What do you think about a battery made from rhubarb or some other plant that can grow in your garden? Such metal-free flow batteries have the capability to transform grid-scale energy storage.
Researchers have been searching for a flow battery that relies on electro-chemistry of naturally abundant, organic molecules — to solve the problem of renewable energy storage.
Based on this paper, quinones, which are found in green plants, seem to be the leading candidates for the job. They act as eletrocatalysts, dissolve in water, and are found in green plants. The day when the average basement will have its own renewable energy storage tank is getting closer.
To read more about it, see this article about the Harvard School of Engineering.