PEMFC (Polymer Electrolyte Membrane Fuel Cell) is widely considered as an energy conversion system from the chemical energy of hydrogen to electric energy. But, hydrogen fuel obtained from hydrocarbons has trace amount of carbon monoxide which is a potential poison for platinum electrode
at the cell operating temperature ∼100 °C and it becomes a huddle for the general usage of PEMFC. On the other hand PAFC (Phosphoric Acid Fuel Cell) operates at a higher temperature and the platinum electrode oxidizes carbon monoxide poison while there is a leakage problem of the liquid
phase. To combine the advantages of two fuel cells, the electrolyte systems of phosphoric acid supported silica on ceramics are recently being tested. In this study, we investigated the nm pore rice husk silica as a support for phosphoric acid and tested the electric conductivity of the silica
plate and the characteristics of a prototype fuel cell H2|Pt|H3PO4/RHS|Pt|O2 at 100–200 °C. The conductivity of H3PO4/RHS was 8 mS cm −1 above 175 °C under 200 torr H2O. In the fuel
cell, the apparent conductance of the electrolyte from I−V characteristics was 2.45 mS/cm at 160 °C under 1 atm H2 and air at present.
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