Stable and efficient seawater splitting on a porous phosphate-intercalated NiFe (oxy)hydroxide@NiMoO4 core-shell micropillar electrode

Seawater splitting powered by solar or wind sources is a significant renewable energy storage technology for the production of green hydrogen energy. However, both chlorine evolution reaction and chloride corrosion are intractable issues in seawater splitting. Here, porous electrode based on phosphate-intercalated NiFe (oxy)hydroxide shell coated nickel molybdate (NiMoO4) micropillar core (denoted as P-NiFe@NiMoO4) synthesized through an electrochemical oxidation strategy. During process, etching MoO2 promotes reconstruction formation structures alkaline solution. The optimized P-NiFe@NiMoO4 electrocatalysts afford low overpotential 258 mV at current density 100 mA/cm2 seawater. By pairing anode with cathode as-synthesized P-NiMoO, electrolyzer presents voltage 1.63 V excellent stability. Moreover, remarkable stability seems to be attributed in-situ phosphate formed during process passivate corrosion.