The effect of hydrogen bonding on the absorption spectra during electrochemical processes is dependent on the specific conditions of the experiment, including the applied potential and the solvent used. However, one possible change that can be observed is a shift in the absorption spectrum due to changes in the electronic structure of the compounds. For instance, if the hydrogen bond is broken upon oxidation, a shift in the absorption spectrum of one or both of the compounds can be observed. Additionally, changes in the intensity of certain absorption bands or the appearance of new absorption bands can be observed due to the formation of new species as a result of electrochemical processes. The exact changes in the absorption spectra will depend on the nature of the oxidation or reduction processes involved. Overall, the effect of hydrogen bonding on the redox potential of a system depends on the specific system and conditions, and can range from increasing the redox midpoint potential to causing large negative shifts in the apparent, reversible one electron oxidation.

Before doing spectroelectrochemistry, you should study the electrochemistry of your system. Before doing experimental work you are obliged to search literature. This paper directly related to your question

J. Org. Chem.2005,70, 10817-10822

Electrochemically Controlled Hydrogen Bonding.Redox-Dependent Formation of a 2:1 Diarylurea/Dinitrobenzene2-Complex