Electrocatalytic water splitting is about to get less costly, thanks to research at KTH Royal Institute of Technology. Credit: Image courtesy of KTH The Royal Institute of Technology
A hydrogen-fuel economy could finally become a reality with the recent discovery of a cheap, stable and efficient means of getting hydrogen from water. Scientists at KTH Royal Institute of Technology in Stockholm have unlocked one major barrier to exploiting this renewable energy source. Because the best-performing catalysts for electrochemical oxidation, or “water splitting,” are expensive precious metals, the team led by KTH Professor Licheng Sun is one of many worldwide searching for cheaper alternatives. Sun had earlier developed molecular catalysts for water oxidation (Nature Chem. 2012, 4, 418) with an efficiency approaching that of natural photosynthesis.
His team found a new material composed of common earth-abundant elements could be used as a catalyst for water splitting. It is a monolayered double hydroxide involving nickel and vanadium. The low-cost, highly efficient nickel-vanadium monolayer outperforms other electrocatalysts that are composed of non-precious materials. And it offers a competitive, cheap alternative to catalysts that rely on more expensive, precious materials, such as iridium oxide (IrO2) or ruthenium oxide (RuO2).
“This is the first time that the metal, vanadium, has been used to dope nickel hydroxide to form a water oxidation catalyst, and it works very well – even beyond our expectations,” Fan says. “No doubt this material can greatly expand the scope of non-precious metal elements of electrocatalysts, and it opens new areas for water splitting.”
One possibility the discovery raises is large-scale production of hydrogen fuel using Sun’s catalyst. The material possesses a layered structure with monolayer nickel-vanadium oxygen polyhedron connected together with a thickness <1nm. “This monolayer feature not only increases the active surface area, but also enhances the electron transfer within the material,” Chen says.
Sun expects the research to “open a new area of low-cost water oxidation catalysts, featuring stability and efficiencies that equal or even surpass some of today’s best catalysts including RuO2 and IrO2.” https://www.kth.se/en/aktuellt/nyheter/researchers-find-cheaper-way-to-produce-hydrogen-from-water-1.659713
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