Fig. 2: Characterizations and performance of Zn and Ni(OH)2/NiOOH electrodes.
From: Integrating hydrogen utilization in CO2 electrolysis with reduced energy loss
a XRD patterns; SEM images of b Cu foam and c Zn-Cu-500, the inset compares the optical images of Cu foam before and after Zn deposition; d Potential-dependent Faradaic efficiency for CO generation (the error bar represents standard deviation from three independent measurements); e Plots of jCO as a function of potential bias during CO2RR; f LSV curves of Ni(OH)2 and Co3O4 electrodes (the solution resistance was 1.25 ~ 1.35 Ω); g Tafel plots of NiOR and OER; h Nyquist plots of Ni(OH)2 electrode acquired at 1.40, 1.50, 1.65, and 1.80 V vs. RHE; i Nyquist plots of Ni(OH)2/NiOOH electrode acquired at different DoC at 1.55 V vs. RHE, charging is defined as the Ni(OH)2-to-NiOOH conversion; j Nyquist plots measured at 1.55 V vs. RHE of Ni(OH)2/NiOOH electrode (DoC = 0% and =100%) and Co3O4. All solid black lines in Nyquist plots represent the fitting results based on the equivalent circuit, where Rs is the solution resistance, CPE is the constant phase element, Rct is the charge-transfer resistance and RW is the Warburg impedance. Source data are provided as a Source Data file.
