In this study, we synthesized new iron-doped nickel cobalt phosphate nanofi bers, deposited them on nickel foam (NF),

and deployed them as active catalysts for oxygen evolution reactions (OERs), hydrogen evolution reactions (HERs), and

overall water splitting. Our catalyst, the Fe-doped nickel cobalt phosphate nanofi ber at 1.05 Fe atom% (Fe-1.05), exhibited a

Brunauer–Emmett–Teller surface area (BET SA) of 57.0 m 2 g −1 and a Barrett−Joyner−Halenda (BJH) mesopore of 3.7 nm.

Because of its large surface area and mesopore architecture, which facilitate ionic diff usion, NF-deposited Fe-1.05 (Fe-1.05@

NF) exhibited exceptional OER (η = 234 mV @ 10 mA cm −2 ) and HER ( η = 104 mV @ 10 mA cm −2 ) performance. Overall

water splitting analysis showed the lowest potentials of 1.59, 1.76, and 1.86 V at 10, 50, and 100 mA cm −2 , respectively.

These results show the superior OER and HER performance of Fe-1.05@NF over that of the best-performing nickel cobalt

phosphates and their Fe-dopped analogs in the literature. A stability test for overall water splitting for 100 h in a 1-M KOH

electrolyte at a current density of 100 mA cm −2 demonstrated remarkable durability. The enhanced electrochemical activity

of Fe-1.05@NF can be attributed to the synergistic eff ect between the metal atoms and phosphate ligands, which facilitates

favorable conditions for the adsorption and oxidation of electrolyte ions, enhanced electrical conductivity, and active site

availability due to Fe (dopant) metal atoms, providing a nanostructured (nanofi ber) morphology with high porosity.