, Choi says that our bodies are filled with nontoxic microbes that help with digestion and other functions.
“We use these spores as a dormant, storable biocatalyst,” he said. “The spores can be germinated when the nutrients are available, and they can resume vegetative life and generate the power.” The research is very fresh but Choi and his students are already looking ahead to improving the biobatteries. They want to increase the speed at which the fuel cell germinates completely. It currently takes about an hour.
In addition, the cell generates around 100 microwatts per square centimeter of power density — enough for wireless transmission, but 10 times more would offer many more options for use. “I believe that our micro-fuel cell has a huge potential, but we have a long way to go,” he said.Abstract: Functioning ingestible capsules offer tremendous promise for a plethora of diagnostic and therapeutic applications. However, the absence of realistic and practical power solutions has greatly hindered the development of ingestible electronics. Microbial fuel cells hold great potential as power sources for such devices as the small intestinal environment maintains a steady internal temperature and a neutral pH.
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