A new, stable artificial photosynthesis device doubles the efficiency of harnessing sunlight to break apart both fresh and salt water, generating hydrogen that can then be used in fuel cells.
The device could also be reconfigured to turn carbon dioxide back into fuel.
Hydrogen is the cleanest-burning fuel, with water as its only emission. But hydrogen production is not always environmentally friendly. Conventional methods require natural gas or electrical power. The method advanced by the new device, called direct solar water splitting, only uses water and light from the sun.
“If we can directly store solar energy as a chemical fuel, like what nature does with photosynthesis, we could solve a fundamental challenge of renewable energy,” said Zetian Mi, a professor of electrical and computer engineering at the University of Michigan who led the research while at McGill University in Montreal.
Faqrul Alam Chowdhury, a doctoral student in electrical and computer engineering at McGill, said the problem with solar cells is that they cannot store electricity without batteries, which have a high overall cost and limited life.
The device is made from the same widely used materials as solar cells and other electronics, including silicon and gallium nitride (often found in LEDs). With an industry-ready design that operates with just sunlight and seawater, the device paves the way for large-scale production of clean hydrogen fuel.
Previous direct solar water splitters have achieved a little more than 1 percent stable solar-to-hydrogen efficiency in fresh or saltwater. Other approaches suffer from the use of costly, inefficient or unstable materials, such as titanium dioxide, that also might involve adding highly acidic solutions to reach higher efficiencies.
Mi and his team, however, achieved more than 3 percent solar-to-hydrogen efficiency. To reach this stable efficiency, the team built a nano-sized cityscape of gallium nitride towers that generated an electric field. The gallium nitride turns light, or photons, into mobile electrons and positively charged vacancies called holes. These free charges split water molecules into hydrogen and oxygen.
“When this specially engineered wafer is hit by photons, the electric field helps separate photogenerated electrons and holes to drive the production of hydrogen and oxygen molecules efficiently,” Chowdhury said.
At present, the silicon backing of the chip does not contribute to its function, but it could be doing more. The next step may be to use the silicon to help capture light and funnel charge carriers to the gallium nitride towers.
“Although the 3 percent efficiency might seem low, when put in the context of the 40 years of research on this process, it’s actually a big breakthrough,” Mi said. “Natural photosynthesis, depending how you calculate it, has an efficiency of about 0.6 percent.”
He adds that 5 percent efficiency is the threshold for commercialization, but his team is aiming for 20 or 30 percent efficiency.
Mi conducts similar research to strip carbon dioxide of its oxygen to turn the resulting carbon into hydrocarbons, such as methanol and syngas. This research path could potentially remove carbon dioxide from the atmosphere, like plants do.
“That’s the truly exciting part,” Mi said.
The Latest on: Artificial photosynthesis
via Google News
The Latest on: Artificial photosynthesis
Chemical storage of renewable energy
on May 17, 2018 at 3:32 pm
1 Joint Center for Artificial Photosynthesis and Materials Sciences Division, Lawrence Berkeley National Laboratory and Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA 94720, USA. 2 Department of Chemical ... […]
Photosynthesis involves a protein 'piston'
on May 17, 2018 at 2:13 pm
The team's findings may provide clues to allow optimization of artificial photosynthesis to obtain complex chemicals from carbon dioxide, water, and light. Osaka University. (2018, May 17). Photosynthesis involves a protein 'piston': International research ... […]
Chemists Develop Improved Method to Create Artificial Photosynthesis
on May 7, 2018 at 9:18 am
Newswise — A team of chemistry and chemical engineering researchers at the University of Arkansas has developed a method of creating materials for artificial photosynthesis that is more efficient and cost-effective than current methods. Plants use ... […]
Photosynthesis device makes hydrogen fuel more efficiently
on May 4, 2018 at 8:36 am
A new, stable artificial photosynthesis device doubles the efficiency of harnessing sunlight to break apart both fresh and salt water, generating hydrogen for use in fuel cells. Researchers could also reconfigure the device to turn carbon dioxide back into ... […]
Artificial photosynthesis offers clean source of hydrogen
on May 4, 2018 at 4:16 am
The idea of a hydrogen economy, where currently oil and its derivatives underpin much of every day life but could be superseded using hydrogen as a fuel, has been around for decades. It is delayed, however, by two factors: the lack of a distribution ... […]
If sea slugs take ‘eternal energy’ from algae, can we?
on May 3, 2018 at 6:23 pm
“The broader implication is in the field of artificial photosynthesis. That is, if we can figure out how the slug maintains stolen, isolated plastids to fix carbon without the plant nucleus, then maybe we can also harness isolated plastids for eternity ... […]
Harvesting clean hydrogen fuel through artificial photosynthesis -- ScienceDaily
on May 3, 2018 at 4:16 pm
Hydrogen is the cleanest-burning fuel, with water as its only emission. But hydrogen production is not always environmentally friendly. Conventional methods require natural gas or electrical power. The method advanced by the new device, called direct solar ... […]
Harvesting clean hydrogen fuel through artificial photosynthesis
on May 3, 2018 at 9:35 am
The colorized electron microscope image shows the gallium nitride towers of the artificial photosynthesis device at 52.5k magnification. These nanostructures rip water molecules apart into hydrogen and oxygen to produce clean hydrogen fuel. Credit: Faqrul A. […]
“Killer” Bacteria To The Rescue! Scientists Enlist E.Coli To Make Planet-Saving Plastic Out Of Practically Nothing
on May 3, 2018 at 5:00 am
The Intertubes have buzzing with news of a new way to make plastic without using petroleum or petrochemicals. Based on artificial photosynthesis, the process uses sunlight and carbon dioxide to make the building blocks for renewable plastics as well as ... […]
via Bing News