Dye-sensitized solar cell (D-SSC) is composed of a dye-sensitized TiO2 photo-anode, an electrolyte containing the iodide/tri-iodide redox couple, and a counter electrode. As an important part in D-SSC, the counter electrode (CE) is responsible for electron transfer from the external circuit back to the redox couple and catalyzing the reduction reaction of the I3^- species in the electrolyte. The use of conventional Pt-based CEs reveals critical issues such as high cost, relative scarcity, and the requirement for mandatory high-temperature calcination. Herein, for the first time, Ni₃S₄ was synthesized and deposited on the FTO substrate using the facile potentiodynamic electrodeposition. The prepared FTO/Ni₃S₄ electrode exhibited an excellent chemical stability toward I^-/I3^- redox electrolyte and displayed the significantly enhanced electrocatalytic activity, resulting in much higher cell efficiency (8.17 %), as compared to Pt CE (7.58 %), when applied to N719-based D-SSCs.