Customizable Fishbone Lamella Gas Seperation Grid for Electrolysis by mechadense

Last crawled date: 3 years ago

This is a halve grid for gas separation in an electrolysis apparatus.
When two (mirrored versions) of these are put together back on back the lamellas form herringbone shapes. This disallows the gasses to pass from one side to the other and mix.
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In a concrete application a gas separation wall must be extended upwards and the fluid level must be always kept above the grid.
Standalone this thing is incomplete. An electrolysis chamber capable of gas separation is needed in conjunction. It might be a good idea to design the gas splitter top as one piece print with mainly diagonal surfaces to archive maximum gas tightness.
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pros & cons:
no separation membranes (filterpaper / 0.1mm mesh fine lye resistant textiles) needed
if separation membranes are used nonetheless they are mechanically stabilized by the grid
more distance between the plates (resistive losses) more electrolyte needed
less water cross section between plates
Some data randomly found on the net (no guarantee of correctness):
1.5mm to (2.0mm) for bubble-flow needed
keep current below 85mA/cm^2 of plate area
try to archive 2V voltage drop per plate
=> six plates in series are useful:
connect only the outermost two for 12V operation and
connect only the second from outermost for for 9V operation
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One side can be made to have no slide-in border so that one can look in when a transparent window is glued onto the chamber.
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problem:
ABS is rather not lye resistant
PET is not lye resistant at all
PLA: ??
nylon: ??
PP & HDPE: is good
cast polyurethane: ??