For children's daily life, drooling and urinating pants are almost inevitable. Even when I grow up, I wake up in the morning and find that the pillow is wet with saliva. These saliva have not been taken seriously because of their continuous source and huge reserves. Actually, wasted saliva is also a precious energy source.

According to the foreign website “fastcoexist.com” reported on April 10, one day in the future, saliva will be able to provide power for small devices, and saliva, the most common resource, is easier to collect than large renewable energy sources such as wind and water. And control.

It is reported that in March 2014, the joint research team of Pennsylvania State University and King Abdullah University of Saudi Arabia (KAUST) demonstrated the possibility of generating electricity from saliva. This microbial-fueled fuel cell requires the use of highly conductive graphene, which converts organic matter in saliva into about 1 microwatt of electricity. Most importantly, its cost is only about 2-3. USD (less than 20 RMB).

Although the 1 microwatt of electricity produced by saliva power sounds insignificant compared to solar panels, its purpose is not to generate electricity intensively. In fact, 1 microwatt of electricity is enough to support the operation of appliances such as diagnostic assay analyzers on the battlefield or in rural areas where there is no water or electricity. The researchers said that if the analyzer is made of silicon, the production cost is only 50 cents.

“If you want to make this device really useful, you can't rely on just those things like acetate. Although they are traditional raw materials that have been used, they are harmful to the environment. The acetic acid solution is often used in solar cells.” KAUST Prof. Mohammad Mustafa Hussain said: “What can be found in everyday life that can be used by humans? It is used in sub-Saharan Africa or It is precisely this kind of thinking on the battlefield that motivates us to conduct research and manufacture this type of fuel cell."

Professor Hussein and his team are currently studying how to increase the fuel cell's power. If the initial version of the fuel cell is a small sedan, the battery they are currently researching is a tough Land Rover.

In the latest battery, the three fuel cells are connected to each other, which greatly increases the power density and requires only more saliva. He said that the saliva fuel cell can already drive a series of small devices such as diabetes testers and pregnancy test indicators.

But saliva is not the only target that material research scientists aim at. It is said that Dr. Hussein is also studying how to use tea to generate electricity, and talks with several Greek yoghurt companies about how to use the wastewater produced by making yogurt.

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