This Biofuel Cell Harvests Energy From Your Sweat

Researchers from l’Université Grenoble Alpes and the University of San Diego recently developed and patented a flexible device that’s able to produce electrical energy from human sweat. The lactate/O2 biofuel cell has been demonstrated to light an LED, leading to further development in the area of harvesting energy through wearables.

[via Advanced Functional Materials]
The research was published in Advanced Functional Materials on September 25, 2019. The potential use cases for this type of biofuel cell within the wearables space include medical and athletic monitoring. By using biofuels present in human fluids, the devices can rely on an efficient energy source that easily integrated with the human body.

Scientists have developed a flexible conductive material made up of carbon nanotubes, cross-linked polymers, and enzymes connected to each and printed through screen-printing. This type of composite is known as a buckypaper, and uses the carbon nanotubes as the electrode material.

The lactate oxidase works as the anode and the bilirubin oxidase (from the yellowish compound found in blood) as the cathode. Given the theoretical high power density of lactate, this technology has the potential to produce even more power than its current power generation of 450 µW.

[via Advanced Functional Materials]
The cell follows deformations in the skin and produces electrical energy through oxygen reduction and oxidation of the lactate in perspiration. A boost converter is used to increase the voltage to continuously power an LED. The biofuel cells currently delivered 0.74V of open circuit voltage. As measurements for power generation had to be taken with the biofuel cell against human skin, the device has shown to be productive even when stretched and compressed.

At the moment, the biggest cost for production is the price of the enzymes that transform the compounds in sweat. Beyond cost considerations, the researchers also need to look at ways to increase the voltage in order to power larger portable devices.

With all the exciting research surrounding wearable technology right now, hopefully we’ll be hearing about further developments and applications from this research group soon!

[Thanks to Qes for the tip!]

12 thoughts on “This Biofuel Cell Harvests Energy From Your Sweat

  1. This has got to be the least efficient way for humans to generate electricity. Lactate based fuel cells might make sense under certain conditions, but not as a way for humans to generate meaningful amounts of electricity using sweat.

    1. Seems more like something that was just an exercise in engineering vs anything that could be practical.
      You’d harvest a lot more energy with a weight and a spring in a tube or putting peizo electric material in the insoles.

  2. For energy harvesting from humans, it’s unlikely that any one strategy will generate enough. The thought isn’t to use just this fuel cell, or just piezo- or thermalelectrics. It’s an all of the above strategy. Get a trickle of current from each source we can find and maybe just maybe we can have enough to power something useful.

    1. The human body is very inefficient, all that energy is coming from expensive human food and the vast resources required to produce it. Quite literally any other source of energy would be more efficient. You can probably generate more energy by literally burning the cash you would have spent on this gear.

      1. What do you mean the human body is very inefficient? Do you have anything to back up that claim? I would have thought that the human body is extremely efficient and uses or stores practically all the energy available from the food we eat.

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