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]
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
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Honda announced a new hydrogen fuel cell-powered vehicle for the US market in a sign that the automaker has not given up on the most abundant element in the universe for its vehicle lineup. The 2025 ...
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While automakers like BMW and Hyundai have been continually committed to hydrogen fuel-cell vehicles for the future, it’s been a few years since Honda’s fuel-cell Clarity went out of production. But ...
- Some Hydrogen Car Owners Are Still Waiting for the Future to Arriveon February 24, 2024 at 11:00 pm
The Snells, who are retired, care about the environment. When they bought the hydrogen fuel-cell car, “we felt like it was a really pioneering thing to do,” she says. “We still do.” ...
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