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Dry Cell Electrolyserby Jamie bagn on July 28, 2012

Table of Contents

Dry Cell Electrolyser ...........................................................................................................

Intro: Dry Cell Electrolyser ....................................................................................................

Step 1: Parts and Tools ......................................................................................................

File Downloads ...........................................................................................................

Step 2: Polycarbonate End Walls ...............................................................................................

File Downloads ...........................................................................................................

Step 3: Electrodes ..........................................................................................................

File Downloads ...........................................................................................................

Step 4: Gaskets ...........................................................................................................

File Downloads ...........................................................................................................

Step 5: Nuts, bolts and main assembly ..........................................................................................

Step 6: Valve assembily .....................................................................................................

File Downloads ...........................................................................................................

Step 7: Wire it up ..........................................................................................................

Step 8: Running the electrolyser ...............................................................................................

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Author:Jamie bagn

I can't spel, love survival stuff, knots, blowing stuff up, science, camping

Intro: Dry Cell ElectrolyserAn electrolyser is a piece of scientific equipment that splits polarised molecules into its ions. In this case it will split water into hydrogen and oxygen gas. A dry cellelectrolyser is an electrolyser that is completely enclosed; the other type is a wet cell electrolyser which can be two metal plates in a bowl of water. The equipment isfairly simple but the theory behind it is a bit more complicated, if you’re not interested in the theory then skip to step 1.

Here’s the theory: the electrolyser uses the different ionic charge on the different atoms in the molecule to split it into its respective charged atoms or molecules, for

example, water gets split into Hydrogen and Oxygen because in the water molecule the hydrogen is slightly positively charged and the oxygen is slightly negativelycharged. These charges are only very slight, +1 electron volt (ev) for each hydrogen and -2 ev on each oxygen atom. Just for comparison 1 electron volt is 1.6×10−1Coulombs (c) and 1 Coulomb is the charge transported by a steady current of one ampere in one second. The hydrogen is attracted to the negatively charged electroor Cathode and the oxygen is attracted to the positively charged electrodes or Anodes. At the anodes the oxygen ions loose an electron and bond to form oxygen gasthe cathodes the hydrogen ions get an electron from the cathode and then bond to form hydrogen gas. This transfer of electrons from and to the electrodes completesthe circuit and allows current to flow. A catalyst can be used to make the process more efficient by reducing the energy needed to start the process; the catalyst that Iis sodiumhydroxide in a 1 to 40 mix with deionized water. The water doesn’t need to be deionized but it extends the lifetime of the unit as minerals and other stuff wonbuild up on the electrodes.

Step 1:Parts and Tools

The PDF shows the parts of the electrolyser and how they're assembled, however I will go into this in more detail later.

There are several parts and a few tools that you will need.10mm polycarbonate8mm id 12mm od rubber tubing3mm rubber gasket material180cm M8 studding18x M8 dome nuts18x M8 nilock nuts4x 1/4in BSP aluminium washers2x 1/4in BSP male to male adapter2x 1/4in BSP male to 1/8in BSP female adapter2x 1/8in BSP to 8mm tube connector2x 1/4in BSP 2 way ball valve12AWG wire17x M7 ring terminal15x Flag crimpsLoctite pipe sealant or equivalent

13mm spannersDrillCrimp toolWire cuttersWire strippersJig sawPermanent markerMetal rulerSharp knife

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File Downloads

Assembled Electroliser.pdf (159 KB)[NOTE: When saving, if you see .tmp as the file ext, rename it to 'Assembled Electroliser.pdf']

Step 2:Polycarbonate End WallsI made the end walls out of polycarbonate as I had some laying around and it is a strong material that is actually used to make blast and bullet proof screens. I designthe end plates according to the amount of polycarbonate that I had but there inst really any limits, the end walls are 240X200mm. The end walls contain 18 8.5mm holthat allow clearance for M8 Bolts and a 11.4mm hole with a 1/4in BSP thread taped into it. The threaded hole is for the valves and the hose tails. The 8.5mm hole centare 14mm away from the edge of the of the plate and are 42.4mm horizontal and 43mm vertically spaced, the 1/4in BSP threaded hole is 42mm away from the top leftcorner horizontally and vertically. There is a PDF copy of the drawing attached bellow, I used Autodesk Inventor to design the plates as I got it free as a student from tAutodesk website.

File Downloads

Electroliser End Wall.pdf (134 KB)[NOTE: When saving, if you see .tmp as the file ext, rename it to 'Electroliser End Wall.pdf']

Step 3:ElectrodesThe electrodes are made of 0.7mm thick 304 grade stainless steel as it is pretty stable and unreactive, the best material would be gold but that would cost far to much

There are two different designs the only difference is the location of a 3mm hole, this hole allows the water and electrolyte to equalise in the cells of the electrolyser anthe bigger holes allow the gases out and are in line with the 1/4in BSP holes in the end walls. Both plates are 200x160mm, as this fits tightly between the bolts with therubber over them, and have a tag in the middle at the top that is 6.5x10mm and is for a flag connector for powering the electrolyser. The equalising holes are small toincrease efficiency and is located 20mm from the corner. The 10mm hole is located 22mm from the corner. Bellow are the drawings for both of the plates, you can eithcut them out yourself or get them made for you.

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Image Notes1. Electrode B2. Electrode A

File Downloads

Electroliser Electrode A.pdf (131 KB)[NOTE: When saving, if you see .tmp as the file ext, rename it to 'Electroliser Electrode A.pdf']

Electroliser Electrode B.pdf (131 KB)[NOTE: When saving, if you see .tmp as the file ext, rename it to 'Electroliser Electrode B.pdf']

Step 4:GasketsI made the 16 gaskets from clear PVC and bought it in the form a of walk-in freezer curtain strip measuring 200x3000x3mm this cost about £20 from eBay. I bought thPVC in the form of a walk-in freezer curtain as it was the correct width and therefore reduced the amount cutting necessary. The Gaskets are 200x160mm with a136x176mm cut out with 6x6mm chamfered corners (see PDF bellow).

File Downloads

Electroliser Gasket.pdf (126 KB)[NOTE: When saving, if you see .tmp as the file ext, rename it to 'Electroliser Gasket.pdf']

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Step 5:Nuts, bolts and main assemblyYou will need to cut 18 100mm lengths of M8 studding and file the ends so a nut fits on easily, on one end of each of the 18 bits of studding put a dome nut and a wasand then feed them through the 18 holes in one of the end walls. Next cut the rubber tubing into 18 lengths of 57mm and put them over the studding as insulation. Nexput one of the gaskets in between the bolts and the rubber tubing and then put an A plate, a gasket, a B plate, a gasket, an A plate... on top until you have used the 16gaskets, 8 A pates and 7 B plates ensuring that the 10mm holes line up with the 1/4in BSP hole in the end walls. Once all the plates and gaskets are on put the seconend wall on top and then put the washers on the studding and the nilocks on tightening the corners first and then the others.

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Step 6:Valve assembilyFinally the end is within sight, this bit is fairly simple, first you put a 1/4in BSP aluminium washer on the 1/4in BSP male to male adapter and then put Loctite on the thrand screw it into the 1/4in BSP 2 way ball valve and tighten. On the other side of the valve Loctite and screw in the 1/4in BSP male to 1/8in BSP female adapter and ththe 1/8in BSP to 8mm tube connector into that. the other 1/4in BSP aluminium washer goes on the other end on the 1/4in BSP male to male adapter which you MUSTNOT put Loctite on as it will make polycarbonate or plastic brittle, repeat this once. Screw these assembles into the end walls.

Image Notes1. 8mm tube connector2. 1/4in male to 1/8in female BSP adapter3. 1/4in BSP ball valve4. 1/4in BSP male to male adapter5. There are 3 1/4in BSP aluminium washers either side of the valve and on the outer side of the 1/4in BSP adapter

File Downloads

Valve Assembily.pdf (129 KB)[NOTE: When saving, if you see .tmp as the file ext, rename it to 'Valve Assembily.pdf']

Step 7:Wire it upThis is the final part of construction, cut the 12AWG wire into 15 100mm lengths and cut the rest in half strip about 8mm from each end of the lengths of cable and crima ring terminal onto one end of all of the lengths of the cable and on the other end of the short cables crimp a flag terminal and on the other end of the long cables striabout 15mm and you can tin this using a soldering ion but this isn't necessary. Penultimately on each of the tabs on the electrodes put one of the short cables using th

blue flag terminals. Finally using M6 bolts connect the M7 terminals together on each side and one of the longer cables on each side.

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Step 8:Running the electrolyserFill the electrolyser to just below the 10mm holes with a 40 to 1 mixture of water, preferably distilled, and 0.1 mole sodium hydroxide. Next connect some more of theorange rubber tube to one of the hose tails and the other end to some form of storage, eg plastic bag. Finally connect the cables to a car battery or high current powersupply capable of supplying 12 volts and more than 20 amps. You should find that the bag fills with hydrogen and oxygen gas, this gas can be used as a fuel for cookior in an engine as it is highly flammable and when you burn it it produces water again so its environmentally friendly.

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