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Novel device creates electricity from snowfall

Scientists have designed a first-of-its-kind 3D-printed device that can produce electricity from falling snow.

The device designed by researchers at the  University of California, Los Angeles (UCLA)
in the US is inexpensive, small, thin and flexible like a sheet of plastic.

“The device can work in remote areas because it
provides its own power and does not need batteries,” said UCLA’s Richard
Kaner, senior author of the research published in the journal Nano Energy.

“It’s a very clever device — a weather station that
can tell you how much snow is falling, the direction the snow is falling, and
the direction and speed of the wind,” Kaner said in a statement.

 The device called
snow-based triboelectric nanogenerator, or snow TENG, generates charge through
static electricity, produces energy from the exchange of electrons.

“Static electricity occurs from the interaction of one
material that captures electrons and another that gives up electrons,”
said Kaner.

“You separate the charges and create electricity out of
essentially nothing,” he said.

Snow is positively charged and gives up electrons.

Silicone — a synthetic rubber-like material that is
composed of silicon atoms and oxygen atoms, combined with carbon, hydrogen and
other elements — is negatively charged.

When falling snow contacts the surface of silicone, it
produces a charge that the device captures, creating electricity.

“Snow is already charged, so we thought, why not bring
another material with the opposite charge and extract the charge to create
electricity” said Maher El-Kady, a UCLA postdoctoral researcher.

“While snow likes to give up electrons, the performance
of the device depends on the efficiency of the other material at extracting
these electrons,” he added.

After testing a large number of materials including aluminum
foils and Teflon, the researchers found that silicone produces more charge than
any other material.

About 30 per cent of the Earth’s surface is covered by snow
each winter, during which time solar panels often fail to operate, El-Kady
noted.

The accumulation of snow reduces the amount of sunlight that
reaches the solar array, limiting the panels’ power output and rendering them
less effective.

The new device could be integrated into solar panels to
provide a continuous power supply when it snows, he said.

The device can be used for monitoring winter sports, such as
skiing, to more precisely assess and improve an athlete’s performance when
running, walking or jumping, Kaner said.

It could usher in a new generation of self-powered wearable
devices for tracking athletes and their performances, researchers said.

The device can also send signals, indicating whether a
person is moving. It can tell when a person is walking, running, jumping or
marching, they said.

The team used 3D printing to design the device, which has a
layer of silicone and an electrode to capture the charge.

The researchers believe the device could be produced at low
cost given “the ease of fabrication and the availability of
silicone,” Kaner said.

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