Electrocatalyst and method of preparing the same

A method of preparing an electrocatalyst, the method comprising:

• performing a pyrolysis of a metal-organic framework (MOF) precursor, containing metal oxide clusters and organic materials, and a metal catalyst,
• wherein, based on the pyrolysis of the MOF structure due to thermal treatment, the organic materials form a carbon substrate, the metal oxide clusters form metal oxide particles dispersed on the carbon substrate, and metal of the metal oxide particles is substituted with the metal catalyst or the metal catalyst is adsorbed on the metal oxide particles.