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Synthesis of noble/non-noble metal alloy nanostructures via an active-hydrogen-involved interfacial reduction strategy
Nature Synthesis Pub Date : 2023-01-16 , DOI: 10.1038/s44160-022-00217-y
Zhaojun Liu , Yilan Jiang , Zhixue Zhang , Xiaoxiao Wang , Kai Liu , Zhun Qiao , Moxuan Liu , Shumeng Zhang , Zerui Mu , Qing Zhang , Chuanbo Gao

Traditional solution-phase synthesis of noble/non-noble metal alloy nanocrystals lacks control over metal co-reduction due to the difference in reduction potentials. As a result, these synthetic routes lead to constrained compositional space. To address this problem, we have developed an active-hydrogen (H*)-involved interfacial reduction method for the synthesis of alloy nanostructures. The introduction of HNO2 into the reaction generates H* at the metal seed/solution interface, creating a highly reducing environment. Metal reduction, therefore, migrates from the solution phase to the interface, and H*, as a strong reducing agent, can negate the effect of the reduction potential differences of metal salts, leading to their effective co-reduction. We demonstrate the synthesis of a library of Pt–M alloy nanoshells (M = Fe, Co, Ni, Ga, In, Sn, Pb, Bi) on palladium octahedral cores with precise compositional control, enabling screening of the materials as catalysts for the hydrogen evolution reaction. This strategy paves a way for noble/non-noble metal alloy nanostructures with superior synthetic control for a broad range of applications.



中文翻译:

通过活性氢参与的界面还原策略合成贵金属/非贵金属合金纳米结构

由于还原电位的差异,贵金属/非贵金属合金纳米晶体的传统溶液相合成缺乏对金属共还原的控制。结果,这些合成路线导致受限的组成空间。为了解决这个问题,我们开发了一种用于合成合金纳米结构的活性氢 (H*) 参与界面还原方法。HNO 2的引入进入反应在金属种子/溶液界面产生 H*,创造高度还原的环境。因此,金属还原从溶液相迁移到界面,H*作为强还原剂可以抵消金属盐还原电位差的影响,从而实现有效的共还原。我们展示了在具有精确成分控制的钯八面体核上合成 Pt-M 合金纳米壳(M = Fe、Co、Ni、Ga、In、Sn、Pb、Bi)库,从而能够筛选出作为催化剂的材料析氢反应。该策略为贵金属/非贵金属合金纳米结构铺平了道路,并为广泛的应用提供了卓越的合成控制。

更新日期:2023-01-17
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