Freeze-Thaw-Promoted Fabrication of Clean and Hierarchically Structured Noble-Metal Aerogels for Electrocatalysis and Photoelectrocatalysis.,Angewandte Chemie International Edition

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Freeze-Thaw-Promoted Fabrication of Clean and Hierarchically Structured Noble-Metal Aerogels for Electrocatalysis and Photoelectrocatalysis.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-03-18 , DOI: 10.1002/anie.201916484
Ran Du ₁ , Jan-Ole Joswig ₂ , René Hübner ₃ , Lin Zhou ₄ , Wei Wei ₁ , Yue Hu ₄ , Alexander Eychmüller ₁

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Noble‐metal aerogels (NMAs) have drawn increasing attention because of their self‐supported conductive networks, high surface areas, and numerous optically/catalytically active sites, enabling their impressive performance in diverse fields. However, the fabrication methods suffer from tedious procedures, long preparation times, unavoidable impurities, and uncontrolled multiscale structures, discouraging their developments. By utilizing the self‐healing properties of noble‐metal aggregates, the freezing‐promoted salting‐out behavior, and the ice‐templating effect, a freeze–thaw method is crafted that is capable of preparing various hierarchically structured noble‐metal gels within one day without extra additives. In light of their cleanliness, the multi‐scale structures, and combined catalytic/optical properties, the electrocatalytic and photoelectrocatalytic performance of NMAs are demonstrated, which surpasses that of commercial noble‐metal catalysts.

中文翻译：

冷冻融化促进的清洁和分层结构的贵金属气凝胶的制备，用于电催化和光电催化。

贵金属气凝胶（NMA）由于其自支撑的导电网络，高表面积和众多的光学/催化活性位点而受到越来越多的关注，从而使其在不同领域中均具有令人印象深刻的性能。然而，制造方法的过程繁琐，准备时间长，不可避免的杂质以及不受控制的多尺度结构，这阻碍了它们的发展。通过利用贵金属聚集体的自我修复特性，冷冻促进的盐析行为和冰模板效应，精心设计了一种冻融方法，能够在一个内制备各种层次结构的贵金属凝胶没有额外添加剂的一天。鉴于其清洁度，多尺度结构以及催化/光学特性的综合，

更新日期：2020-03-18

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