電極反應動力學燃料電池(文件)
【正文】 sk for a current that exceeds the exchange current, the job is much harder. We have to drive the system to deliver charge at the required rate, and we can only do that by applying a significant overpotential. ? From this perspective, we see that the exchange current is a measure of any system39。 . The cathodic and anodic activation energies are Towards a Sustainable Energy Future ? Where α, the transfer coefficient Towards a Sustainable Energy Future Towards a Sustainable Energy Future Standard Rate Constant ? It simply is a measure of the kiic facility of a redox couple. ? A system with a large k0 will achieve equilibrium on a short time scale, but a system with small k0 will be sluggish. ? The largest measured standard rate constants are in the range of 1 to 10 cm/s, and are associated with particularly simple electrontransfer processes. – Molecular rearrangement upon electron transfer or multistep process can be very sluggish Towards a Sustainable Energy Future The Transfer Coefficient In most systems a turns out to lie between and , and it can usually be approximated by in the absence of actual measurements. Towards a Sustainable Energy Future The transfer coefficient ? a should
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