Researchers at Empa’s Cellulose and Wood Materials laboratory have developed a fungal-based microbial fuel cell that can power small electronic devices. The bio-based power source combines two types of fungi to generate electricity through their natural metabolic processes. While the power output is modest, it can sustain a temperature sensor for several days.
The device utilizes a dual-fungal system, with a yeast fungus on the anode side releasing electrons and a white rot fungus on the cathode capturing and conducting the electrons. Unlike traditional batteries, this fungal-powered cell is both non-toxic and biodegradable. The components are manufactured using 3D printing technology with specially developed cellulose-based conductive ink.
“For the first time, we have combined two types of fungi to create a functioning fuel cell,” says Empa researcher Carolina Reyes. The research team faced several technical challenges in developing a suitable printing ink that could maintain cell viability while meeting requirements for conductivity and biodegradability. The fungi can even use the cellulose material as a nutrient source during decomposition.
The fungal cells can be stored in a dried state and activated when needed by adding water and nutrients. This feature makes them potentially useful for agricultural and environmental monitoring applications. The research was supported by the Gebert Rüf Stiftung as part of their Microbials funding program.
The research team is currently working to improve the power output and longevity of the fungal batteries. “Fungi are still under-researched and under-utilized, especially in the field of materials science,” note researchers Reyes and Nyström, indicating potential for further development in this area.
Source: newswise.com