Nanoporous multimetallic Ir alloys as efficient and stable electrocatalysts for acidic oxygen evolution reactions
Nanoporous multimetallic Ir alloys as efficient and stable electrocatalysts for acidic oxygen evolution reactions
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DOI：
10.1016/j.jcat.2020.11.038
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发表时间：
2020-12
影响因子：
7.3
通讯作者：
Swarnendu Chatterjee;Saad Intikhab;Lauren A. Profitt;Yawei Li;Varun Natu;Ramchandra Gawas;J. Snyder
中科院分区：
文献类型：
--
作者：
Swarnendu Chatterjee;Saad Intikhab;Lauren A. Profitt;Yawei Li;Varun Natu;Ramchandra Gawas;J. Snyder
由于缺乏合适的电催化剂用于酸中稳定的阳极水分解、析氧反应（OER），已经引起了人们对制造铱基高纵横比纳米材料的共同努力，因为铱及其高价氧化物已经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，我们展示了一种去合金化策略来合成独立的3D氧化物表皮纳米多孔Ir电催化剂（NP-Ir），与更传统的IrOx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/载体导致低的电极和电荷转移电阻，最终导致较低的OER过电位和改善的活性。
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 IrOxnanoparticulate 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.