According to the US Daily Science website on December 16 (Beijing time), scientists from China and the US have joined hands to use cobalt oxide nanoparticles as the catalyst for the first time using visible light to rapidly decompose water into hydrogen and oxygen, which is simple and fast and energy conversion efficiency. Higher. The relevant research was published on the online version of Nature Nanotechnology magazine published on Sunday.
The research leader, Bao Jiming, an associate professor at the School of Electronics and Computer Engineering at the University of Houston, said that while more research is needed, new research has discovered cobalt oxide, a new photocatalyst, and demonstrated that nanotechnology is changing. The potential for material properties. Scientists from Sam Houston State University, Chinese Academy of Sciences, Sichuan University, and Texas State University also participated in the study.
Bao Jiming said that since the 1970s, scientists have been using a variety of photocatalysts for water separation experiments. The new experiment was the first time that scientists used cobalt oxide and decomposed neutral water under visible light for the first time. The energy conversion efficiency was also high, and no other catalyst was needed.
They used the femtosecond laser ablation method and the mechanical ball milling method to prepare the nanoparticles. The nanoparticles obtained by the two methods performed as well in the experiment. They also used a variety of different light sources—from lasers to simulated sunlight—and thought that using natural sunlight, the results would be equally good.
Bao Jiming said that once the nanoparticles are added to the reaction and irradiated with light, the water will be decomposed into hydrogen and oxygen almost immediately. The volume of hydrogen obtained is twice that of oxygen, and the composition ratio of hydrogen to oxygen in water (H2O). same.
The study, which is expected to provide people with renewable fuels, still needs further improvement. Bao Jiming pointed out that in the latest experiment, the solar-hydrogen conversion efficiency is about 5%, and the conversion efficiency is about 10% suitable for commercial production.
Moreover, there are other issues that need to be addressed, including reducing costs and extending the life of cobalt oxide nanoparticles. Scientists have found that cobalt oxide loses its activity substantially after approximately one hour of reaction. They will continue to answer key questions and further clarify the chemical and electrical properties of cobalt oxide. (Reporter Liu Xia)
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