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Posted: Mar 11, 2013

Researchers find a novel way to split water molecules into hydrogen and oxygen (w/video)

(Nanowerk News) Using the power of the sun and ultrathin films of iron oxide (commonly known as rust), the researchers have found a novel way to split water molecules into hydrogen and oxygen. The breakthrough, published online in Nature Materials ("Resonant light trapping in ultrathin films for water splitting") could lead to less expensive, more efficient ways to store solar energy in the form of hydrogen-based fuels.
This could be a major step forward in the development of viable replacements for fossil fuels. “At the end of the day, we would like to substitute solar energy for oil,” lead researcher Rothschild says. “Our approach is the first of its kind. We have found a way to trap light in ultrathin films of iron oxide that are 5,000 times thinner than typical office paper. This is the enabling key to achieving high efficiency and low cost.”
Iron oxide is a common semiconductor material, inexpensive to produce, stable in water, and - unlike other semiconductors such as silicon - can oxidize water without itself being oxidized, corroded, or decomposed.
But it also presents challenges, the greatest of which is finding a way to overcome its poor electrical transport properties. Researchers have struggled for years with the tradeoff between light absorption and the separation and collection of photogenerated charge carriers before they die out by recombination.
“Our light-trapping scheme overcomes this tradeoff, enabling efficient absorption in ultrathin films wherein the photogenerated charge carriers are collected efficiently,” says Rothschild. “The light is trapped in quarter-wave or even deeper sub-wavelength films on mirror-like back reflector substrates. Interference between forward- and backward-propagating waves enhances the light absorption close to the surface, and the photogenerated charge carriers are collected before they die off.“
The breakthrough could make possible the design of inexpensive solar cells that combine ultrathin iron oxide photoelectrodes with conventional photovoltaic cells based on silicon or other materials to produce electricity and hydrogen. According to Rothschild, these cells could store solar energy for on-demand use, 24 hours per day. This is in strong contrast to conventional photovoltaic cells, which provide power only when the sun is shining (and not at night or when it is cloudy).
The findings could also be used to reduce the amount of extremely rare elements that the solar panel industry uses to create the semiconductor material in their second-generation photovoltaic cells. The Technion team’s light-trapping method could save 90 percent or more of elements like Tellurium and Indium, with no compromise in performance.
Rothschild says that he is very proud that his students - notably PhD candidate Hen Dotan - conceived of the idea and developed it and that, “We achieved results that are better than ever reported before for this kind of device and this kind of material.”
The research was carried out in the Electroceramic Materials & Devices Laboratory and some measurements were performed at the Photovoltaics Laboratory; both labs are supported by the Russell Berrie Nanotechnology Institute (RBNI) and by the Grand Technion Energy Program (GTEP).
Source: Israel Institite of Technology
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