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융용탄산염 연료전지의 운전변수가 단위전지 성능에 미치는 영향
The Effect of Operating Variables of MCFC on the Single Cell Performance
HWAHAK KONGHAK, June 1994, 32(3), 498-505(8), NONE
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Abstract
차세대 연료전지인 용융탄산염 연료전지의 운전조건을 확립하기 위하여 전극면적이 100㎠인 단위전지를 제작하여 운전변수와 단위전지 성능과의 관계를 살펴보았다. 제작된 단위전지는 1.13V의 개회로전압과 150mA/㎠의 전류밀도에서 0.9V이상의 전압을 얻었으며 수소이용율을 증가시킬 때 전지의 성능이 감소하였으나 산소이용율에 대해서는 거의 영향을 받지 않았다. Anode가스의 수소분압이 커질수록 전지의 성능이 증가하였고 cathode가스가 33% 산소, 67% 이산화탄소의 조성을 가질 때 최대의 성능을 보였다. 가습시의 전지성능은 Nernst 식에 의한 기전력의 손실 만큼 전압이 감소되었으며, oxygen gain은 개회로전압에서 50mV, 150mA/㎠의 전류밀도에서 90mV이었다. 또한 운전온도를 증가시킴에 따라 전지의 성능도 증가하였다.
To establish the operating conditions of molten carbonate fuel cells, the relationship between operating variables and the performance of the single cell with the active electrode area of 100㎠ was investigated. The single cell showed the open circuit voltage of 1.13V and the cell voltage over 0.9V at the current density of 150mA/㎠. The performance decreased with the increase of the hydrogen utilization, while the effect of the oxygen utilization turned out to be negligible. The performance increased proportionally to the hydrogen partial pressure of the anode gas, but the highest performance was obtained at the voltage loss estimated from the Nernst equation, and the oxygen gain was 50mV and 90mV at the condition of the open circuit voltage and at the current density of 150mA/㎠, respectively. The cell voltage at the given conditions tended to increase with the increase of the operating temperature, but the increasing rate became smaller above 650℃.
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