Preparation method of black phosphorus/metal organic framework composite water splitting electrocatalyst

The invention discloses a preparation method of a black phosphorus/metal organic framework composite water splitting electrocatalyst, which comprises the following steps: preparing an ultrathin thin BP (FL-BP) by combining an electrochemical stripping method and an ultrasonic stripping method; adding the ultrathin thin layer BP into a methanol solution of cobalt acetate, adding a methanol solution of 2-methylimidazole while stirring, standing, centrifuging, washing with alcohol, and drying; and carrying out heat treatment on the obtained product in an inert atmosphere to obtain the black phosphorus/metal organic framework composite water splitting electrocatalyst. The method is mild and safe in reaction condition, high in product yield and low in production cost, and has good economic benefits and application prospects; the water splitting potential of the obtained black phosphorus/metal organic framework composite water splitting electrocatalyst at the current density of 10mA cm is as low as 1.64 V; af