A Study on Electric Conductivity of Phosphoric Acid Supported on Nano-Pore Rice Husk Silica in H2|Pt|H3PO4/RHS|Pt|O2 Fuel Cells

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Abstract:

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.

Keywords: ACTIVATION ENERGY; NANO-PORE; PAFC; PHOSPHORIC ACID; RICE HUSK SILICA

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2006.041

Publication date: November 1, 2006

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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