Dalian Institute of Chemical Physics, Chinese Academy of Sciences has achieved a major breakthrough in artificial hydrogen production technology
The development of sustainable, high-efficiency scale hydrogen production technology has become an urgent demand in the era of “hydrogen economyâ€â€”hydrogen energy density is high, clean and environmentally friendly, and the generated water after burning has no pollutants, and is an ideal energy carrier; Hydrogen energy is compatible and compatible with existing energy systems. It can be easily and efficiently converted to electricity or heat and has high conversion efficiency. Hydrogen can also be converted into bulk chemicals such as methanol or ammonia, which has attracted great attention from the industry. As the hydrogen energy utilization technology matures, it is expected to replace the “hydrogen economy†era of the existing petroleum economic system and is approaching us gradually through breakthroughs in one related technology.
Recently, the German Journal of Applied Chemistry published a major breakthrough in collaboration between scientists from Japan and Japanese scientists. The efficiency of the new artificial hydrogen production technology has reached the highest in the world.
Academician Li Can of Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Zhang Fuxiang, Ph.D., and Chen Shanshan, Ph.D., etc., teamed up with Professor Domen Kazunari's group to discover that MgTa2O6 xNy/TaON heterojunction synthesized in one step of nitriding. The material can effectively promote photo-induced charge separation. Based on this heterojunction material, they simulated the principle of natural photosynthesis and successfully realized the complete decomposition of water to hydrogen using the “Z†mechanism. The apparent quantum efficiency of hydrogen production at the wavelength of 420 nm under visible light excitation was as high as 6.8%. The highest.
The use of sunlight to decompose water into hydrogen has long been regarded as the "chemical holy grail." The photocatalytic decomposition of water to hydrogen is one of the ideal ways to fundamentally solve the energy crisis and environmental pollution, and the development and application of broad spectrum-responsive semiconductor materials are the premise and basis for the efficient photochemical conversion of solar energy. Previously, Academician Li Can, researcher Zhang Fuxiang, and Ph.D. student Chen Shanshan have long been aiming at a hydrogen-enriched hydrogen-responsive semiconductor material that has the potential for solar energy applications. Starting from the development of new materials, they achieved effective broad-spectrum absorption and utilization of nitrogen-doped semiconductor materials in a series of layered or tunnel-shaped wide band gap semiconductors, and experimentally confirmed that such novel semiconductor materials have visible light catalysis. Decompose water to make hydrogen potential.
The new heterojunction materials used in this study are based on the new MgTa2O6 xNy materials independently developed by the team and successfully built through the innovation of the nitriding synthesis strategy.
"The research results not only provide a new method for the construction of 'heterojunction', but also open up the chain from the development of new materials to the production of artificial decomposition of photodegradable water to hydrogen, and the development of high-efficiency wide-spectrum visible light artificial photosynthesis hydrogen generation energy for the development of independent innovation in China. Sexual technology lays the foundation." Industry experts said when evaluating the results.
Solar energy is the richest source of clean energy. Water is one of the most abundant natural resources on the planet. The total amount of solar radiation received in the world is as high as 120,000 TW per year, which is nearly 10,000 times that of the current global human energy consumption. The total annual solar radiation received by China’s land area is equivalent to more than 2 trillion tons of standard coal, which belongs to solar energy. Resource-rich countries. Therefore, if solar photocatalysis can be used to decompose water into hydrogen, the issue of sustainable energy development based on hydrogen energy will be fundamentally solved. Once this technology is broken, it will change the world energy pattern, and it has immeasurable significance for China's national security, ecological civilization, social construction and sustainable economic and social development.
Dalian Institute of Chemical Industry is one of the earliest institutions engaged in research on artificial photosynthetic hydrogen production in China. Academician Li Can initiated research on artificial photosynthetic hydrogen production in 2001 and conducted extensive explorations in the basic research of artificial photosynthetic hydrogen production. The research results provided a new strategy and design idea for the construction of an efficient solar photo-chemical conversion system and was obtained domestically. External peer experts have received extensive attention. (Reporter Yan Huimin)
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