The lack of low-cost and efficient oxygen evolution reaction(OER)catalysts in acid media has significantly limited the development of proton exchange membrane water electrolysis,which can perfectly integrate with inte...The lack of low-cost and efficient oxygen evolution reaction(OER)catalysts in acid media has significantly limited the development of proton exchange membrane water electrolysis,which can perfectly integrate with intermittent renewable energy.Recently,iridium and non-noble metal mixed oxides have been identified as promising candidates for the OER in acid media.Herein,we report a novel double mixed metal oxide BaIrO_(2.937)/La_(3)IrO_(7) with a surface of IrOx formed by Ba and La leaching as an efficient electrocatalyst for boosting the sluggish OER.In 0.1 M HClO4,a low overpotential of 290 mV is required for BaIrO_(2.937)/La_(3)IrO_(7) to achieve the benchmark of 10 mA cm^(-2),comparable to commercial IrO_(2) and most reported acidic OER electrocatalysts.Moreover,a smaller Tafel slope of BaIrO_(2.937)/La_(3)IrO_(7) signifies fast reaction kinetics.Significantly important is that the iridium based mass activity was 561.6 A g_(Ir)^(-1) at 1.63 V vs.a reversible hydrogen electrode,which is 3.9 times as high as that of commercial IrO_(2).This work highlights the smart design of double mixed metal oxides with surface reconstruction as highly active and low cost electrocatalysts for the OER in acidic media.展开更多
基金supported by the Taishan Scholar Program of Shandong Province from the Department of Education of Shandong Province,China(ts201712045)National Natural Science Foundation of China(22102079)+1 种基金Natural Science Foundation of Shandong Province,China(ZR2021YQ10)Doctoral Found of QUST(0100229001,010029081).
文摘The lack of low-cost and efficient oxygen evolution reaction(OER)catalysts in acid media has significantly limited the development of proton exchange membrane water electrolysis,which can perfectly integrate with intermittent renewable energy.Recently,iridium and non-noble metal mixed oxides have been identified as promising candidates for the OER in acid media.Herein,we report a novel double mixed metal oxide BaIrO_(2.937)/La_(3)IrO_(7) with a surface of IrOx formed by Ba and La leaching as an efficient electrocatalyst for boosting the sluggish OER.In 0.1 M HClO4,a low overpotential of 290 mV is required for BaIrO_(2.937)/La_(3)IrO_(7) to achieve the benchmark of 10 mA cm^(-2),comparable to commercial IrO_(2) and most reported acidic OER electrocatalysts.Moreover,a smaller Tafel slope of BaIrO_(2.937)/La_(3)IrO_(7) signifies fast reaction kinetics.Significantly important is that the iridium based mass activity was 561.6 A g_(Ir)^(-1) at 1.63 V vs.a reversible hydrogen electrode,which is 3.9 times as high as that of commercial IrO_(2).This work highlights the smart design of double mixed metal oxides with surface reconstruction as highly active and low cost electrocatalysts for the OER in acidic media.
