The dearth of appropriate electrocatalysts for stable anodic water splitting, oxygen evolution reaction (OER), in acid has given rise to concerted efforts toward making iridium-based high aspect ratio nanomaterials, as iridium and its higher valent oxides have been shown time and again to exhibit the most optimal balance between activity and durability. Here, we show a dealloying strategy to synthesize free-standing 3D, oxide skinned nanoporous Ir electrocatalysts (np-Ir) with demonstrated enhanced activity and durability in comparison to more traditional IrO_x nanoparticulate catalysts. The metallic core and absence of any binder/support result in low electrode and charge transfer resistance, ultimately giving rise to lower OER overpotentials and improved activity.

在酸中缺乏用于稳定阳极水分解的合适电催化剂，氧气析出反应（OER）引起了人们对制造铱基高长径比纳米材料的一致努力，因为铱及其高价氧化物一次又一次地显示出在活性和耐久性之间表现出最佳平衡。在这里，我们展示了一种脱钩策略，用于合成独立的3D氧化物蒙皮纳米多孔Ir电催化剂（np-Ir），与更传统的IrO _x纳米颗粒催化剂相比，具有增强的活性和耐久性。金属芯和不存在任何粘合剂/载体导致电极和电荷转移电阻低，最终导致较低的OER过电势和改善的活性。