Precious metals are the standard catalyst material used for extracting hydrogen from water. The problem is these materials- such as platinum, ruthenium and iridium - are too costly. A team from KTH Royal Institute of Technology recently announced a breakthrough that could change the economics of a hydrogen economy.

　　Led by Licheng Sun, professor of molecular electronics at KTH, the researchers concluded that precious metals can be replaced by a much cheaper combination of nickel, iron and copper (NiFeCu).

　　"The new alloy can be used to split water into hydrogen," says researcher Peili Zhang. "This catalyst becomes more efficient than the technologies available today, and significantly cheaper.

　　"This technology could enable a large-scale hydrogen production economy," he says. Hydrogen can be used for example to reduce carbon dioxide from steel production or to produce diesel and aircraft fuel.

　　It's not the first time a cheaper material has been proposed for water splitting, but the researchers argue that their solution is more effective than others. They published their results recently in the scientific journalNature Communications.

　　"The high catalytic performance of core-shell NiFeCu for water oxidation is attributed to the synergistic effect of Ni, Fe and Cu," Zhang says.

　　Zhang says that copper plays an interesting role in the preparation of the electrode. In an aqueous solution, surface copper dissolves and leave a very porous structure to enhance the electrochemically active surface area. "The porous oxide shell with its high electrochemically active surface area is responsible for the catalytic activity, while the metallic cores work as facile electron transport highways," Zhang says.

　　Explore further: Scientists made it cheaper to produce hydrogen from water 

　　More information: Peili Zhang et al. Dendritic core-shell nickel-iron-copper metal/metal oxide electrode for efficient electrocatalytic water oxidation, Nature Communications (2018). DOI: 10.1038/s41467-017-02429-9