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New speed record for electric vehicles

26.10.2014

Australian students, part of the Sunswift group, have set a record for the average speed of an electric vehicle over a distance of 500 km. The achievement is officially recorded by the International Automobile Association (Federation Internationale de l'Automobile).

Students at the University of New South Wales (UNSW) in Australia have developed an electric car called the eVe, which can cover 500 km on a single battery charge, reaching an average speed of 107 km/h. The previous record, recorded 26 years ago, is 73 km/h.

The Sunswift eVe has solar panels on the roof that feed the batteries with additional energy. During record fixing, these panels were disabled. Thanks to the use of solar cells, the eVe electric range can be up to 800 km.

A full charge of the batteries, whose total weight is 60 kg, from the household power supply takes about 8 hours. At a speed of 100 km/h, the energy consumption is only 20 kWh. For comparison, the Tesla Model S consumes 67 kWh at a speed of 89 km/h.

The creators of Sunswift eVe hope to make the developed electric car a commercial product in 2015. Until then, the developers promise to refine the car, including reducing charging time, increasing range, and also improving the interior of the car, making it traditional.

Meanwhile, it became known about the development of Italy's first electric supercar. The design of the novelty is carried out by the local company Tecnicar, which manufactures small motorcycles and tourist electric locomotives.

The sports car will be called Lavinia and will have a power plant with a capacity of about 800 hp. It will provide the car with a maximum speed of 300 km / h and acceleration from 0 to 100 km / h in 3,5 seconds. It is assumed that the electric supercar will be able to cover a distance of 290 km without recharging.

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Efficient quantum dot solar panels 11.11.2012

Scientists from the National Renewable Energy Laboratory (NREL, USA) have demonstrated the high efficiency of quantum dot solar panels. Using a process called multiple exciton generation (MEG), the researchers created a solar panel in which each blue photon of absorbed light can generate 30% more electricity than conventional technology.

New solar cells will soon be able to surpass all existing commercial photovoltaic technologies. The new cell demonstrates a high external quantum efficiency (EQE) - more than 100% for photons in the solar spectrum. It should be noted that EQE is not efficiency, but the ratio of hole-electron pairs to the number of photons that hit the solar panel. In turn, the internal efficiency is the ratio of the number of absorbed photons and produced electrons.

So far, no photovoltaic cell has ever approached 100% EQE. Traditional semiconductors produce only one electron from each photon, the rest of the energy is dissipated as heat. At the same time, crystalline nanometer structures such as quantum dots circumvent this limitation, resulting in reduced energy loss and increased electricity output. Due to their microscopic size, quantum dots limit the movement of electrons and do not allow energy to dissipate, which makes it possible to maximize the utilization of photon energy.

The MEG technology uses most of the photon energy efficiently and achieves an EQE of 114%. This allows us to talk about the possibility of creating full-scale solar panels based on quantum dots, which will be significantly more powerful than similar panels based on traditional semiconductors. While the efficiency of the experimental cell is low - only 4,5%. However, this is just a lab sample meant to demonstrate the effect of MEG, not power generation. Scientists believe that in the future, quantum dot solar panels will significantly surpass traditional ones in terms of power and become an environmentally friendly source of new generation energy.

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