Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume 2022, Issue 29, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.202200365
Keywords
Carbon; CO2 reduction; Electrochemistry; Particle size; Silver
Categories
Funding
- Dutch Research Council (NWO) [2016.008]
- Shell Global Solutions International B.V.
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This study presents a strategy for synthesizing highly dispersed, ligand-free silver Ag nanoparticles supported on carbon, emphasizing the importance of heat treatment atmosphere and carbon surface chemistry in controlling the Ag particle size. The Ag weight-based activity of the catalysts scales inversely with particle size, while the Ag surface-specific activity is independent of particle size in the 10-30 nm range.
Silver-based catalysts are attractive for electroreduction of CO2 to CO. To understand the electrocatalyst properties, a good control over the nanoparticle size is necessary. Herein, we report a strategy to synthesize highly dispersed, ligand-free silver Ag nanoparticles supported on carbon. We demonstrate that the heat treatment atmosphere and carbon surface chemistry are crucial to control the Ag particle size in the 10-30 nm range. Even at low silver loadings (0.099 m(Ag)(2) m(-2)), Ag nanoparticles outperforms the bulk silver at low overpotentials, leading to a 23.5 % CO Faradaic efficiency at -1.2 V vs RHE. The Ag weight-based activity of the catalysts scales with the inverse particle size, while the Ag surface-specific activity is independent of the particle size in this range. The supported silver nanoparticles can produce a H-2 to CO ratio of 2.9 to 1, interesting for further exploration of this type of catalysts for syngas synthesis.
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