Here are links to two Electrolytic Disinfectant units which have MMO electrodes for electrolysis of Salt Water Solutions.
IPRee® 5V 1A Mini Disinfectant Generator Sodium Hypochlorite Ion Generator
Mini 5V USB Hypochlorous Acid Water Disinfection Sterilizing Making
Both units are powered through a USB plug connector which contains an internal
electronic timer chip which delivers current to the electrode assembly each time
it is plugged into a USB power source. The electrode assembly is immersed in
a container of salt water, the usb plug is inserted into a usb power source to
begin electrolysis of the salt water solution and after 5 minutes the internal
timer interrupts the current path to the electrode assembly. The units are made
for making dilute solutions of Sodium Hypochlorite for disinfection uses so the
timers are incorporated to assure the solution is weak and safe for people to
use without hazard.
For experimental use to create strong solutions of Sodium Hypochlorite or to
make small quantities of Sodium or Potassium Chlorate where the electrolysis
time would be much longer, the 5 minute timer must be eliminated. The easiest
way to do this is to remove the USB plug with the built-in timer from the electrode
assembly power cord by snipping it free. Should you desire to save the USB plug
with the timer just cut the cord to leave about an inch of wire with the plug so that
you can attach the wires to another project at some future time where the 5 minutes
of applied power may be a useful feature.
Expose the wires at the cut end of the electrode assembly cord to remove insulation from
the Red and Black wires to attach terminals for connection to an adjustable
power supply capable of producing an output of from 3.5 VDC to 4.5 VDC. This
voltage range applied to the electrodes immersed in a Salt Water Solution will result
in an electrolysis current of from 300 mA to 600 mA. The electrodes are designed to
tolerate a maximum current of 1 Ampere but I run mine at from 350 to 500 mA for all
that I do with them to keep from shortening their useful lives.
I have nipped the perforated electrode cover from the electrode assembly in order to
expose the two electrodes which permits unobstructed gas release from the plates
while electrolysis is underway.