Oxygen Partial Pressure Dependence on Cell Voltage in Phosphoric Acid Fuel Cell

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Other Title
  • リン酸型燃料電池におけるセル電圧の酸素分圧依存性
  • リンサンガタ ネンリョウ デンチ ニ オケル セル デンアツ ノ サンソ ブンアツ イゾンセイ

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Abstract

<p>Cell voltage shifts with change in partial pressure of oxygen gas in a cathode chamber of a phosphoric acid fuel cell being operated at 197°C and ambient conditions were investigated. An experimental equation on influence of the average oxygen partial pressure on the cell voltage was obtained as shown, ΔV =(0.09+ bi) log(P(O2)/P(O2)*), whereΔV represents the amounts of shifted cell voltage by unit of (V), i is the generating current density (A/cm2), P(O2) is partial pressure (atm) of reacting oxygen gas, P(O2)* is standard partial pressure (atm) of reacting oxygen gas, and b is a constant for the cell. Validity of the equation was confirmed for pressurized operated cell, such as the pressure range up to 7 atm of the air. Also, an experimental equation on influence of gas utilization on the cell voltage shifts was derived as, ΔV=(0.09+bi) log {(P(O2)(ent)/P(O2)*)[2−(s/100)(1−P(O2)(ent)/P] /[2(1 + sP(O2)(ent)/100P] }, where ΔV represents an amount of the cell voltage change, P(O2)(ent) P) is a partial pressure (atm) of oxygen at the entrance of the cathode, s is a rate (%) of gas utilization at the cathode reaction, and P is the operating pressure (atm). Then, description of gas utilization rate is proved very important for presentation of cell performances.</p>

Journal

  • Electrochemistry

    Electrochemistry 67 (10), 979-984, 1999-10-05

    The Electrochemical Society of Japan

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