GeS nanoflowers hold promise for future energy storage

The so-called GeS flower holds promise for next-generation energy storage devices and solar cells.

‘Creating these GeS nanoflowers is exciting because it gives us a huge surface area in a small amount of space,’ said Dr Linyou Cao, an assistant professor of materials science and engineering at NC State and co-author of a paper on the research. ‘This could significantly increase the capacity of lithium-ion batteries, for instance, since the thinner structure with larger surface area can hold more lithium ions. By the same token, this GeS flower structure could lead to increased capacity for supercapacitors, which are also used for energy storage.’

To create the flower structures, researchers first heat GeS powder in a furnace until it begins to vaporise. The vapour is then blown into a cooler region of the furnace, where the GeS settles out of the air into a layered sheet that is 20–30nm thick and up to 100µm long. As additional layers are added, the sheets branch out from one another, creating a floral pattern similar to a marigold or carnation.