Copper Oxide Thermoelectric Generator Can Light An LED

On Hackaday, we usually end up featuring projects using building blocks (components, platforms…) that can be bought on the market. We however don’t show many hacks that rely on basic physics principles like the one shown in the picture above.

In the video embedded below, [nylesteiner] explains that copper oxide can be formed when heating a copper wire using a propane flame. When two oxidized wires are placed in contact with each other, an electrical current is produced when one wire is heated much hotter than the other. The trade-off is that the created thermocouple generates a small voltage but a ‘high’ current. However, when you cascade 16 junctions in series you can generate enough voltage to light up an LED. Even though the complete system isn’t particularly efficient at converting heat into electricity, the overall result is still quite impressive in our opinion. We advise our readers to give a look at [nylesteiner]‘s article and blog to discover his interesting adventures.

 

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Light LED’s with FIRE!

Reader [Andre] sent in a link which tells us all about this “cool” Copper Oxide Thermoelectric Generator. All you need is a bit of solid copper wire and a gas torch. Burn the wire so it gets a nice coating of oxide. From there, it is a matter of making the 2 sections of burned wire cross at a point and heat up only one of the wires. Whichever is hotter forms a cathode and whichever one is cooler is the anode.

Just one of these junctions is enough to produce a few hundred millivolts, but the author takes it a step further, well 16 steps further. He made a ring of these junctions in series, which is enough to light a bright blue LED. While the author notes that this thing is producing a considerable amount of voltage, its not producing much amperage. This could come in very handy in the future, like if you need some additional LED lighting for your camp stove.

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