My goal is to increase the efficiency of a nickel-iron battery. One of the options to reach this goal is:suppressing the hydrogen production. Due to electrolysis, the electrolyt will start discomposing at a certain potential (when charging, about 1.6 Volt). I expect that the electrochemical stability/window of the solution increases when the water activity decreases.
Recently, i read an article about molecular crowding electrolytes, a proces in which the water activity is lowered due to the presence of other molecules. I would like to know if it is possible to decrease the water activity, due to molecular crowding, by increasing the concentration of KOH in the elektrolyt.