17), in accord Together with the lowered coordination quantity observed in XAS (Supplementary Fig. 13). The floor chemical states of Cuδ+NCN and CuNCN soon after going through CO2RR for different times ended up even more analyzed by XPS (Supplementary Fig. eighteen). The C-N coordination could be Obviously observed around the surface of Cuδ+NCN, whereas for CuNCN, C-N is nearly not observed to the area because of the loss of the [NCN]two− moiety (Supplementary Fig. 18a, b), which agrees with the effects of EDS. The valence alterations of Cu noticed from operando XAS are also verified from Cu 2p high-resolution XPS and Cu LMM spectra (Supplementary Fig. 18d, e). When going through CO2RR for different reaction occasions, Cu reduction in CuNCN is Plainly detected, whereas Cuδ+NCN can manage its area chemical point out even following a very long time of response because of the safety in the oxidation point out of strong σ-donation result and composition transformation of [NCN]2– twenty five. The operando XAS along with put up characterization study disclosed a vital phenomenon within our catalyst, that is the coexistence of stabilized Cu0-Cu1+ twin internet sites by cyanamide framework beneath the response circumstances and that may be stable maintained even for the duration of and right after CO2RR.
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CuNCN was synthesized in an analogous fashion to Cuδ+NCN, besides that hydrazine was not additional during the synthesis.
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