Progress on the Oxygen Precipitation Performance of Transition Metal LDH Materials for Electrolytic Water Precipitation
Hydrogen energy,as a clean energy source,holds significant potential in addressing environmental pollution and energy shortages.Electrocatalytic water splitting,a sustainable hydrogen production technology,has gained considerable attention for its high efficiency and environmental benefits.However,the Oxygen Evolution Reaction(OER)at the anode often limits the overall water splitting rate due to its sluggish kinetics.Therefore,developing efficient OER catalysts is essential to improve the efficiency of water splitting.Layered Double Hydroxides(LDH)materials are highly promising for electrocatalytic water splitting because of their abundant active metal sites and tunable structural properties.Research on LDH materials has shown that y modifying and optimizing their structures can significantly enhance both their catalytic activity and stability in OER.Transition metal-based electrocatalysts,particularly those based on nickel,cobalt,and iron,offer distinct advantages in water electrolysis due to their abundant active sites,high surface area,and rapid electron transport.The OER activity of NiFe LDH was enhanced through the boron tungstate(BWO)anionic intercalation method,which induced irreversible lattice distortion.The D-NiFe LDH material exhibited an OER overpotential of 209 mV at a current density of 10 mA∙cm-2,and the overpotential reached 276 mV at a current density of 500 mA∙cm-2.Additionally,the electronic structure of the active site was tuned by constructing a heterostructure S-doped Co3Se4/Fe3Se4(S-Co3Se4/Fe3Se4),formed by the unique nanowire-nanosheet array of CoFe-LDH.Sulfur doping not only adjusted the electronic structure but also increased the number of active sites.In 1.0 mol ∙ L-1 KOH solution,S-Co3Se4/Fe3Se4 demonstrated excellent OER performance with an overpotential of 255 mV at a current density of 100 mA∙cm-2 and exhibited good stability.The electrocatalytic performance of LDH materials was significantly improved through various modification strategies,providing new opportunities for efficient and low-cost electrocatalytic water splitting technology.
layered double hydroxidestwo-dimensional materialsheterogeneous structuredefect engineeringheteroatom dopingmorphology controlhydrogen production from waterOER
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