The time delay in electrochemical measurements of a finite-volume system
Data(s) |
2009
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Resumo |
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. |
Identificador | |
Idioma(s) |
英语 |
Fonte |
Liang SA;Guo QJ;Dong XD.The time delay in electrochemical measurements of a finite-volume system,JOURNAL OF ELECTROANALYTICAL CHEMISTRY,2009,633(1 ):235-239 |
Palavras-Chave | #MAPPING CONCENTRATION PROFILES #DIFFUSION-CONTROLLED CURRENT #RANDOM-WALK #ULTRAMICROELECTRODE PROBE #AMPEROMETRIC MEASUREMENTS #LIMITED NUMBER #ELECTRODE #CELL #SIMULATION #MOLECULES |
Tipo |
期刊论文 |