Surface Enrichment in Gallium‐Indium Liquid Alloys: Applied to CO2 Conversion

Author:

Gholampoursaadi Fahimeh1ORCID,Zhi Xing2,Nour Shirin3,Liu Jefferson Zhe2,Li Gang Kevin1,Mayyas Mohannad1ORCID

Affiliation:

1. Clean Energy Group Department of Chemical Engineering The University of Melbourne Melbourne VIC 3010 Australia

2. Department of Mechanical Engineering The University of Melbourne Melbourne VIC 3010 Australia

3. Department of Biomedical Engineering Graeme Clark Institute The University of Melbourne Melbourne VIC 3010 Australia

Abstract

AbstractLiquid metal alloys can accumulate specific solute metal atoms on their surface, creating distinct quasi‐ordered atomic layers. Such atomic layers can be tuned by varying the alloy composition to form catalytic interfaces suited for multi‐step reactions. Here, the surface enrichment in gallium‐indium alloys is studied and utilized for carbon dioxide (CO2) electrochemical reduction. The results show that adding a small amount of indium (16.8 at%) to gallium leads to a significant indium enrichment of >83 at% on the topmost layer of the alloy. This enrichment dictates the CO2 conversion pathway, leading to 98% faradaic efficiency toward formate at −1.90 V vs reversible hydrogen electrode (RHE). This study produces unprecedented insights into key interfacial processes and lays the foundation for significant further work within the areas of catalysis and liquid metals.

Funder

Australian Research Council

Publisher

Wiley

Subject

Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials

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