Metal–organic framework-mediated strategy for enhanced methane production on copper nanoparticles in electrochemical CO2 reduction

Highly Selective CO2 Electroreduction to CH4 by In Situ Generated Cu2O Single‐Type Sites on a Conductive MOF: Stabilizing Key Intermediates with Hydrogen Bonding

“…As shown in Figure 3 b, only CH 4 , CO, C 2 H 4 , and H 2 were detected by GC and no liquid product was found in 1 H NMR. Interestingly, high selectivity of 73 % at −1.4 V towards CH 4 was achieved for Cu 2 O@CuHHTP (Figure 3 b), which is one of the several highly selective Cu‐based catalysts (Supporting Information, Table S1) [20, 22, 36–46] . In contrast, the pristine CuHHTP shows poor CH 4 selectivity and affords a large amount of H 2 (Supporting Information, Figure S10), strongly indicating that the CO 2 RR activities were originated from Cu 2 O quantum dots but not CuHHTP.…”

Highly Selective CO2 Electroreduction to CH4 by In Situ Generated Cu2O Single‐Type Sites on a Conductive MOF: Stabilizing Key Intermediates with Hydrogen Bonding

“…More importantly, the reduction of Cu centers to Cu 2 O releases abundant uncoordinated hydroxyl groups nearby active sites, which can form hydrogen bonds with intermediates and lower the energy barrier towards the formation of CH 4 . As a result, the obtained Cu 2 O@CuHHTP exhibited outstanding CO 2 RR performance with 73 % Faradaic efficiency of the conversion from CO 2 to CH 4 , outperforming most electrocatalysts (especially MOF‐based catalysts) in reported works (Supporting Information, Table S1) [19, 20, 22, 36–46] …”

“…To achieve high selectivity of CH 4 with large current density in CO 2 RR, several factors should be considered. Firstly, Cu‐based catalysts are usually composed of multiple species such as Cu, Cu 2 O, CuO, and Cu(OH) 2 , which could produce different types of products and lead to low selectivity for CH 4 [21, 22] . So, constructing copper‐based electrocatalyst with single type of active site is quite important to achieve high selectivity of CH 4 [23, 24] .…”

Engineering Metal–Organic Frameworks for the Electrochemical Reduction of CO2: A Minireview

“…Kim et al. employed an electrochemical reduction strategy for the decomposition of MOFs, thereby obtaining an efficient electrocatalyst for the synthesis of CH 4 . They chose copper‐based MOF‐74 as the precursor, which was electrochemically reduced into copper nanoparticles (NPs).…”