One-Dimensional Metal-Organic Framework for High-Efficiency Electrocatalytic Reduction of CO₂ to CO

Abstract

Electrocatalytic reduction of CO ₂ to valuable products possesses huge potential to alleviate environmental and energy crisis. It is well known that Ag favors the conversion of CO ₂ to CO but the exposed active sites and stability are still rather limited. In this study, a novel one-dimensional Ag-based metal-organic framework (1D Ag-NIM-MOF) was successfully synthesized and used in the electrocatalytic CO ₂ reduction reaction (CO ₂RR) for the first time. As a result, the Faradaic efficiency of CO achieved 94.5% with current density of 12.5 mA·cm ^-2 in an H-type cell and 98.2% with current density of 161 mA·cm ^-2 in a flow cell at -1.0 V (vs. RHE), which stands as a new benchmark of Ag-based MOFs in the electrocatalytic CO ₂RR. The excellent performance of 1D Ag-NIM-MOF is attributed to its peculiar one-dimensional structure, which is beneficial for diffusion of reactants and products, and exposure of much more catalytic sites. Compared to commercial Ag nanoparticles, 1D Ag-NIM-MOF exhibits superior electrocatalytic CO ₂RR performance with higher catalytic activity and stability.

Keywords

Metal-organic frameworks / Ag-based catalyst / One-dimensional material / Crystal engineering / Electrocatalysis / CO ₂ reduction

RIGHTS & PERMISSIONS

2024 SIOC, CAS, Shanghai, & WILEY-VCH GmbH