Are micro- and nanoelectrodes just smaller versions of regular electrodes?

Fundamental differences in behavior of micro/nanoelectrodes and regular electrodes are illustrated. The selected cases are convenient for student laboratory courses. An example of determination of diffusion coefficients of both the substrate and the product of electrode reaction, which is only possible under conditions of using microelectrodes in the absence of added supporting electrolyte, is presented in detail. The problems and possibilities generated by the use of nanoelectrodes are also addressed.