Abstract
Owing to strong Fe-P interaction that differs the electron distribution beneath metal/phosphide interface of Fe-P alloy,the charge transfer of Fe-P alloy has been accelerated during the electrocatalytic oxidation process and improved the efficiency and durability of overall water splitting.In this work,a novel metal-lurgical technology in combination with smelting reduction and Single Roller Melting Spinning(SRMS)for the purpose of electrochemical overall water splitting where High-phosphorus Oolitic Iron Ore(HPOIO)has been directly used as the main raw material is developed for preparing amorphous Fe-P alloys strips.The rational modulation on the Fe/P ratio can alter the crystal structure and crystallinity of Fe-P alloy,favor electron transfer,and further trap the positively charged H+.The obtained FeP electrocatalyst ex-hibits 436 and 527 mV at 10 mA cm-1 with Tafel slopes of 102.3 and 77.2 mV dec-1 for HER and OER in 1.0 mol/L KOH solution,respectively,especially with long-term stability(～207 h for HER and～42 h for OER).Specifically,the DFT calculation displaying structural advantages and componential superiorities exhibited that P in Fe-P amorphous alloy regulated by systematic P addition optimization might increase the energy density in the Fermi level.Furthermore,the phosphorus content brought about high active surface areas,low impedance,and variable reaction paths-caused low reaction energy barriers with the improved amorphicity and absorption and desorption of intermediates,thereby boosting the overall wa-ter splitting activity.This study displays a novel strategy to develop Fe-P amorphous alloy for the stable and efficient overall water splitting.
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