▎ 摘　　要

NOVELTY - Preparing single atom catalyst comprises (a) preparing support on which heterogeneous element different from that of the catalytic material to be produced is formed on the surface, (b) adsorbing support to working electrode, (c) supporting working electrode to which support is adsorbed in mixed solution of single atom precursor and electrolyte and (d) forming single atom on support by applying voltage to mixed solution so that single atom precursor chemically bonds with heterogeneous element. USE - The method is useful for preparing single atom catalyst. ADVANTAGE - The method is capable of mass-producing highly uniform single atoms in a short time, improves stability and catalytic activity, is easy to mass-produce because there is no high-vacuum, high-temperature heat treatment process, has high electrochemical properties and excellent stability and produces hydrogen and carbon dioxide. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: ingle-atom catalyst prepared by above mentioned method; and ingle atom catalyst comprising support on which heterogeneous element different from that of the catalytic material to be produced is formed on the surface and single atom positioned on the support by chemical bonding with the heterogeneous element, where the heterogeneous element includes nitrogen, oxygen, sulfur, phosphorus and/or boron. DESCRIPTION OF DRAWING(S) - The diagram shows a flow chart of a method for preparing a single atom catalyst (Drawing includes non-English language text).