| Electrochemical hydrogen evolution is the conversion of electric energy into chemical energy which is easier to store and transport.And it is of great significance to the development and utilization of energy.Transition-metal phosphides?TMPs?possess good electrocatalytic activity due to its unique physical and chemical properties.Through appropriate improvement strategies,the electrocatalytic performance of TMPs can be effectively improved,making it a high efficiency electrocatalyst that can replace the noble metal-based electrocatalyst.This thesis focuses on the design and preparation of TMPs,and effectively improves its electrocatalytic activity by means of element doping and morphology control.And this thesis mainly includes the following two parts:?1?We demonstrated a two-step calcining strategy to synthesize a new excellent HER catalyst of MoP nanoparticles loading on the carbon hybrid frameworks substrate with nitrogen-doped?MoP@NCF?,which carbon source of MoP-based electrocatalysts comes from acetone for the first time.Ascribed to unique porous nanostructure with enormous specific surface area of 247.43 m2 g-1,and homogeneous distribution of ultrasmall MoP nanoparticles,the MoP@NCF exhibits outstanding electrocatalytic performance for the HER with low overpotential?of only 121.8 mV in acid and 129.5mV in alkaline electrolytes,respectively?at a current density of 10 mA cm-2.?2?A bifunctional electrocatalyst with peculiarly hierarchical iron-doped CoP heterostructures self-assembled on copper foam?CoFeP/CF?was synthesized via a facile hydrothermal-phosphidation pathway.CoFeP/CF demands the diminutive overpotentials?of 277.9 mV for OER and 152.6 mV for HER?to desire the current density of 50 mA cm-2 in alkaline electrolyte.Furthermore,CoFeP/CF exhibits outstanding electrochemical performance for the overall water splitting with the cell potential of 1.495 V to attain 10 mA cm-2 in a two-electrode cell. |
PDF Full Text Request