Fig. 3: Operando XAFS characterization of Cu/N0.14C. | Nature Communications

Fig. 3: Operando XAFS characterization of Cu/N0.14C.

From: Complementary Operando Spectroscopy identification of in-situ generated metastable charge-asymmetry Cu2-CuN3 clusters for CO2 reduction to ethanol

Fig. 3

a Cu K-edge operando XANES of Cu/N0.14C from OC to −1.4 V vs. RHE in 0.1 M KHCO3. b Operando FT-EXAFS of Cu/N0.14C. c Wavelet transforms for the k3-weighted Cu K-edge EXAFS signals at OC, −1.1 V and −1.4 V vs. RHE during the CO2RR. d The relationship of Cu/N0.14C absorption edge, CN of first shell, CN of second shell and the potential. e Operando FT-EXAFS of Cu/N0.14C after the applied potential was switched off and other conditions remained unchanged. f Proposed scheme for the reversible formation of the catalytically active Cun–CuN3 cluster based on operando XAS and Quasi-in-situ XPS analysis (rufous, O; gray, C; purple, N; blue, Cu bond to both N and Cu; green, Cu just bond to Cu). All potentials are normalized to RHE.

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