期刊
ADVANCED FUNCTIONAL MATERIALS
卷 29, 期 36, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201901649
关键词
2D; galvanic replacement; liquid metals; low melting point; MnO2
类别
资金
- Australian Research Council (ARC) [FL180100053]
- ARC Center of Excellence FLEET [CE170100039]
- Australian Research Council [FL180100053] Funding Source: Australian Research Council
Liquid metals offer unprecedented chemistry. Here it is shown that they can facilitate self-limiting oxidation processes on their surfaces, which enables the growth of metal oxides that are atomically thin. This claim is exemplified by creating atomically thin hydrated MnO2 using a Galvanic replacement reaction between permanganate ions and a liquid gallium-indium alloy (EGaIn). The liquid solution-liquid metal process leads to the reduction of the permanganate ions, resulting in the formation of the oxide monolayer at the interface. It is presented that under mechanical agitation liquid metal droplets are established, and simultaneously, hydrated gallium oxides and manganese oxide sheets delaminate themselves from the interfacial boundaries. The produced nanosheets encapsulate a metallic core, which is found to consist of solid indium only, with the full migration of gallium out of the droplets. This process produces core/shell structures, where the shells are made of stacked atomically thin nanosheets. The obtained core/shell structures are found to be an efficient photocatalyst for the degradation of an organic dye under simulated solar irradiation. This study presents a new research direction toward the modification and functionalization of liquid metals through spontaneous interfacial redox reactions, which has implications for many applications beyond photocatalysis.
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