Imagine turning fruit waste into technology that stores electricity. This would reduce food waste and promote clean energy storage. Postdoctoral researcher Vianney Ngoyi Kitenge transformed mangosteen peels into specialized carbon materials that he used to make supercapacitor energy storage cells. He came up with a simplified way to do this, hugely reducing the cost. This breakthrough converts agricultural waste into valuable components for energy storage technology. He sets out how it works and what’s needed to make it happen.