Colloidal Synthesis Enables Indium Solubility Modulation in Liquid Gallium Nanoparticles for Temperature-Dependent
Coline Boulanger1, Pau Torruella2, Krishna Kumar1
1Laboratory of Nanochemistry for Energy (LNCE), Institute of Chemical Sciences and Engineering (ISIC), École Polytechnique Fédérale de Lausanne, SionCH-1950, Switzerland.
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Bulk liquid metals (LMs) are unique stimulus-responsive dynamic materials that are appealing across different fields of science and technology, including catalysis. However, the low surface-to-volume ratio, limited atomic-scale design, and required ad-hoc reactor engineering of bulk LM limit their exploitation. Colloidal LM nanoparticles (NPs) can address all of these shortcomings; however, their synthetic chemistry is challenging and less advanced compared to other materials. Here, we advance the synthetic knowledge on LM NPs and propose a colloidal approach for the synthesis of monodispersed In-Ga NPs with tunable indium content via a balanced precursor reactivity strategy. The synthesis generates temperature- and voltage-responsive supercooled metastable NPs, which we leverage for CO2 electroreduction. The metastable NPs show a unique temperature-dependent modulation of active sites, which results in increasing formate production with temperature. This behavior opposes the temperature deactivation reported so far for solid CO2RR catalysts toward the same product.
