Fig. 5: Electrochemical CO2R on different polymer/Cu GDEs.
From: Selective and stable CO2 electroreduction at high rates via control of local H2O/CO2 ratio
a Polarization curves of the different polymer/Cu GDEs (with 85% iR compensation. The solution resistance for PT/Cu, PCR/Cu, PT95/Cu, PVDF/Cu and Nafion/Cu are 0.31 Ω, 0.35 Ω, 0.33 Ω, 0.31 Ω and 0.38 Ω, respectively). b C2+ FE and c overpotential on these polymer/Cu GDEs under the same current density. d C2+ partial current density. e H2 partial current density and f C2+ FE on these polymer/Cu GDEs under identical cathodic potentials. g stability of PT/Cu, Nafion/Cu and PVDF/Cu at −0.2 A cm−2 in 1 M KOH. h C2+ selectivity of PT/Cu and Nafion/Cu before and after stability test at −0.2 A cm−2 and −1 A cm−2 with 1 M KOH as the electrolyte. The stability tests were stopped when H2 FE higher than 15%. For panels a–f, the test conditions include 2 M KOH as the electrolyte, a CO2 flow rate of 24 sccm, and a catholyte flow rate of 2 mL/min. For all the tests in a flow cell, the anolyte flowrate is 5 mL/min. Regarding the cathodic potential in panel a, 85% iR correction was applied. For panels c–g, 100% iR correction was applied. Details regarding the iR correction can be found in the Method section. The solution resistances for all measurements in panels b–f were recorded and plotted in Supplementary Fig. 26a. The error bars in panel b, c and f represent standard deviations from at least three independent measurements. Relevant source data are provided as a Source Data file.
