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Transition metal phosphides are arguably the most promising non-precious metal-based materials for hydrogen evolution reaction (HER). Unfortunately, their high preparation temperature usually results in particle sintering. It is challenging to achieve the ultra-dispersion of transition metal phosphide nanoparticles on conductive supports so as to enlarge their surface areas and reinforce their physical stability. In this study, we prepare fine MoP nanoparticles uniformly dispersed on hierarchical carbonaceous scaffolds by using strongly interacting Mo, P and C precursors. The resultant hybrid product possesses a three-dimensional open structure that allows a large fraction of MoP nanoparticles electrochemically accessible and suppresses their possible agglomeration during extended electrocatalysis. Electrochemical measurements show that the product has an impressive HER activity, only requiring an …