Method of making copper sulfide electrode material

A method of making copper sulfide electrode material comprising steps of:

• 1) stirring and dissolving copper(ii) nitrate hydrate (C(NO3)2.3H2O) and Thiourea (CH4N2S) in a mixed solution consisting of ethylene glycol and deionized water, wherein a molar ratio of the C(NO3)2.3H2O and the CH4N2S is 1:2.5, the mixed solution consists of 10 mL ethylene glycol and 30 mL deionized water, thus producing a mixture A;
• 2) adding hexadecyl trimethyl ammonium bromide (C19H42N.Br) to the mixture A, wherein a stirring time of the mixture A and the C19H42N.Br is 5 minutes to 50 minutes to obtain a mixture B;
• 3) placing the mixture B into a roaster, raising a temperature of the roaster to 100° C. to 180° C. so that the mixture B reacts in the roaster to produce crude copper sulfide (CuS) after 10 hours to 18 hours;
• 4) washing the crude CuS by using a mixed fluid of ethanol absolute (C2H6O) and deionized water, wherein the crude CuS is cooled in a room temperature and is placed in the roaster, and a temperature of the roaster is raised within 50° C. to 80° C. so as to dry the crude CuS within 3 hours to 24 hours, thus producing the copper sulfide electrode material;
• 5) producing cathode electrode of asymmetric capacitive deionization module by using the copper sulfide electrode material;
• 6) producing anode electrode of the asymmetric capacitive deionization module by using activated carbon electrode material;
• and
• 7) connecting current collector a, first titanium strip b, the cathode electrode c of copper sulfide, non-woven fabric d, silicone gasket e, non-woven fabric d, and the anode electrode c′ of activated carbon, a second titanium strip b and a second current collector a in sequence from left to right to produce the asymmetric capacitive deionization module.