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Chinese Develop Sweat Powered Batteries

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As the world rushes to transition to a new energy economy, researchers are uncovering novel methods to harvest energy from mundane, everyday sources. A research team in China has created a new battery that could be safely used in wearable or implantable devices, thanks to its use of salt-based electrolytes. This breakthrough could drastically improve the quality and safety of battery-dependent medical technology and may even pave the way for sweat-powered devices.

In order to be effective, implantable or wearable batteries need to be flexible to allow functional bending on organic surfaces. In prior iterations, these batteries usually included a mix of toxic chemicals that serve as the electrolytes through which electrical charge can flow. 

This new battery uses non-harmful electrolytes such as sodium sulfate and saline. Because there is less of a concern regarding leakage of these chemicals, the battery’s design does not require extra material to protect humans from exposure and is significantly less bulky.

One particularly interesting implication of a salt-based battery is the idea that the batteries could prove effective at harvesting sweat and other salty bodily fluids to power a workout assistant device. The researchers also noted that the batteries have a marked ability to convert dissolved oxygen into hydroxide ions, which could prove useful in medical applications. 

“We can implant these fiber-shaped electrodes into the human body to consume essential oxygen, especially for areas that are difficult for injectable drugs to reach,” said researcher Yonggang Wang. “Deoxygenation might even wipe out cancerous cells or pathogenic bacteria since they are very sensitive to changes in living environment pH. Of course, this is hypothetical right now, but we hope to investigate further with biologists and medical scientists.”

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