Breakthrough: Mini device converts molecular movement into electricity
Energy is a critical component of modern human civilization, supplying electricity to houses, factories, and transportation. As the world’s population and demands grow, sustainable energy sources and efficient use become critical for the long-term future.
In a major development, a tiny device has harnessed the motion of molecules in room-temperature liquid to generate electricity.
This innovative technological solution promises to create a clean and readily available energy source for low-power devices, entirely self-sufficient and not reliant on any external energy sources.
As per the New Scientist report, this device may find applications in energizing items such as tiny medical implants and even small household gadgets in the future.
The device was able to generate a small amount of current
Molecules are constantly in motion because they have thermal energy — even when they seem stationary to our eyes.
For instance, even though a glass of water appears to be still, the individual water molecules continually vibrate and clash with one another, resulting in this seemingly undetectable motion. This underlying molecular mobility is a basic property of matter at every temperature above absolute zero.
“We thought it would be interesting and meaningful to see if this motion can be harvested and converted into electricity,” Wei Li at Nankai University in China told New Scientist.
The study team created a small energy-harvesting device that is only one square centimeter, called a molecular thermal motion harvester (MTMH).
This device has two electrodes, one on top and one on the bottom, each having several 25-nanometer-wide strands of zinc oxide attached to it. Reportedly, zinc oxide was chosen as the material because of its ability to generate an electrical charge when mechanically deformed.
The harvesting device was then placed in a container filled with n-octane – a hydrocarbon comparable to propane or butane but with a longer chain of carbon and hydrogen atoms. This process occurred at room temperature.
The experiment results indicated that when the molecules in the liquid came into contact with the microscopic zinc oxide strands, they generated a small voltage of 2.28 millivolts and a current of 2.47 nanoamperes.
“The energy of the thermal motion of octane can be converted into electrical energy through the device based on the piezoelectric properties of ZnO and a nano-array structure,” mentioned the study.
The team also aims to examine whether different solvents or liquids can efficiently serve as power sources for this device.
The researchers believe the gadget might provide energy for nano-scale devices such as implants for medicine delivery and therapeutic purposes.
The team hopes to advance this technology further to power more complex applications with high efficiency.
Source: Interesting Engineering
Breakthrough: Mini device converts molecular movement into electricity