![]() “The hydrogen ions diffuse through a membrane to the cathode side, to participate in the carbon dioxide reduction reaction,” said Asadi. #Video direct sunlight solarcell free#When light of 100 watts per square meter – about the average intensity reaching the Earth’s surface – energizes the cell, hydrogen and carbon monoxide gas bubble up from the cathode, while free oxygen and hydrogen ions are produced at the anode. The UIC artificial leaf consists of two silicon triple-junction photovoltaic cells of 18 square centimeters to harvest light the tungsten diselenide and ionic liquid co-catalyst system on the cathode side and cobalt oxide in potassium phosphate electrolyte on the anode side. “The combination of water and the ionic liquid makes a co-catalyst that preserves the catalyst’s active sites under the harsh reduction reaction conditions,” Salehi-Khojin said. The breakthrough, he said, was to use an ionic fluid called ethyl-methyl-imidazolium tetrafluoroborate, mixed 50-50 with water. “The active sites of the catalyst get poisoned and oxidized,” Salehi-Khojin said. The catalyst couldn’t survive the reaction. Other researchers have used TMDC catalysts to produce hydrogen by other means, but not by reduction of CO2. In fact, he said, the new catalyst is 1,000 times faster than noble-metal catalysts - and about 20 times cheaper. “The new catalyst is more active more able to break carbon dioxide’s chemical bonds,” said UIC postdoctoral researcher Mohammad Asadi, first author on the Science paper. The best of several catalysts they studied turned out to be nanoflake tungsten diselenide. Salehi-Khojin and his coworkers focused on a family of nano-structured compounds called transition metal dichalcogenides - or TMDCs - as catalysts, pairing them with an unconventional ionic liquid as the electrolyte inside a two-compartment, three-electrode electrochemical cell. “What we needed was a new family of chemicals with extraordinary properties,” he said.Īmin Salehi-Khojin (left), UIC assistant professor of mechanical and industrial engineering, and postdoctoral researcher Mohammad Asadi with their breakthrough solar cell that converts atmospheric carbon dioxide directly into syngas. Engineers have been exploring different catalysts to drive CO2 reduction, but so far such reactions have been inefficient and rely on expensive precious metals such as silver, Salehi-Khojin said. The ability to turn CO2 into fuel at a cost comparable to a gallon of gasoline would render fossil fuels obsolete.Ĭhemical reactions that convert CO2 into burnable forms of carbon are called reduction reactions, the opposite of oxidation or combustion. Syngas can be burned directly, or converted into diesel or other hydrocarbon fuels. While plants produce fuel in the form of sugar, the artificial leaf delivers syngas, or synthesis gas, a mixture of hydrogen gas and carbon monoxide. “Instead of producing energy in an unsustainable one-way route from fossil fuels to greenhouse gas, we can now reverse the process and recycle atmospheric carbon into fuel using sunlight,” he said. “The new solar cell is not photovoltaic - it’s photosynthetic,” says Amin Salehi-Khojin, assistant professor of mechanical and industrial engineering at UIC and senior author on the study. A solar farm of such “artificial leaves” could remove significant amounts of carbon from the atmosphere and produce energy-dense fuel efficiently. Unlike conventional solar cells, which convert sunlight into electricity that must be stored in heavy batteries, the new device essentially does the work of plants, converting atmospheric carbon dioxide into fuel, solving two crucial problems at once. A provisional patent application has been filed. The finding is reported in the July 29 issue of Science and was funded by the National Science Foundation and the U.S. Researchers at the University of Illinois at Chicago have engineered a potentially game-changing solar cell that cheaply and efficiently converts atmospheric carbon dioxide directly into usable hydrocarbon fuel, using only sunlight for energy. Simulated sunlight powers a solar cell that converts atmospheric carbon dioxide directly into syngas. ![]()
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