviour of these materials was studied by measuring the current–voltage profile from polarisation curves. A maximum power density of ≈ 35 mW cm –2 was obtained at 30 °C and 30% RH (relative humidity) using a PMA/PWA‐P 2 O 5 ‐SiO 2 glass electrolyte membrane. The impedance measurements displaying the total cell ohmic resistance for 12 h at 0.5 V were evaluated at 30 °C. The resistance value was 3.5 Ω for an operating time of 12 h. This MEA showed the best and the most stable performance for use in an H 2 /O 2 fuel cell.

Key findings

• ▸Maximum power density of ≈ 35 mW cm⁻² was obtained at 30 °C and 30% RH using a PMA/PWA-P2O5-SiO2 glass electrolyte membrane.
• ▸HPAs containing porous glass electrolytes show promise for applications in low-temperature H2/O2 fuel cells.
• ▸Electrochemical behavior of these materials was studied by measuring the current-voltage profile from polarization curves.

Keywords

Identifiers

DOI

10.1002/fuce.200700006

Journal

Fuel Cells

Year

2007