Fig. 4: Identification of the reaction mechanism and Cl- resistance.
From: MXene-Assisted NiFe sulfides for high-performance anion exchange membrane seawater electrolysis
a Polarization curves with 85% iR compensation (The scan rate is 5 mV s−1, and the resistance is 0.15 ± 0.01 Ω) measured in KOH electrolytes at different pH values (left) and j at 1.50 V vs. RHE plotted in log scale as a function of pH (right) of (Ni,Fe)S2@Ti3C2 and (Ni,Fe)S2. b Polarization curves in 1.0 M KOH and 1.0 M TMAOH (left) with 85% iR compensation (The scan rate is 5 mV s−1, and the resistance is 0.15 ± 0.01 Ω) and changes of overpotential at 0.5 A cm−2 (Δη0.5A) and Tafel slopes from KOH to TMAOH (right) of (Ni,Fe)S2@Ti3C2 and (Ni,Fe)S2. c Raman spectra of (Ni,Fe)S2@Ti3C2 and (Ni,Fe)S2, measured after running at 1.55 V vs. RHE for 1 h in 1.0 M KOH and 1.0 M TMAOH. d Projected density of states (EF: Fermi level, εO-2p: O2p band center) and (e) Schematic band diagrams of NiFeOOH@Ti3C2-xOx and NiFeOOH. f Calculated free energies of OER steps on NiFeOOH@Ti3C2-xOx and NiFeOOH. g Mechanism change from AEM to LOM after the introduction of Ti3C2. h The adsorption energy for *Cl of NiFeOOH@Ti3C2-xOx and NiFeOOH.
