Such microbial fuel cells (MFCs) are not new, but their practical application has been hampered by unstable operation and dependence on the constant availability of water and oxygen, which is a problem when buried in soil. The Northwestern University team solved this problem with a clever design that resembles a vertical cartridge planted in the ground.
This design has several key features:
Disc-shaped carbon felt anode: It is buried deep and captures electrons released by soil-degrading microbes.
Vertical conductive cathode: Located at the top, it facilitates the absorption of oxygen and remains accessible even during flooding.
Air gap and protective cover: Provides constant oxygen access to the cathode and prevents debris from entering.
Waterproof coating: ensures that the top of the cathode remains functional even when submerged in water.
This unique design stands out with its efficiency. 68 times more energy than required for internal operations and data transfer. Consistent power across varying soil moisture levels, including dry conditions.
As long as organic carbon serves as fuel for microbes, its business potential is almost unlimited.
While this technology isn’t designed to power cars or smartphones, it could create a variety of sensors that are durable and low-maintenance.
Source: Ferra
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