電極反應(yīng)動(dòng)力學(xué)燃料電池(參考版)
2025-05-06 18:43本頁(yè)面
【正文】 hence the total current curve merges with that for ic. At large positive overpotentials, the cathodic ponent is negligible, and the total current is essentially the same as ia. ? In going either direction from Eeq, the magnitude of the current rises rapidly, because the exponential factors dominate behavior ? At extreme overpotential, the current levels off. the current is limited by mass transfer rather than heterogeneous kiics. Towards a Sustainable Energy Future Approximate Forms of the iη Equation (1)No MassTransfer Effects Towards a Sustainable Energy Future Towards a Sustainable Energy Future Towards a Sustainable Energy Future ? The exchange current can be viewed as a kind of idle current for charge exchange across the interface. If we want to draw a current that is only a small fraction of this bidirectional idle current, then only a tiny overpotential will be required to extract it. ? Even at equilibrium, the system is delivering charge across the interface at rates much greater than we require. The role of the slight overpotential is to unbalance the rates in the two directions to a small degree so that one of them predominates. ? On the other hand, if we ask for a current that ex
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