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首页> 外文期刊>Advanced energy materials >Hierarchically Structured Ultraporous Iridium-Based Materials: A Novel Catalyst Architecture for Proton Exchange Membrane Water Electrolyzers
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Hierarchically Structured Ultraporous Iridium-Based Materials: A Novel Catalyst Architecture for Proton Exchange Membrane Water Electrolyzers

机译：基于分层结构的超微铱材料：用于质子交换膜水电解槽的新型催化剂架构

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摘要

Iridium oxide is the gold-standard catalyst for the oxygen evolution reaction (OER) in acidic media due to its unmatched activity and stability. Here, a new catalyst architecture comprising a nanoneedle network of iridium-containing oxides assembled into macroporous micrometric particles with approximate to 75% of porosity is reported. The rationally designed porous hierarchical structure optimizes the accessibility of reactants and products to the surface of the nanoparticles and maximizes catalyst activity. The materials are easily prepared from aqueous solutions by an industrially viable spray-drying route through an evaporation self-assembly mechanism. The versatility of the process enables the preparation of mixed oxides with low iridium content, particles with tunable crystallinity, and various iridium surface species with high electrochemical activity. Highly porous Ir0.7Ru0.3O2 outperforms commercial iridium oxide. These materials also represent an ideal platform to assess the reactivity of the iridium and oxygen species involved in the oxygen evolution reaction. Furthermore, it is demonstrated that these highly porous particles are optimal building blocks to be integrated into catalyst layers, without the drawbacks associated with the use of discrete nanoparticles. Fresh- and end-of-test membrane-electrode assemblies' characterization shows that their particular architecture is preserved upon catalyst layer preparation and after operation in a proton-exchange membrane electrolysis cell.
机译：由于其无与伦比的活性和稳定性，氧化铱是酸性介质中的氧气进化反应（Oer）的金标准催化剂。这里，据报道，在此，包括纳米氧化铱氧化物的纳米型氧化物纳米型氧化物的纳米型载体架构，其报告了大致达到75％的孔隙率的大孔微米粒子。理性设计的多孔层状结构优化反应物和产物的可达性在纳米颗粒的表面上并最大化催化剂活性。通过蒸发自组装机理，通过工业上可行的喷雾干燥途径容易地由水溶液中易于制备材料。该方法的多功能性使得能够制备具有低铱含量的混合氧化物，具有可调谐结晶度的颗粒，以及具有高电化学活性的各种铱表面物质。高度多孔IR0.7RU0.3O2优于商业铱氧化物。这些材料还代表了评估铱和氧气种类的反应性的理想平台。此外，证明这些高度多孔颗粒是将最佳的结构块集成到催化剂层中，而不与使用离散纳米颗粒相关的缺点。新鲜和测试结束膜 - 电极组件的表征表明它们的特定架构在催化剂层制备上保存并在质子交换膜电解细胞中的操作之后。

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  • 来源
    《Advanced energy materials》 |2019年第4期|1802136.1-1802136.11|共11页
  • 作者

    Faustini Marco; Giraud Marion; Jones Deborah; Roziere Jacques; Dupont Marc; Porter Thomas R.; Nowak Sophie; Bahri Mounib; Ersen Ovidiu; Sanchez Clement; Boissiere Cedric; Tard Cedric; Peron Jennifer;

  • 作者单位

    Sorbonne Univ Coll France CNRS UMR 7574 Chim Matiere Condensee Paris F-75005 Paris France;

    Univ Paris Diderot Sorbonne Paris Cite UMR CNRS 7086 ITODYS 15 Rue Jean Antoine de Baif F-75205 Paris 13 France;

    Univ Montpellier UMR 5253 Interfaces & Mat Energy ICGM Aggregates F-34095 Montpellier France;

    Univ Montpellier UMR 5253 Interfaces & Mat Energy ICGM Aggregates F-34095 Montpellier France;

    Univ Montpellier UMR 5253 Interfaces & Mat Energy ICGM Aggregates F-34095 Montpellier France;

    Univ Paris Diderot Sorbonne Paris Cite Lab Electrochim Mol Unite Mixte Rech Univ CNRS 7591 Batiment Lavoisier 15 Rue Jean de Baif F-75205 Paris 13 France;

    Univ Paris Diderot Sorbonne Paris Cite UMR CNRS 7086 ITODYS 15 Rue Jean Antoine de Baif F-75205 Paris 13 France;

    Univ Strasbourg IPCMS UMR 7504 CNRS 23 Rue Loess BP 43 F-67034 Strasbourg 2 France;

    Univ Strasbourg IPCMS UMR 7504 CNRS 23 Rue Loess BP 43 F-67034 Strasbourg 2 France;

    Sorbonne Univ Coll France CNRS UMR 7574 Chim Matiere Condensee Paris F-75005 Paris France;

    Sorbonne Univ Coll France CNRS UMR 7574 Chim Matiere Condensee Paris F-75005 Paris France;

    Univ Paris Saclay Ecole Polytech CNRS LCM F-91128 Palaiseau France;

    Univ Paris Diderot Sorbonne Paris Cite UMR CNRS 7086 ITODYS 15 Rue Jean Antoine de Baif F-75205 Paris 13 France;

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  • 正文语种 eng
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  • 关键词

    anodes; electrolysis; hydrogen; nanoneedles; porous catalysts;

    机译：阳极;电解;氢;纳金属;多孔催化剂;

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