After my suggestion to Svein I decided to revisit my plasma experimemts and burn the produced hydrogen in an arc along the lines Bertho is investigating.
My plasma generator (the protype is in the photos on JLN's yahoo group) produces 2H2 O2 mixed in a forced flow design with NaOH electrolyte- the prototype used thermosyphon circulation. The problem I need to reduce the oxygen content below stoichiometric to leave some hydrogen for the atomic reaction . Can anyone suggest any simple way ? I think I will have limited success diverting some of the flow past the anode to a seperate outlet, but the flow is quite turbulent in this region with a lot of mixing going on and this solution requires some redesign of the reactor. Thanks for your input JohnH