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 fuel.
“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…”
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,” says Zetian Mi, a professor of electrical and computer engineering at the University of Michigan who led the research while at McGill University.
Faqrul Alam Chowdhury, a doctoral student in electrical and computer engineering at McGill, says 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 says.
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 says. “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 says.
The researchers describe the device in Nature Communications.
Additional coauthors are from the Center of Excellence in Transportation Electrification and Energy Storage, Hydro-Québec, and McGill University. The Fuel Cell Technologies Office of the US Department of Energy and Emissions Reduction Alberta supported the work.
Source: University of Michigan