Hence, the evolution of the Pt 111 Bragg peak was studied as a function of the applied potential (not shown here) revealing a variation of ~10−3 degrees in its 2θ-position, which is close to the resolution limit of this experimental approach.
This change in diffraction angle corresponds to a thermal strain of b10−4 and, thus to a temperature increase of b10 °C at U = 9 V.
Thus, the thermal expansion by Joule heating was neglected for the further studies.