Converting Ions into Electricity

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Hey all. I'm trying to find more info on converting moving ions into electricity. AKA Direct Energy Conversion. Anyone know any good sources? I don't really understand how they do it yet, even after reading a few things I found on google.
 
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You must be referring to high energy ions, right??

That I'm not familiar with, but ions moving in an electrolyte is how a battery works...as well as corrosion in salt water...and wiki has reading material...there have also been discussions here in the forums recently...

In general any charged particle, that is any ion, can produce electricity...

Have you considered checking how test equipment works?? They make such conversions.
 
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I'm referring to high speed ions, the kind that come from fusion reactions. I was wondering how you can convert them into electricity simply by slowing them down and capturing them. That seems to be the simplified explanation from what I can tell. I just have no idea why that works.