A Metal–Organic Framework derived Cu_xO_yC_z Catalyst for Electrochemical CO₂ Reduction and Impact of Local pH Change

Abstract

Developing highly efficient and selective electrocatalysts for the CO 2 reduction reaction to produce valueadded chemicals has been intensively pursued. We report as eries of Cu x O y C z nanostructured electrocatalysts derived from aC u-based MOF as porous self-sacrificial template. Blending catalysts with polytetrafluoroethylene (PTFE) on gas diffusion electrodes (GDEs) suppressed the competitive hydrogen evolution reaction. 25 to 50 wt %t eflonized GDEs exhibited aF aradaic efficiency of % 54 %f or C 2+ products at À80 mA cm À2 .The local OH À ions activity of PTFE-modified GDEs was assessed by means of closely positioning aP tnanoelectrode.Asubstantial increase in the OH À /H 2 Oactivity ratio due to the locally generated OH À ions at increasing current densities was determined irrespective of the PTFE amount.

Redox Replacement of Silver on MOF‐Derived Cu/C Nanoparticles on Gas Diffusion Electrodes for Electrocatalytic CO2 Reduction

“…The SEM images in Figures 1 a and b show that the octahedral morphology of HKUST crystals (size of ∼60±20 μm) was well preserved as a template even after the long‐term carbonization process (size of ∼15±5 μm); this is consistent with results from literature. [ 22 , 23 ] A higher magnification view of one of these octahedral microparticles revealed that each octahedron microparticle consisted of ∼80±20 nm spherically shaped CuNPs (Figures 1 c and S3). A more detailed investigation of the structural properties was performed by transmission electron microscopy (TEM) to characterize the composition of individual CuNPs.…”

“…This can be attributed to the absence of a large carbon matrix, which generally contributes to micro/macroporosity during pyrolysis (Figure S5). [23] …”

Toward High‐Performance CO2‐to‐C2 Electroreduction via Linker Tuning on MOF‐Derived Catalysts

“…Main eCO 2 RR products were identified as CO at low current density and C 2 H 4 at high current density. For the NH 2 -Cu-BDC and OH-Cu-BDC [2,12,[27][28][29][30][31][32][33] (Table S1, Supporting Information). Black square for the results in the literature.…”

“…2F-Cu-BDC ranks high in the comparison with the prior best results in literature. [2,12,[27][28][29][30][31][32][33] It also should be noted that although a few catalysts exhibit high R C2/C1 (such as ref. [ 33 ]), their current densities are impractical (<15 mA cm -2 ).…”

“…b) The ratios of FEs for C 2 and C 1 products of X-Cu-BDC at different applied current densities. c) Performance of X-Cu-BDC compared with recent reports[2,12,[27][28][29][30][31][32][33] (TableS1, Supporting Information). Black square for the results in the literature.…”