Journal
CHEMICAL ENGINEERING JOURNAL
Volume 475, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2023.146456
Keywords
CO2 reduction; Ethanol; Grain boundary; Sulfur
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Electrochemical CO2 reduction powered by renewable electricities is a promising solution to achieve carbon neutrality. In this study, In2S3 nanocrystals with abundant grain boundaries showed a high ethanol production efficiency due to the enrichment of *CO intermediates, promoting the coupling of CO molecules and facilitating ethanol production.
Electrochemical CO2 reduction powered by renewable electricities is a promising solution to the target of Carbon Neutrality. In-based catalysts are often used to convert CO2 to formate. Herein, In2S3 nanocrystals were synthesized through varying hydrothermal reaction time and unexpectedly exhibited a high ethanol faradaic efficiency (FE) of 44% at a low overpotential of just 200 mV, which was attributed to abundant grain boundaries of In2S3 with nanoparticle-nanosheet hybrid structures. Furthermore, in-situ FTIR spectra and DFT calculations indicated that the sulfur in these grain boundaries enriched *CO intermediates on the catalyst surface, thereby promoting the CO-CO coupling step and ultimately facilitating ethanol production.
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