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

Abstract

Electrochemical carbon dioxide (CO 2 )r eduction reaction (CO 2 RR) is an attractive approach to deal with the emission of CO 2 and to produce valuable fuels and chemicals in ac arbon-neutral way.M any efforts have been devoted to boost the activity and selectivity of high-value multicarbon products (C 2+ )o nC u-based electrocatalysts.H owever,C ubased CO 2 RR electrocatalysts suffer from poor catalytic stability mainly due to the structural degradation and loss of active species under CO 2 RR condition. To date,most reported Cu-based electrocatalysts present stabilities over dozenso f hours,w hich limits the advance of Cu-based electrocatalysts for CO 2 RR. Herein, ap orous chlorine-doped Cu electrocatalyst exhibits high C 2+ Faradaic efficiency (FE) of 53.8 %at À1.00 Vv ersus reversible hydrogen electrode (V RHE ). Importantly,the catalyst exhibited an outstanding catalytic stability in long-term electrocatalysis over 240 h. Experimental results show that the chlorine-induced stable cationic Cu 0 /Cu + species and the well-preserved structure with abundant active sites are critical to the high FE of C 2+ in the long-term run of electrochemical CO 2 reduction.

Cu2+1O/Ag Heterostructure for Boosting the Electrocatalytic Nitrate Reduction to Ammonia Performance

“…41,42 In contrast to the peak displacement of Cu, the main peak of Ag moves toward the high binding energy, indicating that Ag is the electron donor. 35,40 To further indicate the valence state in which the copper element is located, a Cu LMM (a transition form producing the Auger spectrum) Auger spectrum test was performed, as shown in Figure S4, where the peak appearing at 570 eV is attributed to Cu + , while the presence of Cu 0 was not observed, 43,44 being consistent with the XRD results. The peak at 573.1 eV represents different transition states of the Cu LMM spectrum.…”

Targeted Regulation of the Electronic States of Nickel Toward the Efficient Electrosynthesis of Benzonitrile and Hydrogen Production

“…Typically, the adsorption and activation of the reactant molecules on the active sites largely depend on the electronic structure of the catalyst. , As a result, the regulation of the electron state of active sites will tune the behavior of adsorption and desorption for intermediates, which will significantly affect the activity, selectivity, and even stability of the relevant reaction. − For BOR, in consideration of the character of benzylamine, especially for the unequal hybridization of NH 2 in the amine group (nucleophile), the electrophilic active sites are required . Furthermore, the C–N bond dehydrogenation into a CN bond also plays an important role in the formation of nitrile .…”

A Membrane Reactor with Microchannels for Carbon Dioxide Reduction in Extraterrestrial Space

“…As shown in Figure 5d, X-ray Auger Cu LMM spectra were adopted to identify Cu (Ⅰ) and Cu (0). Two peaks were found at 918.4 eV and 916.8 eV, which were ascribed to Cu (0) and Cu (Ⅰ), respectively [19,20]. Combining the results of XRD and XPS, we can confirm that the Cu element on the surface was mainly in the form of Cu (Ⅱ) and Cu (Ⅰ), while the Cu element in the bulk was Cu (0).…”