Ni2P

Ni2P, or nickel phosphide, is an inorganic intermetallic compound with the formula Ni2P. It is a metallic solid formed when nickel and phosphorus react at elevated temperatures and is one of several nickel phosphides studied for catalytic applications. The compound is valued for its catalytic activity and relatively low cost compared with noble metals.

Crystal structure and composition: Ni2P crystallizes in a hexagonal Ni2P-type structure, with nickel and phosphorus occupying distinct crystallographic sites. This arrangement gives Ni2P its characteristic electronic and structural properties that underpin its catalytic behavior.

Synthesis and preparation: Ni2P can be prepared by direct synthesis from nickel and phosphorus at high temperature under inert or reducing conditions, or by phosphorization of nickel on various supports. Nanostructured forms and dispersed versions on oxides or carbon supports are common for catalytic applications.

Properties: Ni2P is a good electrical conductor reflecting its metallic character. It is relatively chemically and thermally robust under reducing environments and is stable under many industrial conditions. The material can be made in various morphologies, including nanoparticles and supported catalysts, which enhance surface area and activity.

Applications: Ni2P and related nickel phosphides are widely studied as non-noble metal catalysts for hydrodesulfurization (HDS) and hydrodenitrogenation in petroleum processing. Supported Ni2P catalysts on Al2O3, SiO2, or carbon show activity for sulfur-containing compounds. In electrocatalysis, Ni2P-based materials are explored as catalysts for the hydrogen evolution reaction (HER) in acidic and alkaline media.

Safety: Handling Ni2P dust or phosphorus-containing compounds requires standard safety precautions. Nickel and phosphorus compounds can pose health risks if inhaled or ingested; use appropriate ventilation and personal protective equipment.