for all I know meyer could have been mistaken about his claims
the questions is how to create hydrogen right?
Water can have many isoforms, because the angle between the two hydrogens can change and stays like this for a while they say it has a memory effect, it's lattice order changes but the main uses for this effect is that it alters the wetting properties of water so water changes it's surface energy, this is the ability of materials to repel each other, these characteristics don't really change the energy required to do electrolysis but the surface energy may alter the voltage of a cell because the Helmholtz layer which is a thin layer of ions near the electrodes changes thickness, but again we're talking about faraday electrolysis with the faraday law of electrolysis , its taught in undergraduate thermodynamics lesson , you cant just electrolyze water and get net energy gain, much of it must be turned to heat.
if you want to use photocatalyst then you must make nanocatalyst by reducing metal salts preferably in the presence of something conductive like graphite or polyaniline as a capping agent so the resistive loss will be low, nanocatalyst have almost 200% gains in efficiency compared to regular catalysts
I've used TiO2 in non aqueous solutions and it actually adorbs a lot of hydrogen, it also adorbs water vapor but last time I checked the reduction potential is not high enough for water electrolysis, even though 1.2v may do you usually need 1.8v for it so you definitely need to custom make titanium oxides for photocatalysis of water
it means you replace electrolysis with photocatalysis where photons get turned into electrons and directly transferred to water so you can combine the two, I mean the UV from sparks may get turned into excitation energy for a photocatalyst but the main thermodynamic law will still apply turning most electricity to heat, you have spark turned into heat and light, electrons getting turned into heat in electrolysis and light getting converted back into electricity with the photocatalyst but you're producing heat in both methods so the net gain is negative
let's say meyer was turning spark directly into excitation energy for the photocatalyst which hasn't been done before, this means no actual electrolysis is being done and it's all done by the photocatalyst but why not just use a UV lamp with all it's losses to excite the photocatalyst to make the exact same lossy mechanism as electrolysis?
creating sparks means you have to spend energy in electron collisions so it's not a waste free method of creating photons!
water must be one of the most stable molecules in the universe and you're trying to break it apart, why not use alcohol with water as fuel? alcohol can be easily made by brewing sugar and the cost of making yourself is low, although its still illegal to run unregistered fuels