calcium chloride, dry batteries
John K,
You can easily buy some calcium chloride at lowes under the name DampRid, look for it in either the cleaning supplies or in the plumbing section. Its a moisture absorber. I have also used this material in battery experiments.
One other material I have used and might suggest for those of you looking into these "dry" batteries is sodium silicate, sometimes called water glass and can be found at pottery supply stores. This material when dry shares a similiar characteristic of the sodium chloride, as well as silica gel beads.
I began experiments with both sodium silicate and silica gel following up on work from John Hutchison, but my work took a turn from his electret type cells when i realized these materials were not good for electrets. However they are great desiccants, so they literally suck water out of the air and draw it into your cell. With these materials you may see potential to make a water cell that is maintenance free and possibaly better preforming that the air cell because they should draw in more moisture. And that became my goal with that project, i have one cell that has been running an LED for a year now constant. I really like John B's pyrite idea, i was always looking for materials that would not corrode and oxidize killing their performance and i think that might do well.
Personally, i am under the impression that all these type cells are chemical reactions that are taking place from the fact that water is never truely neutral, due to carbon dioxide in the air, forming a weak solution of carbonic acid. But i never got around to fully testing that theory.
Cody
John K,
You can easily buy some calcium chloride at lowes under the name DampRid, look for it in either the cleaning supplies or in the plumbing section. Its a moisture absorber. I have also used this material in battery experiments.
One other material I have used and might suggest for those of you looking into these "dry" batteries is sodium silicate, sometimes called water glass and can be found at pottery supply stores. This material when dry shares a similiar characteristic of the sodium chloride, as well as silica gel beads.
I began experiments with both sodium silicate and silica gel following up on work from John Hutchison, but my work took a turn from his electret type cells when i realized these materials were not good for electrets. However they are great desiccants, so they literally suck water out of the air and draw it into your cell. With these materials you may see potential to make a water cell that is maintenance free and possibaly better preforming that the air cell because they should draw in more moisture. And that became my goal with that project, i have one cell that has been running an LED for a year now constant. I really like John B's pyrite idea, i was always looking for materials that would not corrode and oxidize killing their performance and i think that might do well.
Personally, i am under the impression that all these type cells are chemical reactions that are taking place from the fact that water is never truely neutral, due to carbon dioxide in the air, forming a weak solution of carbonic acid. But i never got around to fully testing that theory.
Cody
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