Researchers at Northwestern University have developed a dirt-powered fuel cell that generates electricity from soil microbes and can operate underground sensors for more than 120 percent longer than similar systems.
The device uses naturally occurring bacteria to break down organic material in soil and produce a steady electric current
The fuel cell, roughly the size of a paperback book, captures energy released as microorganisms decompose organic carbon in dirt. It functions in both dry and flooded soil conditions, producing power through a microbial fuel cell design that includes an anode, cathode and electrolyte. The system relies on bacteria that release electrons during decomposition, which move through the device to create an electric current.
Researchers demonstrated the technology by powering soil moisture and touch sensors for agricultural and environmental monitoring
The team used the fuel cell to operate sensors measuring soil moisture and detecting touch, which could support monitor wildlife movement through fields. A small antenna sends data wirelessly by reflecting existing radio frequency signals, minimizing energy employ. The device proved reliable across a wide range of environmental conditions during testing.
The technology offers a potential alternative to batteries that contain toxic materials and contribute to electronic waste
Traditional batteries rely on lithium, heavy metals and complex global supply chains, although contributing to growing electronic waste problems. As the Internet of Things expands toward trillions of devices, researchers say alternatives are needed to avoid using hazardous materials in every low-power application. The dirt-powered system provides a sustainable option for decentralized sensor networks where only small amounts of energy are required.
How long can the dirt-powered fuel cell operate compared to similar systems?
It produced more sustained power than similar systems, lasting about 120 percent longer.
What types of sensors can the dirt-powered fuel cell power?
The team used the fuel cell to operate sensors that measure soil moisture and detect touch, which could help monitor wildlife movement.
