The present invention, Cu can be used for the NH 3 synthesizing catalyst 1.81 S and use them to provide a method for synthesis of NH 3. According to the invention, it is possible to provide Cu 1.81 S copper sulfide compound catalysts which can be used to increase the efficiency of the NH 3 synthesis, but using an electrochemical nitrogen reduction to the NH 3 synthesis, to find the corresponding nitrogen-reduction reaction A copper sulfide compound catalyst capable of lowering the energy level of the required limiting potential (U L) and a NH 3 synthesis method using the same can be provided, and any of the two different routes in the nitrogen reduction reaction for NH 3 synthesis It is possible to provide a copper sulfide compound catalyst in which one can proceed and a NH 3 synthesis method that can exhibit higher nitrogen reduction activity based on this.
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