The formation of oxygen vacancies and uncoordinated sites at the molecular level may be responsible for the improved performance. The SrFe 0.1Ir 0.9O 3 had the highest activity among the investigated catalysts with the lowest overpotential of 238 mV at 10 mA cm −2 in 0.1 M HClO 4 solution, which could be attributed to the oxygen vacancies induced by the Fe dopant and the IrOx formed upon the dissolution of Sr and Fe. Upon further increases in the Fe/Ir ratio, the structure of SrIrO 3 changed from a 6H to 3C phase. The monoclinic structure of SrIrO 3 was retained when the Fe/Ir ratio was less than 0.1/0.9. This work presents a systematic study of the doping effects of Fe on the OER activity of monoclinic SrIrO 3 to reduce the consumption of Ir. Ir-based perovskite oxides are efficient electrocatalysts for anodic oxygen evolution.
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