Common-Ion Effect Triggered Highly Sustained Seawater Electrolysis with Additional NaCl Production
Electrochemical performance of the NiCoFeP electrode. (a–c) CV curves of NiCoFeP and commercial catalysts for HER, OER, and overall water splitting after compensation. (d) The generated amounts of H2 and O2 from water electrolysis using NiCoFeP array as the cathode and anode electrodes at different time intervals with the current density of 500 mA/cm2 in 6 M NaOH + NaCl (Sat. ~2.8 M) electrolyte and corresponding yield of NaCl crystals (e) during the water electrolysis. Error bars represent standard deviations from multiple measurements. (f) XRD pattern of the product formed (NaCl) in the electrolyte after electrolysis, and the inset in the digital image depicts the NaCl crystals at the bottom of the electrolyzer. (g) Chronopotentiometry curve of OER (NiCoFeP) for 60 minutes at the current density of 200 mA/cm2 using different electrolytes with compensation, indicating that the stability can be improved by suppressed Cl- concentration. (h) Chronopotentiometry curve of overall water splitting (NiCoFeP) for 100 h at different current densities with compensation using 6 M NaOH + NaCl (Sat. ~2.8 M) and Ca/Mg-free seawater (real seawater pretreated by NaOH and Na2CO3) as the electrolyte.
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