I used aluminum as the sacrificial electrode,and stainless steel as the air electrode.table salt for the electrolyte.good project for green friendly for the wast products are non-toxic and easily delivered back into the ocean safely.

I like your attitude for the adventure.I was there for over fifty years,and made hundreds,but now they are all over the market place and do not need to be created anymore.enjoy looking through catalogues and use your ingenuity in their usage.good luck!

Intumescence.it also goes the other way.a gas state directly to a solid.sometimes the word used is intuminescence.

Galena is used as a semiconductor in electronics (similar to germanium,selenium,silicon,carborundum) but it has the lowest forward drop voltage as a passive rectifier for detecting electricity.lead sulfide has the easiest electron orbit drop level of any known easily available natural substance.