Anionic sulfur-modified FeNi-LDH at various Fe/Ni molar ratios for high-performance OER electrocatalysis

The sulfur-modified FeNi-LDH electrocatalyst is synthesized by a simple mixed ion electrodeposition method. The synthesized crystal grain has a diameter of less than 5 nm and has surrounded by an amorphous state. In the 1.0 M KOH electrolyte, S-Fe1Ni2-180 LDH showed significant activity on oxygen evolution reaction (OER), which this catalyst at a current density of 10 mA·cm−2, it only requires an overpotential of 228 mV. Besides, S-Fe1Ni2-180 LDH also shows impressive long-term stability and excellent electrical conductivity. The results show that the OER performance of the catalyst is significantly improved because the surface adsorbed S ions adjust the electronic structure and coordination environment of the active site.