In the near future, mobile devices will be able to recharge from Wi-Fi networks

Wireless charging technology has little difference in efficiency from conventional charging technology. The charging gadget must always be in contact with the charger.  At the same time, the space around us is literally overflowing with unnecessary radiation, which is an energy source.

A team of MIT researchers presented blueprints and schematics for a system that can capture energy from various electronic devices, including Wi-Fi signals, and use it to charge other devices.

The device developed at MIT is called a terahertz rectifier.  It consists of a small square graphene with a layer of boron nitride (BN) underneath it and with antennas on either side.  The antenna captures the radiation of the terahertz range, capturing the signals passing through graphene, which in turn causes the electrons in graphene to move in one direction, creating a direct electric current.

According to researchers, graphene in this case must be as clean as possible, because any impurities dissipate the flow of electrons. The boron nitride layer prevents this. Usually, electrons in graphene are evenly distributed in all directions, but the atoms of boron and nitrogen in the blocking layer accumulate them in one direction.

It is quite possible that a tarrahertz rectifier will have a small capacity to meet the energy needs of only small devices - at first, it may be electronic implants (for example, pacemakers).

The ultimate goal of the MIT team's development is to create a technology that will ensure that mobile devices are passively recharged while in use.

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