期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 144, 期 22, 页码 10053-10063出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.2c03698
关键词
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资金
- Swiss National Science Foundation (SNSF) [200021L_191997/1]
- Swiss National Science Foundation (SNF) [200021L_191997] Funding Source: Swiss National Science Foundation (SNF)
Liquid metal nanoparticles (NPs) have emerged as electrocatalysts with unique properties. However, their rapid coalescence has hindered their implementation in electrocatalysis. In this study, liquid gallium NPs were shown to drive the electrochemical CO2 reduction reaction while remaining separated from each other, providing a potential avenue for the development of gallium-based NPs as a new class of electrocatalysts.
Liquid metals (LMs) have been used in electrochemistry since the 19th century, but it is only recently that they have emerged as electrocatalysts with unique properties, such as inherent resistance to coke poisoning, which derives from the dynamic nature of their surface. The use of LM nanoparticles (NPs) as electrocatalysts is highly desirable to enhance any surface-related phenomena. However, LM NPs are expected to rapidly coalesce, similarly to liquid drops, which makes their implementation in electrocatalysis hard to envision. Herein, we demonstrate that liquid Ga NPs (18 nm, 26 nm, 39 nm) drive the electrochemical CO2 reduction reaction (CO2RR) while remaining well-separated from each other. CO is generated with a maximum faradaic efficiency of around 30% at -0.7 VRHE, which is similar to that of bulk Ga. The combination of electrochemical, microscopic, and spectroscopic techniques, including operando X-ray absorption, indicates that the native oxide skin of the Ga NPs is still present during CO2RR and provides a barrier to coalescence during operation. This discovery provides an avenue for future development of Ga-based LM NPs as a new class of electrocatalysts.
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