Phase Electronic Structure Tuning via Pt, P-Doped Ni 4 Mo-Implanted Ti 4 O 7 for Highly Efficient Water Splitting and Mg/Seawater Batteries.

Fine-tuning nanoscale structures, morphologies, and electronic states are crucial for creating efficient water-splitting electrocatalysts. In this study, a method for electronic structure engineering to enhance overall water splitting in a corrosion-resistant electrocatalyst matrix by integrating Pt, P dual-doped Ni 4 Mo electrocatalysts onto a Ti 4 O 7 nanorod grown on carbon cloth (Pt, P-Ni 4 Mo-Ti 4 O 7 /CC) is introduced. By optimizing platinum and phosphorus concentrations to 1.18% and 2.42%, respectively, low overpotentials are achieved remarkably: 24 mV at 10 mA cm -2 for the hydrogen evolution reaction and 290 mV at 20 mA cm -2 for the oxygen evolution reaction in 1.0 m KOH. These values approach or surpass those of benchmark Pt-C and IrO 2 catalysts. Additionally, the Pt, P-Ni 4 Mo-Ti 4 O 7 /CC bifunctional electrocatalyst displays low cell potentials across various mediums, maintaining excellent current retention (96% stability after 40 h in mimic seawater at 20 mA cm -2 ) and demonstrating strong corrosion resistance and suitability for seawater  electrolysis. As a cathode in magnesium/seawater batteries, it achieves a power density of 7.2 mW cm -2 and maintains stability for 100 h. Density functional theory simulations confirm that P, Pt doping-assisted electronic structure modifications augment electrical conductivity and active sites in the hybrid electrocatalysts.