کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
220209 | 463320 | 2009 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The time delay in electrochemical measurements of a finite-volume system The time delay in electrochemical measurements of a finite-volume system](/preview/png/220209.png)
For a sphere electrode enclosed in finite-volume electrolyte, the measured current will deviate from the result predicted by the semi-infinite diffusion theory after some time. By random-walk simulation, we compared this time to the one needed for diffusion layer to reach electrolyte boundary, and revealed a clear signal delay of electrochemical current. Further we presented a quantitative description of this delay time. The simulation results suggested that the semi-infinite diffusion theory can even be applied when the theoretical diffusion layer grows to 1.28 electrolyte thicknesses, with an accuracy better than 0.5%. We attributed this time delay to the molecules’ finite propagation velocity. Finally, we discussed how this delay can influence and facilitate the following electrochemical detection towards the nanometer and single-cell scale.
Journal: Journal of Electroanalytical Chemistry - Volume 633, Issue 1, 1 August 2009, Pages 235–239