Phosphorus-Doped FeNi Alloys/NiFe2O4 Imbedded in Carbon Network Hollow Bipyramid as Efficient Electrocatalysts for Oxygen Evolution Reaction

Ni/Fe-based bimetallic nanoarchitecture materials play an important role in the development of non-precious-metal-based electrocatalysts toward water splitting, but the low activity and poor stability greatly hinder their commercial applications. It is significant to explore facile and effective methods to improve their electrocatalytic activity. A simple self-template strategy is demonstrated to fabricate a hollow bipyramid constructed by P-doped FeNi alloys/NiFe2O4 nanoparticles encapsulated in carbon network (P-Ni0.5Fe@C). Bimetallic analogous MIL-101 (Fe) precursor (Ni0.5Fe-BDC CP) with uniform morphology and stable structure was synthesized through a solvothermal reaction. By subsequent carbonization and phosphorization steps, P element was doped into the composite FeNi alloys/NiFe2O4 nanoparticles. Benefiting from the efficient mass and electron transfer of the hollow structure, the precise adjustment for the electron structure of P dopants, and carbon-encapsulated active components that could provi...