“It’s very efficient, with almost 35% conversion of the biochar and solar energy into hydrogen,” said Rohit Chauhan
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What chars the bio?
From the article, they use the power wattage of a AA battery to do the job. It doesn’t mean they use an actual AA battery, but the wattage equivalent.
So, it sounds like to me that they roast it over time on a low wattage.
All they are doing is replacing coal as a carbon source with biochar. Otherwise they are using someone else’s process.