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New Perovskite Catalyst May Split Water
June 26, 2018 | Leave a Comment
University of Oxford researchers have found a new class of materials called halide double perovskites may have just the right properties to split water. In a process called photocatalytic water splitting, sunlight separates water into hydrogen and oxygen. The hydrogen and oxygen can then be recombined in a fuel cell to release energy.
According to the research paper published in Applied Physics Letters, a new class of materials, halide double perovskites, may have just the right properties to split water.
Feliciano Giustino, a co-author on the paper said, “If we can come up with a material that can be useful as a water-splitting photocatalyst, then it would be an enormous breakthrough.”
Novel, lead-free double perovskites as potential photocatalysts for solar water splitting. Image Credit: George Volonakis, Oxford University. Click image for the largest view.
Researchers have experimented with many photocatalytic materials before, such as titanium dioxide (TiO2). While TiO2 can harness sunlight to split water, it’s inefficient because it doesn’t absorb visible light well. So far, no photocatalytic material for general water splitting has become viable as commercially available.
Using supercomputers to calculate the quantum energy states of four halide double perovskites, George Volonakis and Giustino, both of the University of Oxford, found that Cs2BiAgCl6 and Cs2BiAgBr6 are promising photocatalytic materials because they absorb visible light much better than TiO2. They also generate electrons and holes (the positively charges absence of electrons) that have sufficient energy (or nearly ideal energies) to split water into hydrogen and oxygen.
Very few other materials have all these features at once, Giustino said. “We can’t say this will work for sure, but these compounds seem to have all the right properties.”
Giustino and his team originally discovered this type of perovskite while looking for materials to make solar cells. Over the last several years, perovskites have garnered interest as materials to boost the efficiency of silicon-based solar cells through tandem designs that integrate a perovskite cell directly onto a high-efficiency silicon cell, but they contain a small amount of lead. If they were used for energy harvesting in a solar farm, the lead could pose a potential environmental hazard.
In 2016, using computer simulations to identify alternative materials, the researchers found a new type of lead-free perovskite with potential for high-efficiency solar cells. The newest paper shows these new materials may also split water.
Volonakis said, “These new double perovskites are not only promising as a complementary material for tandem solar cells, but they can also be promising in areas like photocatalysis.”
Still, the new analysis is theoretical, assuming the compounds form perfect crystals. The next step, the authors said, is for experimentalists to see if the material works in the real world as well as predicted. In the meantime, the researchers are using their computational techniques to explore whether these double perovskites have properties useful for other applications like light detectors.
Your humble writer suspects the perovskite catalysts will work. Likely in direct proportion to the share of perfect crystals the team can form in a sample. Therein lies the perovskite challenge, building up production in exact form in high quality and quantity. This will come as the demand for mare and better gets into the fields where perovskite is the clear winner of materials. But for now lab research samples are the norm, commercial scaling demand is still a while to wait.
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