General method for the synthesis of FeCoNiCu-based high-entropy alloy and their application for electrocatalytic water splitting

A preparation method of a FeCoNiCu-based high-entropy alloy catalytic material for electrolysis of water, comprising the following steps:

• (1) preparation of nanofibers comprising four elements of Fe, Co, Ni and Cu and one or more elements of Sn, Mn and V:
• adding precursors of the elements of Fe, Co, Ni and Cu, a precursor (precursors) of one or more elements of the Sn, Mn and V, and a polymer material into a carbon fiber precursor solution, and stirring the mixture uniformly to obtain a mixed solution;
• and then spinning the mixed solution by electrospinning to obtain nanofibers comprising four elements of the Fe, Co, Ni and Cu and one or more elements of the Sn, Mn and V;
• and
• (2) preparation of FeCoNiCu-based high-entropy alloy nanoparticle electrocatalytic material:
• calcining the nanofibers prepared in step (1), and carrying out preoxidation by raising the temperature to 230° C.-280° C. at a heating rate of 10-30° C./min and holding the temperature for 1-3 hours in an air atmosphere;
• after the completion of the holding, carrying out carbonization by raising the temperature to 800-1200° C. at a rate of 10-30° C./min in an inert gas atmosphere and holding the temperature for 1-3 hours;
• and after the completion of the holding, cooling the nanofibers to room temperature under the protection of inert gas to obtain the FeCoNiCu-based high-entropy alloy nanoparticle electrocatalytic material.