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Enhanced photocatalytic oxygen evolution activity by formation of Ir@IrO x (OH) y core-shell heterostructure.

Nanotechnology 2018 October 6
Developing efficient catalysts to accelerate the rate of oxygen evolution reaction (OER) is critical for photocatalytic water-splitting. In this work, metallic Ir, IrOx (OH)y , and core-shell Ir@IrOx (OH)y were synthesized and employed as OER catalysts for photocatalytic water oxidation. It was found that the Ir@IrOx (OH)y core-shell heterostructure catalyst showed the best photocatalytic performance among these three catalysts, with the oxygen evolution rate as high as 59.63 mmol g-1 h-1 . Detailed investigations revealed that the excellent photocatalytic activity of Ir@IrOx (OH)y could be attributed to both the outstanding intrinsic activity of IrOx (OH)y shell and the efficient electron transfer between the photosensitizer and catalyst.

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