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Black powder in a battery? Answered

I was taking apart a used C-cell battery and found this black powdery substance. What is it?

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AndyGadgetBest Answer (author)2009-09-24

It's manganese dioxide, which I think is there to reduce the amount of hydrogen produced from the electrolytic reaction.

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seandogue (author)2009-09-24

that would be the electrodes if I'm not mistaken.

see

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