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[资源] nature materials 最新: TiO2用于光解水制氢

A leading approach for large-scale electrochemical energy production with minimal global-warming gas emission is to use a
renewable source of electricity, such as solar energy, to oxidize water, providing the abundant source of electrons needed in
fuel synthesis.We report corrosion-resistant, nanocomposite anodes for the oxidation of water required to produce renewable
fuels. Silicon, an earth-abundant element and an efficient photovoltaic material, is protected by atomic layer deposition (ALD)
of a highly uniform, 2nm thick layer of titanium dioxide (TiO2) and then coated with an optically transmitting layer of a known
catalyst (3nm iridium). Photoelectrochemical water oxidation was observed to occur below the reversible potential whereas
dark electrochemicalwater oxidationwas found to have low-to-moderate overpotentials at all pH values, resulting in an inferred
photovoltage of550 mV.Water oxidation is sustained at these anodes for many hours in harsh pH and oxidative environments
whereas comparable silicon anodes without the TiO2 coating quickly fail. The desirable electrochemical efficiency and corrosion
resistance of these anodes is made possible by the low electron-tunnelling resistance (<0:006cm2 for pC-Si) and uniform
thickness of atomic-layer deposited TiO2.

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