Graphene film will reliably protect against corrosion. Free Technical Library News

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Graphene film will reliably protect against corrosion

10.10.2012

Researchers from Monash University and Rice University published in the September issue of Carbon a recipe for the most reliable protection of metals from corrosion. It turns out that a graphene coating so thin it's invisible to the naked eye can make a metal 100 times more resistant to corrosion. This discovery has great potential to protect the metal even in harsh environments such as seawater.

Graphene is a microscopic layer of carbon atoms, which is already used, for example, in smartphones. The anti-corrosion properties of graphene have long been of interest to scientists, and, finally, American researchers were able to convincingly demonstrate them. In laboratory experiments, a thin graphene film was able to reliably protect a copper plate: graphene-coated copper resisted corrosion 100 times better than untreated copper. Until now, various experiments with graphene have given a similar indicator by 5-6 times, which in principle is also very good, but is not an acceptable alternative to conventional paint.

Using a technique known as chemical vapor deposition, researchers at Monash University and Rice University deposited garfen on copper at temperatures between 800 and 900 degrees. Corrosion resistance tests were carried out in salt water.

Currently, scientists are improving the method of applying graphene to metal. First of all, the temperature of the process must be lowered to make it commercially more attractive. Work is also underway to test the anti-corrosion effectiveness of the graphene coating on other metals. The discovery of scientists is of great importance for all spheres of human activity, since everything is subject to corrosion: from musical instruments to ocean ships and electronics.

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Innovative silicon supercapacitor 19.11.2013

The innovative supercapacitor design, created by material scientists at Vanderbilt University (USA) under the guidance of Assistant Professor Cary Pint, makes it possible to create photovoltaic cells capable of generating electricity around the clock and not only when the sun is shining.

It is claimed to be the first supercapacitor made entirely from silicon and along with the microelectronic circuit it powers. And it can be used in built-in mobile phone batteries that charge in seconds and last for weeks between charges.

Scientists believe it will be possible to build batteries from the excess silicon found in today's photovoltaic cells, sensors, mobile phones and many other electromechanical devices, reducing the cost of these devices.

"If you ask people to make a supercapacitor out of silicon, they'll tell you it's a crazy idea," said Carey Pint, an assistant professor in the department of mechanical engineering who led the study. "But we've discovered a simple way to do it."

Instead of storing energy in chemical reactions, as batteries do, supercapacitors store energy by collecting ions on the surface of a porous material. As a result, they have the ability to charge and discharge in minutes rather than hours, and last for several million cycles rather than the thousands of cycles that batteries can.

These properties have enabled supercapacitors made from activated carbon to capture several niche markets, such as storing the energy generated by regenerative braking systems in buses and electric vehicles and providing the surge current needed to regulate the blades of giant wind turbines as wind conditions change. Supercapacitors still lag behind lithium-ion batteries in terms of specific capacity, so they are still too bulky to power most consumer devices. However, they are developing rapidly.

"Building high-performance functional devices from nanoscale building blocks with any level of control proved to be quite a challenge. And once it was done, it proved difficult to repeat," explained Assistant Professor Cary Pint.

“Despite the excellent performance of the device that we got, our goal was not to create devices with record parameters,” Pint said. “The goal was to develop methods for creating integrated energy storage. Silicon is an ideal material to work with, because it is the basis for many modern technologies and devices. In addition, most of the silicon in existing devices remains unused due to the fact that it is very expensive and unprofitable to produce thin silicon substrates."

Pint's group is now using this approach to create an energy store that could be formed in excess material or on the back of photocells and sensors. Supercapacitors could store excess electricity generated by photovoltaic cells during the day and release it during peak hours in the evening.

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