Integrating electrophilic and nucleophilic dual sites on heterogeneous bimetallic phosphide via enhancing interfacial electronic field to boost hydrazine oxidation and hydrogen evolution

Abstract

Integrating dual sites of hydrazine oxidation reaction (HzOR) and hydrogen evolution reaction (HER) into a catalyst is highly desirable for energy-saving hydrogen production but remains challenges. Herein, we fabricate a heterogeneous nanowire array consisting of CoP and N-doped Ni5P4 on carbon fiber paper (N-Ni5P4@CoP/CFP), in which the N atoms can be selectively incorporated into Ni5P4 to change the Ni coordination that can regulate interfacial electronic field and thus improve the charge transfer from CoP to N-Ni5P4. Such an interfacial charge redistribution can induce the formation of well-defined electrophilic and nucleophilic sites, which could optimize hydrazine dehydrogenation kinetics and hydrogen adsorption free energy (ΔGH*), thus achieving splendid HzOR and HER activities. The commercial solar cells and homemade lemon batteries driven overall hydrazine splitting (OHzS) electrolyzer inspires its practical applications. Integrating the electrophilic and nucleophilic dual sites via interfacial electronic field regulation provides a new inspiration for efficiently catalyzing HzOR and HER.