Abstract:

In this paper, we discussed the basic elements which affect the shape of linear sweep voltammograms in the reaction process on the electrode surface, that is, heterogeneous electron transfer and mass transfer in liquid phase. Derived from the basic definition and principle of voltammetry, the "supply-demand" mode between electron and mass transfer determines the characteristics of voltammograms. A series of voltammetric behaviors under different electrochemical testing conditions were discussed, including conventional electrodes and microelectrodes, reversible and irreversible electrode processes, stationary and rotating disk electrodes, and electrocatalysis. The basic laws that affect the shape of voltammograms provide a reference for understanding the fundamental principles of linear sweep voltammetry and data analysis.

Key words: Principle of linear sweep voltammetry, Electrode reaction process, Interpretation of voltammograms, Macro-and ultramicro-electrodes, Reversibility, Rotating disk electrode, Electrocatalytic reaction