In 2016, we developed a new method to engineer well-distributed dicobalt phosphide (Co2P) nanoparticles encapsulated in N, P-doped graphene (Co2P@NPG) as electrocatalysts for hydrogen evolution reaction (HER). We fabricated such nanostructure by absorption of initiator and functional monomers, including acrylamide and phytic acid on graphene oxides, followed by UV-initiated in situ polymerization, then by adsorption of cobalt ions and finally calcination to form N, P-doped graphene structures. Besides, we have also successfully fabricated other kinds of TMPs@Carbon nanostructures, including Fe2P@NPG, Ni2P@NPG and Pd5P2@NPG.  More details in "Polymer-Embedded Fabrication of Co2P Nanoparticles Encapsulated in N, P-Doped Graphene for Hydrogen Generation"