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北京石油化工学院2026年研究生招生接收调剂公告
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syb

银虫 (小有名气)

[交流] 请教:旋转圆盘电极中I~rpm^(1/2)曲线偏离直线说明什么?

旋转圆盘电极中,液相传质速度控制的电流与转速的1/2次方成正比关系,那么在I vs. w^(1/2)图形中应该是一条直线。
如果在高转速下,比如4900rpm,3600rpm,I-V曲线基本重合。也就是说,在I vs. w^(1/2)图形中,曲线向横坐标方向偏离,这种情况说明什么问题呢?
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syb

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"it is probably that electrochemical reaction does not control by mass transfer at high rate, the reaction was controlled by electron transfer at electrode surface "

If the reaction is controlled by electron transfer as you said, the I~V relation must obey the Tafel formula. Obscurely, I saw a flat current in the I vs. E curve, which was not follow the Tafel relation. Now, what dose this "diffusion current" mean?
3楼2008-01-23 22:57:13
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xmuxiaoyu

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it is probably that electrochemical reaction does not control by mass transfer at high rate, the reaction was controlled by electron transfer at electrode surface
2楼2008-01-23 21:55:55
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xmuxiaoyu

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o, sorry. I don't n know in this situation
4楼2008-01-23 23:13:34
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