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Iridium-Based Cubic Nanocages with 1.1-nm-Thick-Walls: A Highly Efficient and Durable Electrocatalyst for Water Oxidation in an Acidic Medium.
Angewandte Chemie 2019 March 9
We report a highly active and durable water oxidation electrocatalyst based on cubic nanocages with a composition of Ir44Pd10, together with well-defined {100} facets and porous walls of roughly 1.1 nm in thickness. Such nanocages substantially outperform all the water oxidation electrocatalysts reported in literature, with an overpotential of only 226 mV for reaching 10 mA•cm-2geo at a loading of Ir as low as 12.5 μgIr•cm-2 on the electrode in acidic media. When benchmarked against a commercial Ir/C electrocatalyst at 250 mV of overpotential, such a nanocage-based catalyst not only shows enhancements (18.1- and 26.2-fold, respectively) in terms of mass (1.99 A•mg-1Ir) and specific (3.93 mA•cm-2Ir) activities, but also greatly enhanced durability. The enhancements can be attributed to a combination of multiple merits, including a high utilization efficiency of Ir atoms and an open structure beneficial to the electrochemical oxidation of Ir to the active form of IrOx.
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