New solar coating heat and light conversion rate of 90%

“We want to create a material that allows sunlight to escape. You can call it a 'sunlight black hole',” said Jin Songhe, professor of mechanical and aerospace engineering at the Jacobs School of Engineering at the University of California, San Diego. . A multidisciplinary engineering team at the university has developed a new type of nanomaterial that captures solar energy up to 90% of its efficiency into heat, not only that, but also withstands temperatures of up to 700 degrees Celsius, exposure to air and humidity in unpredictable outdoor environments It can still be used for many years. The study was funded by the US Department of Energy's "Shooting Japan" project. The relevant results were published in the latest edition of "Nano Energy" magazine.

At present, the Concentrating Solar Power System (CSP) is gradually occupying the market as an emerging alternative clean energy production technology. The total amount of power generated in the world reaches 3.5 billion watts, and it can meet the electricity demand of 2 million households. It is expected that in the future It will increase to about 20 billion watts in a few years. The biggest highlight of this technical system is that it can use coal or natural gas power stations that have already been put into operation, because it also needs the same steam power to produce electricity.

According to the report of the Physicist Organization Network on October 29th, one of the most common concentrating solar power systems requires the use of 100,000 reflectors to concentrate sunlight on a tower coated with black light-absorbing material. However, current solar heat sinks can only work in lower temperature environments, and almost every year they need to cut out the aged light-absorbing material and replace it with a new coating “coat.” The power station should be closed once a year. For overhaul, it means that it is impossible to continue generating electricity during this period.

The San Diego team of experts has been developing and optimizing a new material for this system for the past 3 years. It is characterized by a “multi-scale” surface formed by a large number of different sized particles ranging from 10 nm to 10 μm. The new coating is used for a long time and ensures efficient energy conversion in high temperature environments. They are confident that the results have basically met the expectations of the US Department of Energy and can be applied on a large scale to solar power plants.

It is understood that the U.S. Department of Energy initiated the “Shooting Japan” project in 2010 and hopes that by 2020, the cost of solar power generation will be reduced to have sufficient market competitiveness. (Fang Linlin)

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