A stream of compressed air does not look like a power source. In factories, it usually hisses through pipes, drives tools, then disappears as waste. But under the right conditions, that same airflow carries invisible electrical potential, especially when tiny particles move with it.
Engineers have now found a way to tap that overlooked energy.
Researchers from
Chung-Ang University in South Korea, working with collaborators from
Kumoh National Institute of Technology, the
Massachusetts Institute of Technology, and
National Taiwan University, built a device that converts compressed air into electricity using static charge. Their work appeared in Advanced Energy Materials.
The system takes inspiration from a Tesla turbine, a design that spins using fluid flow rather than traditional blades. Instead of friction-based contact, the new generator relies on what the team calls the particulate static effect.
“During the research, we were curious about what would happen if high-speed—or high-pressure—wind blows onto the triboelectric nanogenerator. So, we fabricated a Tesla turbine-inspired triboelectric
nanogenerator structure that can be operated with high-pressure air and analyzed the data. From these results, we observed the particulate static effect: the particulate matter in air can also generate surface charge on the triboelectric layer,” said Professor Sangmin Lee of Chung-Ang University.