산소 발생 반응 활성을 향상시키는 새로운 조성 전략 : OER 활성을위한 IrRu 기반 촉매에 대한 Y 첨가 효과

Abstract

The excellent activity and durability of the PEM electrolyzer using a small amount of Ir as oxygen evolution reaction (OER) catalysts are considered an important topic in the industry and academia. In the previous study, IrRu-based OER catalysts by simple impregnation method showed a superior activity towards OER in the acidic condition, which has at least an over-potential of 75 mV lower than the commercial IrO2 at 10mA/cm2. In the present study, to increase the activity and durability of the IrRu based OER catalyst, the ternary alloy catalyst is studied by introduction of Y element to the IrRu composition because there is no report for the IrRuY alloy as OER catalyst in acid media until now. In addition, these nanoparticles were synthesized by Electron Beam method, which is not only eco-friendly but also a mass production capability in a short time. To secure the metallic state of all component, gas reduction at higher temperature is conducted. Through the XPS analysis, all of the elements making up the IrRuY-based catalysts were confirmed as a metallic state. From the half-cell test, heat-treated IrRu4Y3 among the IrRuY-based OER catalysts displayed the best activity at 10mA/cm2, which is an over-potential of 90mV lower than the IrRu4/C that in the previous study was reported.