首页|Lotus root-like RuIr alloys with close-packed(0001)branches:Strain-driven performance for acidic water oxidation
Lotus root-like RuIr alloys with close-packed(0001)branches:Strain-driven performance for acidic water oxidation
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Achieving composition tunability and structure editability of nanoalloys with high level strain may be an efficient strategy to remarkably boost catalytic performance toward oxygen evolution reaction(OER)in acidic water oxidation.Herein,lotus root-like Rulr alloys with native micro-strain were constructed by an epitaxial growth of Ru-richened hcp-(0001)branches on Ir-richened fcc-(1 11)seeds using a polyol ther-mal synthesis strategy.The resultant Ru60Ir40 alloy shows an OER overpotential of 197 mV at 10 mA cm-2 and a Tafel slope of 46.59 mV dec-1,showing no obvious activity decay for 80 h continuous chronopoten-tiometry test in 0.5 M H2SO4.The related characterizations including X-ray absorption fine structure(XAFS)spectroscopy and density functional theory(DFT)calculations show that that the remarkably improved activity of the lotus root-like alloy can be attributed to the(0001)facet-triggered strain,which can efficiently optimize the electronic band structure of the active metal and the weakening of the chemisorption of oxygen-containing substances to boost OER electrocatalysis.Therefore,this work pro-vides a new strategy to designing a class of advanced electrocatalysts with high strain using diverse nanostructures as building materials for carbon-free clean energy conversion systems.
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