As bacteria feed on organic waste electrons are produced, so they could potentially be used as a source of power. A team of researchers at Binghamton University, NY have found a way to incorporate microbial fuel cells into a battery that is made of paper and also foldable. Since this new battery is paper-based, it is also completely biodegradable.
The battery they created can be paired with low-power biosensors, and then easily disposed of in an environmentally friendly way once it is no longer needed. It is also extremely cheap to make. This battery is perfectly suited for use in environmental sensors or medical procedures, as it can create power from virtually anything where microbes are present, such as water, soil or even the human body. It can also work using any liquid, including body fluids, namely blood, sweat, urine, or saliva.
To create the battery the scientists placed an anode on one side of the paper, which is made from a reservoir of bacteria-filled water and from a conductive polymer. On the other side of the paper, a small amount of silver nitrate encased in a thin layer of wax forms the cathode. As the paper is folded an electric current is produced. An accordion-style fold creates the most electricity, while the paper can also be folded in different ways to generate different levels of electrical output.
This is the upgraded version of the paper-based origami-style battery that lead researcher on the team, Seokheun “Sean” Choi built some time ago. It doesn’t need as many layers of paper as the previous version, since all the components are integrated into a single sheet of paper.
The uses for this innovative new battery are many and varied. It could be used in disaster relief situations, on battlefields, as well as in medical clinics in remote areas. In addition, they can also easily be used to detect pathogens and toxins in the environment.