What is the energy cost to produce 1kg of graphene using this new method?

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The energy cost to produce 1kg of graphene using the new method is US$1.30.

Australian researchers have developed a novel process that utilises discarded peanut shells to produce graphene, with the energy expenditure for creating one kilogram of this material estimated at US$1.30. This method converts a naturally occurring polymer found in plants into high-quality graphene through a rapid heating technique. The development holds the potential for more affordable and sustainable applications in electronics and energy storage.
Lignin as a Key Component

The breakthrough hinges on lignin, a carbon-rich polymer present in plant cell walls. Researchers discovered that lignin, abundant in peanut shells, can be effectively transformed into graphene. This finding suggests the process could be adaptable to other organic waste materials containing lignin, such as coffee grounds or banana peels, for large-scale manufacturing.
The Two-Step Heating Process

The innovative technique involves a two-stage heating process. Initially, peanut shells are heated to approximately 500 degrees Celsius, resulting in a carbon-rich char. This is followed by a flash joule heating phase, where temperatures reach around 3,000 degrees Celsius for mere milliseconds. This rapid heating rearranges the carbon atoms into single-layer graphene, crucially without the need for chemical additives or fossil-fuel-based inputs.
Environmental and Economic Advantages

This new method offers significant economic and environmental benefits. Beyond the low energy cost of US$1.30 per kilogram of graphene, the process is reported to reduce both production time, to approximately 10 minutes, and overall emissions. The use of waste materials like peanut shells also contributes to waste transformation, aligning with sustainable manufacturing goals.

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What is the energy cost to produce 1kg of graphene using this new method?

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