Metal-organic framework-derived silver/copper-oxide catalyst for boosting the productivity of carbon dioxide electrocatalysis to ethylene.

J Colloid Interface Sci

Collaborative Innovation Center of Nonferrous Metals, School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China. Electronic address:

Published: February 2025

AI Article Synopsis

  • The study discusses the electrochemical reduction of carbon monoxide (CO) into valuable multi-carbon chemicals, focusing on challenges in achieving high selectivity with current catalysts.
  • Researchers developed a new catalyst called CuO/Ag@C, which is derived from metal-organic frameworks and shows a Faradaic efficiency of 48.6% for converting CO to methane (CH) while maintaining stability.
  • The catalyst's effectiveness is attributed to the unique combination of silver (Ag) and copper (Cu) that enhances CO production and optimizes electronic interactions, improving the overall reaction process for CH production.

Article Abstract

Electrochemical reduction of CO into valuable multi-carbon (C) chemicals holds promise for mitigating CO emissions and enabling artificial carbon cycling. However, achieving high selectivity remains challenging due to the limited activity and active sites of CC coupling catalysts. Herein, we report an Ag-modified Cu-oxide catalyst (CuO/Ag@C) derived from metal-organic frameworks (MOF), capable of efficiently converting CO to CH. The MOF-derived porous carbon confines the size of metal nanoparticles, ensuring sufficient exposure of active sites. Remarkably, the CuO/Ag@C catalyst achieves an impressive Faradaic efficiency of 48.6% for CH at -0.7 V vs. RHE, demonstrating excellent stability. Both experimental results and theoretical calculations indicate that Ag sites promote the production of CO, enhancing the coverage of *CO on Cu sites. Furthermore, the reconfiguration of charge density at the Cu-Ag interface optimizes the electronic states of the reaction sites, reducing the formation energy of the key intermediate *OCCHO, thereby favoring CH production effectively. This work provides insight into structurally rational catalyst design for highly active and selective multiphase catalysts.

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Source
http://dx.doi.org/10.1016/j.jcis.2024.10.014DOI Listing

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