New Australian method uses peanut shells to produce high-quality graphene

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New method produces high-quality graphene from peanut shells. Researchers at the University of New South Wales in Australia have recently developed a method for producing high-quality graphene from waste peanut shells. This opens the door to producing cheaper and more sustainable electronic products and energy storage devices, while also facilitating the reuse of agricultural waste. Graphene is composed of a single layer of carbon atoms arranged in a hexagonal lattice; it is one of the thinnest, strongest, and best conductive materials known to science, and is regarded as a \"miracle material\". The research team explained that peanut shells are rich in lignin, a natural polymer rich in carbon. They developed a new method that, through a series of heat treatment steps, allows the carbon atoms in lignin to be rearranged in order to produce high-quality graphene. The new method uses peanut shell powder to produce graphene in two steps. The first step is to heat to 500 degrees Celsius for 5 minutes, in order to remove impurities and produce a carbon-rich material ； The carbon material is then subjected to flash Joule heating, which involves using an instantaneous current to heat the material to 3000 degrees Celsius within a few milliseconds; this massive amount of heat instantly rearranges the carbon atoms into a single layer of graphene. Researchers say that the preliminary preprocessing step is crucial, as it removes impurities and provides optimal carbon-rich materials, thereby minimizing defects in the final graphene products. Researchers noted that traditional graphene production is costly and energy-intensive ； The new method utilizes agricultural waste and does not require industrial chemicals, enabling significant cost reductions and lower carbon emissions; the energy cost to produce 1000 grams of graphene is only 1.3 dollars. They plan to achieve commercialization within three to four years, and to test the production of graphene using other waste materials such as coffee grounds and banana peels. The relevant research findings have been published in the international journal “Advances in Chemical Engineering”.