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duan0718

木虫 (职业作家)

[求助] 电分析中的电子转移速率,怎么计算? 已有2人参与

扩散控制过程的电分析,能不能求算电子转移速率呢?
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yangguangming

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【答案】应助回帖

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duan0718: 金币+10, ★★★很有帮助 2014-10-15 22:55:14
先看pH与电位的关系,确定电子转移数目与质子转移的关系,然后通过不同的CV扫描,确定峰电流与扫数的关系,根据Laviron-equation方程,求得。你可以下载比如电化学测定氯霉素,或者苯硝基的化合,基本上都会有的。
2楼2014-10-14 23:09:45
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phoenixgck

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duan0718: 金币+10, ★★★很有帮助, 能不能更具体一点,扩散控制的电子转移速率怎么计算? 2014-10-15 22:55:51
如果电流是扩散控制,你求出的电子转移速率其实和扩散系数D0直接相关的,这样求不对

要降低电流到电子转移控制的范围,才能求出来电子转移速率。
3楼2014-10-15 02:57:12
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phoenixgck

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duan0718: 金币+10, ★★★★★最佳答案 2014-10-16 18:57:57
In the region of the limiting current, when the electrode process is mass-transfer controlled, the value of the current density is:

i_{limiting} = \frac {nFD} {\delta} C^*
where:

D is the diffusion coefficient;
δ is the diffusion layer thickness;
C* is the concentration of the electroactive (limiting) species in the bulk of the electrolyte.
C(0,t) is the time-dependent concentration at the distance zero from the surface.
4楼2014-10-16 07:37:06
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