Highly active and stable stepped Cu surface for enhanced electrochemical CO2 reduction to C2H4

Residual Chlorine Induced Cationic Active Species on a Porous Copper Electrocatalyst for Highly Stable Electrochemical CO2 Reduction to C2+

“…Therefore,w ecarried out consecutive electrocatalysis cycles to determine the long-term CO 2 RR stability of e-CuOHFCl catalyst in H-cell at À1.00 V RHE . [16,22] Ahigher current density was observed for the first electrocatalysis cycle (Figure 2d), which is likely due to the reduction of CuOHFCl to metallic Cu (Figure S7). [22] Ther est electrocatalysis cycles showed relatively stable current densities.W hile the corresponding quantity of charge that passed through the interface of electrode indicated as light decline in the activity during the whole stability test of 240 h( Figure 2d).…”

“…[13a,14a] Ar ecent study demonstrated that at hicker and smoother Cu x Op rotective layer obtained by controlled surface oxidation could inhibit the disintegration of Cu nanowires and improve its catalytic stability to more than 22 h. [15b] In this study,i tw as demonstrated that abundant active sites that were induced under CO 2 RR conditions were well-retained even after 240 ho felectrocatalysis,w hich may be due to the thermodynamical stability of these active sites under CO 2 RR conditions. [16] Thew ell-preserved sheet-like morphology with porous and layered structure would also facilitate the exposure of active sites.O nt he other hand, it was found that the copper oxidation state changed with the applied potentials as well as the time under reaction conditions. [17b] In this context, the stability of cationic Cu species (Cu + or Cu 0 -Cu + )are also of great importance for the catalytic stability in CO 2 RR.…”

“…[15] Recently,aCu nanowire catalyst was reported to maintain ah igh selectivity toward C 2 H 4 for over 200 hours of electrocatalysis,p ointing out the importance of stable stepped sites that formed through in situ during electrochemical activation. [16] Therefore,i ti so fg reat importance to maintain the stability of catalyst structure and active sites for improving the catalytic performance of Cu-based CO 2 RR electrocatalysts.O nt he other hand, although the conclusion is still pending, the crucial role of oxidized Cu species for the improvement of C 2+ production has been widely investigated. Given the positive relevance between oxidized Cu species and C 2+ production, the stability of oxidized Cu species is important for maintaining high selectivity of C 2+ products.…”

Born to be different: the formation process of Cu nanoparticles tunes the size trend of the activity for CO2 to CH4 conversion

“…These adsorption sites display a lower coordination than the one of atoms on (111) surfaces. 1,[72][73][74][75] Employing a volcano relationship between coordination and activity, which peaks at low aGCN, values may in turn also help in the design of Cu catalysts active for CO conversion into C 2 products.…”

How to select effective electrocatalysts: Nano or single atom?

“…synthesized copper nanowires with a rich stepped surface structure (A‐CuNW) by in situ electrochemical activation method using a Cu nanowire (Syn‐CuNM) as the precursor, and realized the high‐efficiency electrocatalytic reduction of carbon dioxide to C 2 H 4 . [ 86 ] Syn‐CuNM has a smooth surface and a one‐dimensional structure, with an average diameter of 25 ± 7.7 nm. However, A‐CuNW has a highly uneven surface and a one‐dimensional structure.…”