| Hemp supercapacitors might be a good solution to the energy grid storage problem. Hemp absorbs carbon, doesn't leave unplowable roots in the fields, returns up to 70% of nutrients to the soil, and grows quickly just about anywhere. Hemp bast fiber is normally waste. Hemp anodes for supercapacitors are made from the bast fiber that is normally waste. Graphene is very useful; but industrial production of graphene is dangerous because lungs and blood-brain barrier. Hemp is an alternative to graphene for modern supercapacitors (which now have much greater power density in wH/kg) "Hemp Carbon Makes Supercapacitors Superfast”
https://www.asme.org/engineering-topics/articles/energy/hemp... > “Our device’s electrochemical performance is on par with or better than graphene-based devices,” Mitlin says. “The key advantage is that our electrodes are made from biowaste using a simple process, and therefore, are much cheaper than graphene.” > Graphene is, however, expensive to manufacture, costing as much as $2,000 per gram. [...] developed a process for converting fibrous hemp waste into a unique graphene-like nanomaterial that outperforms graphene. What’s more, it can be manufactured for less than $500 per ton. > Hemp fiber waste was pressure-cooked (hydrothermal synthesis) at 180 °C for 24 hours. The resulting carbonized material was treated with potassium hydroxide and then heated to temperatures as high as 800 °C, resulting in the formation of uniquely structured nanosheets. Testing of this material revealed that it discharged 49 kW of power per kg of material—nearly triple what standard commercial electrodes supply, 17 kW/kg. https://scholar.google.com/scholar?hl=en&q=hemp+supercapacit... https://en.wikipedia.org/wiki/Supercapacitor I feel like a broken record mentioning this again and again. |