Oxide-Supported IrNiOx Core-Shell Particles as Efficient, Cost-Effective, and Stable Catalysts for Electrochemical Water Splitting
Oxide-Supported IrNiOx Core-Shell Particles as Efficient, Cost-Effective, and Stable Catalysts for Electrochemical Water Splitting
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DOI：
10.1002/anie.201411072
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发表时间：
2015-03-02
影响因子：
16.6
通讯作者：
Strasser, Peter
中科院分区：
文献类型：
--
作者：
Hong Nhan Nong;Oh, Hyung-Suk;Strasser, Peter
提出了用于电化学水分解的活性且高度稳定的氧化物负载 IrNiOx 核壳催化剂。采用电化学 Ni 浸出和伴随的 Ir 氧化，由双金属 IrNix 前体合金 (PA-IrNix/Meso-ATO) 合成了负载在高表面积介孔锑掺杂氧化锡 (IrNiOx/Meso-ATO) 上的 IrNix@IrOx 纳米颗粒。特别强调 PA-IrNix/Meso-ATO 热处理下 Ni/NiO 表面偏析以及颗粒/氧化物载体界面的表面化学状态。结合多种表征方法，我们发现了偏析的 NiO 相对核壳颗粒的水分解活性的不利影响。核壳 IrNiOx/Meso-ATO 催化剂在酸性电解质中表现出高水分解活性和前所未有的稳定性，为 PEM 电解槽阳极催化剂的开发提供了实质性进展，大大减少了 Ir 负载并显着提高了耐用性。
Active and highly stable oxide-supported IrNiOx core-shell catalysts for electrochemical water splitting are presented. IrNix@IrOx nanoparticles supported on high-surface-area mesoporous antimony-doped tin oxide (IrNiOx/Meso-ATO) were synthesized from bimetallic IrNix precursor alloys (PA-IrNix/Meso-ATO) using electrochemical Ni leaching and concomitant Ir oxidation. Special emphasis was placed on Ni/NiO surface segregation under thermal treatment of the PA-IrNix/Meso-ATO as well as on the surface chemical state of the particle/oxide support interface. Combining a wide array of characterization methods, we uncovered the detrimental effect of segregated NiO phases on the water splitting activity of core-shell particles. The core-shell IrNiOx/Meso-ATO catalyst displayed high water-splitting activity and unprecedented stability in acidic electrolyte providing substantial progress in the development of PEM electrolyzer anode catalysts with drastically reduced Ir loading and significantly enhanced durability.