催化作用
铱
膜电极组件
电解质
溶解
化学工程
材料科学
耐久性
质子交换膜燃料电池
电解
化学
电极
复合材料
有机化学
工程类
物理化学
作者
Jeong In,Chaekyung Baik,Seung Woo Lee,Chanho Pak
标识
DOI:10.1016/j.cattod.2022.01.015
摘要
Recently, since the continuous rise in cost and scarcity of iridium, it is necessary to minimize the iridium-loading in the membrane electrode assembly (MEA) for large-scale green hydrogen production systems. In this study, IrOx/Ti4O7 catalysts were prepared to increase the utilization of IrOx in the MEA by evenly dispersing the structurally layered IrOx on Ti4O7 support via a modified simple solution-reduction method. Among the catalysts with various iridium/support ratios, the IrOx/Ti4O7(7:3) catalyst demonstrated the optimal balance of catalytic activity, catalytic stability, and corrosion resistance. IrOx/Ti4O7(7:3) catalyst demonstrated a higher mass activity of 372 mA mg-1 at 1.55 V, stable durability period of > 12 h under accelerated stability test (AST), and a low iridium dissolution rate of 0.078 ppbIr h-1. A single-cell test was further conducted using the IrOx/Ti4O7(7:3) catalyst to reveal its catalytic activity in the MEA. Consequently, the mass activity of the IrOx/Ti4O7(7:3) catalyst was found to increase by 139% in comparison to a black IrOx/None catalyst. Additionally, in the single-cell durability test (applied 1 A cm-2 for 50 h), the IrOx/Ti4O7(7:3) catalyst demonstrated a degradation rate of only 0.6 mV h-1 at 1000 A g-1 which can be estimated to have reasonable stability. Therefore, it is anticipated that the IrOx/Ti4O7(7:3) catalyst will reduce the amount of high-cost iridium in the MEA and will result in a low-cost and efficient polymer electrolyte membrane water electrolyzer system for large-scale hydrogen production.
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