Ammonium chloride is an inorganic compound with the formula NH4Cl and a white crystalline salt that is highly soluble in water, on water ammonia, ethanol (low), glycerol.
Ammonium chloride can be usd as a simple electrolyte for zinc/carbon and water based supercapacitors.
More interesting uses is for synthesize a proton exchange membrane for proton flow batteries; for example it can be used in a dry NiMh battery, instead of alkaline wet solutions.
With CMC (carboxymethylcellulose) it can form a solid proton exchange membrane (biocompatible and biodegradable) or it can be used as a solid proton conducting electrolyte between MH and Ni(OH)2-NiOOH or other batteries based on protons.
For example there exist a lot of studies based on organic electrodes with organic redox couples like hydroquinones, rhodizoic acids, ascorbic acid and many others.