Today, the journal Science published the latest development in Michael Grätzel’s laboratory at EPFL: producing hydrogen fuel from sunlight and water.
By combining a pair of solar cells made with a mineral called perovskite and low cost electrodes, scientists have obtained a 12.3 percent conversion efficiency from solar energy to hydrogen, a record using earth-abundant materials as opposed to rare metals.
The race is on to optimize solar energy’s performance. More efficient silicon photovoltaic panels, dye-sensitized solar cells, concentrated cells and thermodynamic solar plants all pursue the same goal: to produce a maximum amount of electrons from sunlight. Those electrons can then be converted into electricity to turn on lights and power your refrigerator.
At the Laboratory of Photonics and Interfaces at EPFL, led by Michael Grätzel, where scientists invented dye solar cells that mimic photosynthesis in plants, they have also developed methods for generating fuels such as hydrogen through solar water splitting. To do this, they either use photoelectrochemical cells that directly split water into hydrogen and oxygen when exposed to sunlight, or they combine electricity-generating cells with an electrolyzer that separates the water molecules.
By using the latter technique, Grätzel’s post-doctoral student Jingshan Luo and his colleagues were able to obtain a performance so spectacular that their achievement is being published today in the journal Science. Their device converts into hydrogen 12.3 percent of the energy diffused by the sun on perovskite absorbers – a compound that can be obtained in the laboratory from common materials, such as those used in conventional car batteries, eliminating the need for rare-earth metals in the production of usable hydrogen fuel.[MW1]
Bottled sun
This high efficiency provides stiff competition for other techniques used to convert solar energy. But this method has several advantages over others:
The Latest on: Hydrogen fuel
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The Latest on: Hydrogen fuel
- California’s Dream of a Green Hydrogen Future Could Backfireon May 9, 2024 at 2:30 am
Backers argue that California must move quickly to reap the benefits of federal incentives. Guidelines for the hydrogen hub money require states to build up their supply and delivery of clean hydrogen by 2030. California’s hub plan only makes financial sense if it can take advantage of those tax credits, supporters said.
- Hydrogen is fuel of the future, vehicles will run on green fuels in coming years says Nitin Gadkarion May 8, 2024 at 9:39 pm
Addressing an election rally in support of BJP leader and Union minister Giriraj Singh in Begusarai, Gadkari said, "India imports fossil fuel every year... soon, our farmers will produce green fuels."
- Why Attending the 2024 Hydrogen Technology Expo is Essentialon May 8, 2024 at 9:43 am
Houston, Texas, is poised to become the focal point of the hydrogen and clean energy industry as it prepares to host the Hydrogen Technology Expo North America
- The Hydrogen Stream: U.S. government targets $2/kg by 2026, $1/kg by 2031on May 8, 2024 at 7:50 am
The US Department of Energy says it is aiming for “clean” hydrogen production costs of $2/kg by 2026 and $1/kg by 2031.
- Australian Startup Mimics Trees to Make Cheaper Green Hydrogenon May 8, 2024 at 6:58 am
Hysata raised $111 million from investors including BP to scale its technology, which could help lower the cost of the clean-burning fuel.
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