The word "hydroxide" refers to a chemical compound made up of the elements hydrogen and oxygen. It is a combination of the words "hydrogen" and "oxide."
If you'd taken any time to peruse this site, you would know that I have never made an issue of ammonium hydroxide in LFTB. (thelunchtray.com)
The researchers treated their carbon source with potassium hydroxide at 600 degrees Celsius to produce the powders with either sulfur or nitrogen atoms evenly distributed through the resulting porous material. (sciencedaily.com)