Unveiling reductant chemistry in fabricating noble metal aerogels for superior oxygen evolution and ethanol oxidation
Unveiling reductant chemistry in fabricating noble metal aerogels for superior oxygen evolution and ethanol oxidation
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DOI：
10.1038/s41467-020-15391-w
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发表时间：
2020-03-27
影响因子：
16.6
通讯作者：
Eychmueller, Alexander
中科院分区：
文献类型：
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作者：
Du, Ran;Wang, Jinying;Eychmueller, Alexander
在众多多孔材料中，贵金属气凝胶因其具有催化性能和大表面积而受到广泛关注。然而，对制造过程中关键因素（如还原剂和配体）的理解和研究不足，限制了目标设计，阻碍了材料的多样性和可用应用。在此，揭示了还原剂的多重作用，我们开发了一种有效的方法，即过度还原剂导向凝胶策略。它能够整合配体化学，以创造具有创纪录的高比表面积(59.8m（2) g(-1)）的金气凝胶，并将成分扩展到所有常见的贵金属。此外，我们还展示了这些气凝胶在乙醇氧化和析氧反应中的令人印象深刻的电催化性能，并发现了一种非常规的有机配体增强效应。本研究不仅丰富了贵金属气凝胶的组成和结构多样性，而且为设计广泛材料体系的高效电催化剂开辟了新的方向。
Amongst various porous materials, noble metal aerogels attract wide attention due to their concurrently featured catalytic properties and large surface areas. However, insufficient understanding and investigation of key factors (e.g. reductants and ligands) in the fabrication process limits on-target design, impeding material diversity and available applications. Herein, unveiling multiple roles of reductants, we develop an efficient method, i.e. the excessive-reductant-directed gelation strategy. It enables to integrate ligand chemistry for creating gold aerogels with a record-high specific surface area (59.8m(2) g(-1)), and to expand the composition to all common noble metals. Moreover, we demonstrate impressive electrocatalytic performance of these aerogels for the ethanol oxidation and oxygen evolution reaction, and discover an unconventional organic-ligand-enhancing effect. The present work not only enriches the composition and structural diversity of noble metal aerogels, but also opens up new dimensions for devising efficient electrocatalysts for broad material systems.