Flower like defect-rich Fe-doped Ni2P with phosphorus vacancies as electrocatalyst for oxygen evolution reaction

초록

we synthesized phosphorus vacancy-rich Fe-doped Ni2P microflower using simple hydrothermal, phosphidation, and partial reduction procedure. First, flower-like NiFe-LDH was synthesized by hydrothermal method with Ni2+, Fe2+, Urea and ammonium fluoride. Consequently, the NiFe-LDH was calcined with NaH2PO2 under Ar flow to prepare Fe-doped nickel phosphide (Fe-Ni2P). Finally, the Fe-Ni2P was annealed under H2/Ar flow to form phosphorous vacancy-rich Fe-doped Ni2P (Fe-Ni2P-VP). The synergistic effect of the Fe doping and phosphorus vacancy in the Fe-Ni2P-VP was investigated by physicochemical and electrochemical analysis. The obtained Fe-Ni2P-VP electrocatalysts showed excellent electrocatalytic activity with a low overpotential of 289 mV to deliver a current density of 10 mA cm?2, a small Tafel slope of 54.7 mV dec?1. Furthermore, the Fe-Ni2P-VP exhibited remarkable long-term durability over 100 h of the potential-time test. This work will offer new insights for preparation of defect-rich non-noble metal-based materials with enhanced electrocatalytic performance for upcoming energy storage and conversion system.