Microelectrode with three-dimensional structure as well as preparation method and application of microelectrode

The invention provides a three-dimensional structure microelectrode and a preparation method and application thereof.The electrode comprises a first layer, a second layer and a third layer which are sequentially arranged from inside to outside, the first layer is a substrate, and the substrate comprises foam metal; the second layer comprises one of transition metal sulfide, transition metal oxide or transition metal selenide covering the surface of the foam metal, the third layer is one of transition metal sulfide, transition metal oxide or transition metal selenide, and the second layer and the third layer are made of different materials. And the second layer and the third layer can form a heterogeneous interface through chemical bonding. The three-dimensional structure microelectrode improves the chemical performance of the surface of the electrode, has no obvious influence on the inherent structure of the substrate material, has a better modification effect than oxidation reduction, and is good in stabilit