One day, the world may partially run on clean hydrogen fuel. But a big barrier to that future is just how darn difficult it is to store hydrogen for later use. So one team of scientists have proposed making hydrogen "batteries" out of something we want to stop using as fuel: coal.
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Sources:
https://www.eurekalert.org/news-releases/990531
https://www.sciencedirect.com/science/article/pii/S0306261923001101?via%3Dihub [pay, down]
Nb: another recent study considered storing hydrogen in a bicarbonate-formate substance, which the PR simplified as just “baking soda” (it’s not baking soda) https://www.eurekalert.org/news-releases/992319
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