Scientists Get Closer to Artificial Photosynthesis for Renewable Energy

Scientists at Berkeley Lab are getting close to a long-held goal of using artificial photosynthesis to generate renewable energy from the carbon dioxide in our atmosphere. If produced in large enough quantities, the energy created from artificial photosynthesis could be a huge step to slowing climate change.

Photosynthesis is the chemical reaction by which algae and green plants turn carbon dioxide into cellular fuel. Scientists at Berkeley have designed square solar fuel tiles containing billions of nanoscale tubes between two pieces of thin, flexible silicate. These squares will comprise the new artificial photosynthesis system.

The Berkeley scientists recently published a paper in Advanced Functional Materials explaining how their design “allows for the rapid flow of protons from the interior space of the tube, where they are generated from splitting water molecules, to the outside, where they combine with CO2 and electrons to form the fuel.” So far, the scientists have managed to produce carbon monoxide as the fuel but are trying for methanol.

“There are two challenges that have not yet been met,” said senior scientist Heinz Frei in a press release from Berkeley Lab. “One of them is scalability. If we want to keep fossil fuels in the ground, we need to be able to make energy in terawatts — an enormous amount of fuel. And, you need to make a liquid hydrocarbon fuel so that we can actually use it with the trillions of dollars’ worth of existing infrastructure and technology.”

Once the scientists are satisfied with their model, they should be able to quickly build a solar fuel farm out of the tiles, which measure a few inches across. “We, as basic scientists, need to deliver a tile that works, with all questions about its performance settled,” Frei said. “And engineers in industry know how to connect these tiles. When we’ve figured out square inches, they’ll be able to make square miles.”