수전해 산소발생반응을 위한 전기촉매로서 Ir/Au 나노클러스터의 최적화
Optimization of Ir/Au Nanoclusters as Electrocatalyst for Oxygen Evolution Reaction in Water Electrolysis
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초록
Efficient and durable electrocatalysts for the oxygen evolution reaction (OER) are essential for advancing green hydrogen production via water electrolysis. Iridium is favored for its high catalytic activity and stability in acidic environments, particularly in proton exchange membrane (PEM) electrolyzers, but its high cost and scarcity limit large-scale application. This study explores the use of gold nanoparticle supports to enhance the utilization of Ir, aiming to reduce Ir loading while maintaining catalytic performance. Ir/Au nanocluster (Ir/Au-NC) was synthesized with varying Ir loadings, and their structural, electrochemical, and catalytic properties were evaluated. An optimal Ir loading of 0.6 wt% was identified, achieving a balance between high mass activity and low overpotential. The Ir/Au-NC catalyst exhibited a significantly larger electrochemically active surface area (ECSA) of 116m2 g−1 than commercial Ir Black (23m2 g−1), resulting in a lower overpotential of 347 mV compared to 395 mV for Ir Black. Furthermore, the optimized catalyst maintained 85% of its initial activity after 100 cycles, demonstrating excellent stability.
Abstract
Efficient and durable electrocatalysts for the oxygen evolution reaction (OER) are essential for advancing green hydrogen production via water electrolysis. Iridium is favored for its high catalytic activity and stability in acidic environments, particularly in proton exchange membrane (PEM) electrolyzers, but its high cost and scarcity limit large-scale application. This study explores the use of gold nanoparticle supports to enhance the utilization of Ir, aiming to reduce Ir loading while maintaining catalytic performance. Ir/Au nanocluster (Ir/Au-NC) was synthesized with varying Ir loadings, and their structural, electrochemical, and catalytic properties were evaluated. An optimal Ir loading of 0.6 wt% was identified, achieving a balance between high mass activity and low overpotential. The Ir/Au-NC catalyst exhibited a significantly larger electrochemically active surface area (ECSA) of 116m2 g−1 than commercial Ir Black (23m2 g−1), resulting in a lower overpotential of 347 mV compared to 395 mV for Ir Black. Furthermore, the optimized catalyst maintained 85% of its initial activity after 100 cycles, demonstrating excellent stability.
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