Electrochemical sensor for detecting estradiol as well as preparation method and application of electrochemical sensor

The invention relates to the technical field of electrochemical analysis, particularly discloses an electrochemical sensor for detecting estradiol as well as a preparation method and application of the electrochemical sensor. A chemically modified electrode of the electrochemical sensor for detecting the estradiol is a working electrode; the preparation method of the chemically modified electrode comprises the following steps: firstly, preparing a nitrogen-doped reductive graphene oxide; secondly, taking the nitrogen-doped reductive graphene oxide (N-RGO) and dispersing the nitrogen-doped reductive graphene oxide with water to obtain a solution I; dispersing PdC12 with water to obtain a solution II; taking NaBH4, and dissolving the NaBH4 with water to form a solution III; thirdly, dropwise adding the solution II and the solution III into the solution I respectively and then standing for 30 minutes or above; carrying out centrifugation and purification to obtain palladium-nitrogen-doped reductive graphene oxid