Size-dependent magnetic and electrocatalytic properties of nickel phosphide nanoparticles

- Ni2P nanoparticles (NPs) with different sizes were synthesized via thermal decomposition of single-source precursor.
- The size of Ni2P NPs can easily be controlled by changing reaction temperature.
- The smaller Ni2P NPs exhibit superparamagnetism and the larger Ni2P NPs exhibit ferromagnetic characteristic at 300 K.
- The Ni2P NPs with small size exhibit higher electrocatalytic activity for the HER.
- The magnetic and electrocatalytic properties of the Ni2P NPs are size-dependent.