Hierarchical porous NiFe-P@NC as an efficient electrocatalyst for alkaline hydrogen production and seawater electrolysis at high current density

The TNiFe-P@NC presented excellent HER performance with an overpotential of 40 mV at 10 mA cm −2 and excellent stability in KOH solution. An assembled NiFe-P@NC||NiFe-P@NC electrolyzer could drive 100/500 mA cm −2 in alkaline seawater electrolyte at 1.77/1.93 V.