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Zero Current Potentiometry for Measuring the Interface Potential at the Electrode/Solution Interface. Theoretical and Experimental Study
Author(s) -
Wu N. Y.,
Zang Y. B.,
Gao W.,
Xu M. T.
Publication year - 2013
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201300162
Subject(s) - potentiostat , measure (data warehouse) , interface (matter) , current (fluid) , electrode , nernst equation , work (physics) , analytical chemistry (journal) , cyclic voltammetry , voltammetry , electrochemistry , chemistry , solution of schrödinger equation for a step potential , zero (linguistics) , materials science , thermodynamics , physics , aqueous solution , computer science , chromatography , data mining , linguistics , gibbs isotherm , philosophy
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 currentpotential characteristics, were derived. Zero current potential E zcp 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) 6 3− /Fe(CN) 6 4− and Co(NH 3 ) 6 3+ /Co(NH 3 ) 6 2+ 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.