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Pioneering Tech Turns Sunlight And CO2 Into Renewable Fuel

August 4, 2023
in General
Pioneering Tech Turns Sunlight And CO2 Into Renewable Fuel
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Researchers from the University of Cambridge have developed a solar-powered technology, called “artificial leaves,” which can convert carbon dioxide and water into high energy density fuels such as ethanol and propanol in a single step.
Unlike biofuels and fossil fuels, these solar fuels do not contribute to carbon emissions and do not require agricultural land for their production, offering a renewable and net zero carbon solution.
The technology is still in its early stages, with the team currently working on enhancing the device’s efficiency, optimizing its ability to absorb sunlight and increase fuel production, and scaling up the device to enable large volumes of fuel production.

University of Cambridge researchers have developed a solar-powered technology that converts carbon dioxide and water into liquid fuels that can be added directly to a car’s engine as drop-in fuel.

The researchers report on the new technology in Nature Energy.

The researchers harnessed the power of photosynthesis to convert CO2, water and sunlight into multicarbon fuels – ethanol and propanol – in a single step. These fuels have a high energy density and can be easily stored or transported.

Unlike fossil fuels, these solar fuels produce net zero carbon emissions and completely renewable, and unlike most bioethanol, they do not divert any agricultural land away from food production.

While the technology is still at laboratory scale, the researchers say their ‘artificial leaves’ are an important step in the transition away from a fossil fuel-based economy.

Bioethanol is touted as a cleaner alternative to petrol, since it is made from plants instead of fossil fuels. Most cars and trucks on the road today run on petrol containing up to 10% ethanol (E10 fuel). The United States is the world’s largest bioethanol producer: according to the U.S. Department of Agriculture, almost 45% of all corn grown in the US is used for ethanol production.

Professor Erwin Reisner, who led the research noted, “Biofuels like ethanol are a controversial technology, not least because they take up agricultural land that could be used to grow food instead.”

For several years, Reisner’s research group, based in the Yusuf Hamied Department of Chemistry, has been developing sustainable, zero-carbon fuels inspired by photosynthesis – the process by which plants convert sunlight into food – using artificial leaves.

To date, these artificial leaves have only been able to make simple chemicals, such as syngas, a mixture of hydrogen and carbon monoxide that is used to produce fuels, pharmaceuticals, plastics and fertilisers. But to make the technology more practical, it would need to be able to produce more complex chemicals directly in a single solar-powered step.

Now, the artificial leaf can directly produce clean ethanol and propanol without the need for the intermediary step of producing syngas.

The researchers developed a copper and palladium-based catalyst. The catalyst was optimized in a way that allowed the artificial leaf to produce more complex chemicals, specifically the multicarbon alcohols ethanol and n-propanol. Both alcohols are high energy density fuels that can be easily transported and stored.

Other scientists have been able to produce similar chemicals using electrical power, but this is the first time that such complex chemicals have been produced with an artificial leaf using only the energy from the Sun.

Dr Motiar Rahaman, the paper’s first author offered more details, “Shining sunlight on the artificial leaves and getting liquid fuel from carbon dioxide and water is an amazing bit of chemistry. Normally, when you try to convert CO2 into another chemical product using an artificial leaf device, you almost always get carbon monoxide or syngas, but here, we’ve been able to produce a practical liquid fuel just using the power of the Sun. It’s an exciting advance that opens up whole new avenues in our work.”

At present, the device is a proof of concept and shows only modest efficiency. The researchers are working to optimize the light absorbers so that they can better absorb sunlight and optimizing the catalyst so it can convert more sunlight into fuel. Further work will also be required to make the device scalable so that it can produce large volumes of fuel.

“Even though there’s still work to be done, we’ve shown what these artificial leaves are capable of doing,” said Reisner. “It’s important to show that we can go beyond the simplest molecules and make things that are directly useful as we transition away from fossil fuels.”

The research was supported in part by the European Commission Marie Sk?odowska -Curie Fellowship, the Cambridge Trust, and the Winton Program for the Physics of Sustainability. Erwin Reisner is a Fellow and Motiar Rahaman is a Research Associate of St John’s College, Cambridge.

***

The artificial leaf technology is quite a wide array of ideas using solar energy to perform or drive reactions. Going from carbon dioxide and water to a fuel seems like a great idea.

There is a lot to work out. While getting the water and CO2 in proximity isn’t difficult, getting the conditions right might be. Proportions, temperatures, contaminates, energy input levels and other incident parameters all have to be worked out and then manufacture leaves that make economic sense.

It very likely can be done and should be. But it was hundreds of millions of years ago nature figured out to store energy with hydrogen connected to carbon for useful molecules. Most of the big advancements have been set for a very long time. So far nature hasn’t turned up anything better.

That suggests this tech might be among the very best ideas. Lets hope development continues.

By Brian Westenhaus via New Energy and Fuel

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