Art of Paper-Cutting Inspires Self-Charging Paper Device
Despite the many advances in portable electronic devices, one thing remains constant: the need to plug them into a wall socket to recharge. Now, researchers report in the journal ACS Nano the development of a lightweight, paper-based device inspired by the Chinese and Japanese arts of paper-cutting that can harvest and store energy from body movements.
Portable electronic devices, such as watches, hearing aids, and heart monitors, often require only a little energy. They usually get power from conventional, rechargeable batteries. But Zhong Lin Wang, Chenguo Hu, and colleagues wanted to see if they could un-tether our small energy needs from the wall socket by harvesting energy from a person’s body movements. The researchers have been working on this approach in recent years, creating triboelectric nanogenerators (TENGs) that can harness the mechanical energy all around us, such as that created by our footsteps, and then use it to power portable electronics. But most TENG devices take several hours to charge small electronics, like sensors, and they’re made of acrylic, which is heavy.
Wang and colleagues turned to an ultra-light, rhombic, paper-cut design a few inches long and covered it with different materials to turn it into a power unit. The four outer sides, made of gold- and graphite-coated sand paper, comprised the device’s energy-storing supercapacitor element. The inner surfaces, made of paper and coated in gold and a fluorinated ethylene propylene film, comprised the TENG energy harvester. Pressing and releasing it over just a few minutes charged the device to 1 volt-- enough to power a remote control, temperature sensor, or a watch.
The authors acknowledge funding from the Georgia Tech Hightower Chair Foundation, the Thousands Talents Plan of China, and the Key Technologies R&D Program from the Ministry of Science and Technology (China).