Zero Current Potentiometry for Measuring the Interface Potential at the Electrode/Solution Interface. Theoretical and Experimental Study |
| |
| Authors: | N Y Wu Y B Zang W Gao M T Xu |
| |
| Institution: | 1. College of Chemistry and Chemical Engineering, Henan Key Laboratory Cultivation Base of Nanobiological Analytical Chemistry, Shangqiu Normal University, Shangqiu 476000, P.?R. China;2. School of science, Hebei University of Engineering, Handan 056038, P.?R. China;3. Chenguang Biotech Group Co., Ltd, Handan 057250, P.?R. China tel.: +86?310?8859305;4. fax: +86?310?8859306 |
| |
| Abstract: | A novel electrochemical approach has been proposed to measure the interface potential at the electrode/solution interface based on reconstructing the three‐electrode system of a potentiostat. In this work, the method was investigated both theoretically and experimentally. Mathematical expressions, describing current? potential characteristics, were derived. Zero current potential Ezcp was defined as the potential at which the current is zero based on linear sweep voltammetry, and was determined from the I? E curve to measure the interface potential. The experimental results obtained with the couples Fe(CN)63?/Fe(CN)64? and Co(NH3)63+/Co(NH3)62+ as examples agreed well with the theory. The proposed approach exhibits an excellent performance for measuring the interface potential due to the advantages of rapidity, high stability and accuracy. |
| |
| Keywords: | Interface potential Zero current potentiometry Open circuit potentiometry |
|
|
