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Using Solar to Convert CO2 to Fuel Precursors
May 2, 2017 | Leave a Comment
Professor Uribe-Romo and the UV CO2 breakdown device in the lab. Image Credit: Bernard Wilchusky, University of Central Florida. Click image for the largest view.
His team created a way to trigger a chemical reaction in a synthetic material called metal-organic frameworks (MOF) that breaks down carbon dioxide into harmless organic materials, formate and formamides. Think of it as an artificial photosynthesis process similar to the way plants convert carbon dioxide and sunlight into food. But instead of producing food, Uribe-Romo’s method produces solar fuel.
The process has great potential for creating a technology that could create a clean way to produce energy.
The findings of his research have been published in the Journal of Materials Chemistry A.
Professor Uribe-Romo said, “This work is a breakthrough. Tailoring materials that will absorb a specific color of light is very difficult from the scientific point of view, but from the societal point of view we are contributing to the development of a technology that can help reduce greenhouse gases.”
Recycling carbon from the atmosphere is something scientists around the world have been pursuing for years, but the challenge is finding a way for visible light to trigger the chemical transformation. Ultraviolet rays have enough energy to allow the reaction in common materials such as titanium dioxide, but ultraviolet rays make up only about 4 percent of the light Earth receives from the sun. The visible range – the violet to red wavelengths – represent the majority of the sun’s rays, but there are few materials that pick up these light colors to create the chemical reaction that transforms CO2 into fuel.
Researchers have tried it with a variety of materials, but the ones that can absorb visible light tend to be rare and expensive materials such as platinum, rhenium and iridium that make the process cost-prohibitive.
Uribe-Romo used titanium, a common nontoxic metal, and added organic molecules that act as light-harvesting antennae to see if that configuration would work. The light harvesting antenna molecules, called N-alkyl-2-aminoterephthalates, can be designed to absorb specific colors of light when incorporated in the MOF. In this case he synchronized it for the color blue.
His team assembled a blue LED photoreactor to test out the hypothesis. Measured amounts of carbon dioxide were slowly fed into the photoreactor – a glowing blue cylinder that looks like a circular tanning bed – to see if the reaction would occur. The glowing blue light came from strips of LED lights inside the chamber of the cylinder and mimic the sun’s blue wavelength.
It worked and the chemical reaction transformed the CO2 into two reduced forms of carbon, formate and formamides (two kinds of solar fuel) and in the process taking CO2 from the air.
“The goal is to continue to fine-tune the approach so we can create greater amounts of reduced carbon so it is more efficient,” Uribe-Romo said.
Uribe-Tomo wants to see if the other wavelengths of visible light may also trigger the reaction with adjustments to the synthetic material. If it works, the process could be a significant way to help reduce greenhouse gases and produce fuel feedstock supplies.
“The idea would be to set up stations that capture large amounts of CO2, like next to a power plant. The gas would be sucked into the station, go through the process and recycle the CO2 while producing fuel that would be put back into the power plant.”
Perhaps someday homeowners could purchase rooftop shingles made of the material, which would clean the air in their neighborhood while producing energy that could be used to power their homes.
“That would take new technology and infrastructure to happen,” Uribe-Romo said. “But it may be possible.”
This is an ingenious solution. Perhaps others will see the practicality, use other energy inputs than solar, and really put some legs under this discovery. Its a discovery that is certain to gain importance over time.
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