I've been trying to get a desulfurization reaction to work electrochemically but after leaving the reaction overnight I am getting large pH changes from pH 7 to pH 13/14 and my substrate is

very base sensitive.

Here are my conditions:

Divided cell, graphite electrodes, water, NaCl (electrolyte), -1.0 V potential.

I have tried using a buffer but it doesn't seem to help. Why does this occur and is there a way to avoid these pH changes?

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