About: Hi Friends, Follow me for more Physics related projects.. I'm a renewable energy passionate. Join me, Have FUN

Getting hydrogen from water is one of today’s hottest and fastest-evolving areas in the renewable energy world.

Lwet's make Hydrogen from Water!

1. Electrolysis

Electrolysis is the technical name for using electricity to split water into its constituent elements, hydrogen and oxygen. The splitting of water is accomplished by passing an electric current through water. The electricity enters the water at the cathode, a negatively charged terminal, passes through the water and exists via the anode, the positively charged terminal. The hydrogen is collected at the cathode and the oxygen is collected at the anode. Electrolysis produces very pure hydrogen from water for use in the electronics, pharmaceutical and food industries. Relative to steam reforming, electrolysis is very expensive. The electrical inputs required to split the water into hydrogen and oxygen account for about 80% of the cost of hydrogen generation. Potentially, electrolysis, when coupled with a renewable energy source, can provide a completely clean and renewable source of energy.

Step 1: How to Make

Take steel sheet

cut it into 2.5"*2.5" pieces

make holes at the centre

connect them as shown in the diagram

Place it inside a plastic bottle

Make a hole on the bottle and connect a plastic pipe.

Connect lead wires

Use silicon to make the bottle air tight

Pour salt water into the bottle

close the bottle

connect leads to 12v battery

That's all


For more information and projects Newphysicist

More DIY Videos Youtube channel



    • Metalworking Contest

      Metalworking Contest
    • Water Contest

      Water Contest
    • Tiny Home Contest

      Tiny Home Contest

    7 Discussions

    You can get much cheaper higher current supplies designed for constant current

    There is an issue with the use of hydrogen and it is the efficiency. It great to see someone so young doing an Instructable on Hydrogen gas generation. Use PV = nrT and to get hydrogen this was without high voltage is not that efficient. Otherwords you need a lot of energy compared to methane or gasoline to be equal to KJ of power. Great instructable though.

    1 reply

    However crude oil will eventually deplete and methane can only be produced by bacterial decay and takes huge amounts of waste, if we need a fuel to burn instead of electricity for whatever reason like storing more energy in a smaller area then water is in abundance and separates into hundreds of litres of hydrogen

    You may want to add a few neutral plates between the charged ones, as it will make the whole system much more efficient. I've done a little research on these types of generators, and you may want to separate the positive and negative plates to prevent a flashback explosion, that would be no fun.

    Just to correct the chemistry above: this will produce H2 + O2 gases mixed. Water is actually HOH structurally and steam is not particularly flammable, but I see what you mean ?

    That's actually HHO gas. It's hidrogen + oxygen mixed.

    1 reply

    Yes, and it's very dangereous as it explodes violently !