IEEE Std 484TM – 2002 states that the maximum hydrogen evolution rate for an electrochemical cell is 0.000269 ft3/min per charging ampere per cell at 77 °F and standard pressure (29.92 in Hg) or 0.127 mL/s per charging ampere per cell at 25 °C and standard pressure (760 mm Hg).  This has been in the standard since it was first published in 1975, but what is the basis for this value? It turns out that back in 1975 people were asking the same question and Jim Anderson who was a member of the IEEE Battery Working Group at the time, actually derived the number using Faraday’s Law, Avogadro’s Law and Charles’ Gas Law and issued the derivation in a letter to the chair and members of the IEEE Battery WG in February 1975.

Having been a member of the IEEE Battery WG at that time, I remembered that letter and recently found a copy of it in my records in storage.  I wrote to Jim Anderson and asked permission to post it on this and the web sites.  Jim has agreed to let me post it and you can now download this copy of an original historical document for free and if you are ever asked where the hydrogen evolution rate in the IEEE standards came from you’ll know the answer.

Simply go to the Download section of either web site to download your copy of the letter now!