リン酸型燃料電池の起動・停止時のセル電圧低下について

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  • On the Voltage Drop of Phosphoric Acid Fuel Cell due to its On-Off Operation
  • リンサンガタ ネンリョウ デンチ ノ キドウ テイシジ ノ セル デンアツ テ

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It is well known that the voltage of phosphoric acid fuel cell drops due to its on-off operation. The experimental results show that the magnitude of voltage drop depends on the operating cell voltage, the amount of O2 residue in the cathode electrode and start-stop operating duration. The results of half cell and small sized cell test show that the catalyst sintering and flooding of catalyst layer have been promoted by on-off operation with high electrode potential and high temperature, result-ing the voltage drop of fuel cell. To suppress the voltage drop due to its on-off operation, it is necessary to insert the dumy resistance, to operate N2 purge and avoid air intrusion from exterior of the fuel cell. It is also effective to suppress the wetting speed of the catalyst layer with electrolyte by increasing its hydrophobicity.

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