University of Science and Technology professor invented palladium catalyst is expected to significantly increase photovoltaic efficiency

For a long time, photovoltaic energy conversion methods using solar thermal energy have always faced the problem of thermal energy conversion and catalytic effect is not strong. Chinese scientists have recently solved this problem effectively by using palladium catalysts.

According to a report from the China University of Science and Technology News Network on the 3rd, a metal palladium nanostructured catalyst was invented by the research group of Professor Xiong Yujie of the Chinese University of Science and Technology. The catalyst has high catalytic activity and solar energy utilization characteristics, and can achieve catalytic conversion under a room temperature spectrum irradiation at a temperature of 70 degrees Celsius. With regard to efficiency, this progress offers the possibility of using solar energy as a substitute for heat sources to drive organic catalytic reactions. This result has been published in the famous academic journal "German Applied Chemistry".

According to the article, given the overexploitation of fossil fuels and their gradual depletion, the orientation of solar energy to chemical energy has attracted widespread attention in the industry. The traditional way of using solar energy to drive chemical reactions is based on semiconductor photocatalytic technology. However, semiconductor materials do not have high catalytic activity and selectivity for many organic reactions. To solve this problem, material chemists proposed the idea of ​​realizing organic catalytic reactions by combining the catalytic activity and optical properties of metals, which is expected to replace traditional thermal catalysis methods.

Palladium metal is a highly efficient catalyst. However, compared with common gold and silver, its nanostructure has a small local absorption surface cross section, and its response spectral range is limited to the ultraviolet wavelength, which brings great difficulties to solar energy utilization. To address this challenge, Xiong Yujie's research group designed a palladium nanocrystal with a concave structure. By reducing the symmetry of the structure and increasing the particle size, it can absorb light in a wide spectrum of visible light. The photothermal effect after light absorption is sufficient. Provides heat for organic catalytic reactions. The uniqueness of this design lies in the fact that the nano-structures have superb light-gathering ability at the corners and corners to generate localized high temperatures. At the same time, the corners and corners are also the highly active sites for catalytic reactions, enabling the spatial distribution of solar energy utilization and catalytic activity. Combined into one.

At the same time, the spot price of palladium on the international market has regained momentum after a quiet period of six months. On March 3rd, spot palladium prices rose for the sixth consecutive trading day and closed at $829.97 per ounce, setting a new high since September 18 last year. Since 20 February, the price of palladium has risen by 6.38%, which is only 9% from the highest point in nearly 15 years. As the world’s largest palladium producer, Russia, is unstable, the global palladium supply is tight, and the demand for palladium from major auto makers is strong, making the palladium price stronger recently. At the same time, benefiting from India’s tax cuts, the world’s largest gold consumer, India’s purchase of overseas gold in March reached 100 tons, which was significantly higher than the 25 tons in February, and drove up the price of international precious metals. US investment firm Jefferies believes that the price rebound of palladium will continue before the release of non-farm payrolls in the United States.

Among A-share companies, Western Materials is mainly engaged in the processing of rare metal materials, and has 11 patents relating to the production and production of rare metal composite materials and products, metal fibers and products, and refractory metal products, and has been involved in palladium processing. Zhuzhou Metallurgical Group specializes in smelting, purchasing, and processing of non-ferrous metal products, mineral products and their by-products. The integrated recycling business involves palladium. Yi Ya Tong's main purchase and sales of palladium, the company's holding subsidiary Yongxing Yixing Rare and Precious Metals Supply Chain Co., Ltd.'s business scope is based on rare metal procurement, storage, processing.

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