A tiger on a leather bag is not just decoration in this experiment. Its back and tail double as an energy-storing device. That small visual twist sits at the center of a new study from Jilin University in China. In this work, researchers used a CO2 laser to write conductive patterns directly onto vegetable-tanned leather. As a result, they created a set of flexible microsupercapacitors. These are tiny energy devices that can store charge and help steady electrical signals in wearable electronics. “Using a laser, we directly write conductive patterns onto vegetable tanned leather to create microsupercapacitors that can store energy and help smooth electrical signals so that wearable electronics run more reliably,” said research team leader Dong-Dong Han. The work, published in Optics Letters, points to a simpler route for making wearable electronics with fewer chemical-heavy steps and less dependence on synthetic materials. Instead of building devices on plastic, the team used vegetable-tanned leather. This is a natural material processed with plant-based extracts and already valued for breathability, flexibility, biocompatibility and comfort against skin. …