New Smartwatch Technology Could Generate Power from Body Heat
Researchers have developed a new flexible material capable of converting human body heat into electricity, a breakthrough that could eventually provide an alternative power source for smartwatches and other wearable devices.
The material was created by scientists at the Institute of Chemistry of the Chinese Academy of Sciences, according to a report published in Science. If successfully adapted for consumer electronics, the technology could reduce reliance on traditional batteries in wearable devices.
Converting Heat into Electricity
The newly developed material is based on a flexible polymer structure designed to improve thermoelectric performance. Thermoelectric materials generate electrical energy from temperature differences. In the case of wearable devices, this difference comes from the contrast between body heat and the surrounding environment.
The researchers designed the material with a hierarchical porous structure. To achieve this, a polymer was mixed with a specialised separation agent that was later removed during the manufacturing process. Once the agent was extracted, a network of microscopic and nanoscale pores remained inside the material.
This porous architecture reduces the transfer of heat within the material itself, which helps maintain the temperature gradient needed for efficient thermoelectric generation.
Improved Efficiency Through Material Structure
According to the research team, the new structure reduces internal heat loss by approximately 72 percent. At the same time, the configuration encourages a more orderly alignment of the polymer molecules.
This molecular arrangement improves the movement of electrical charges within the material and increases its electrical conductivity by around 25 percent.
During laboratory testing, the resulting film demonstrated a thermoelectric efficiency value of 1.64 at a temperature of roughly 70°C, indicating promising performance for flexible energy harvesting applications.
Potential Applications in Wearable Devices
The researchers suggest that the material could be used in smartwatches and other wearable electronics as a supplementary energy source. Devices that continuously generate small amounts of electricity from body heat may require less frequent charging or potentially operate for longer periods between charges.
Another important advantage is manufacturability. The material can be produced at larger scales using spray based fabrication techniques similar to printing, which could simplify future industrial production.
While the technology remains at a research stage, it highlights how advances in materials science could influence the next generation of wearable devices, including smartwatches that rely less on conventional battery systems.
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