Ni3S4/CoS2 mixed-phase heterogeneous nanocomposite was synthesized by the one-step hydrothermal route and used as the counter electrode material in Pt-free dye-sensitized solar cells (DSSC). The various analytical tools used to characterize the sample illustrate the formation of mixed phases of Ni3S4/CoS2. The cyclic voltammetry result of Ni3S4/CoS2 mixed-phase heterogeneous nanocomposite electrode shows good electrocatalytic activity to liquid iodine/iodide electrolyte and it may be comparable to that of Pt electrode. Further, the lower peak-to-peak potential separation value and lower RCT value of Ni3S4/CoS2 electrode resulted from the electrochemical impedance spectroscopy measurement also insist on the better electrocatalytic property of the Ni3S4/CoS2 mixed-phase electrode. Consequently, DSSCs fabricated with Ni3S4/CoS2 mixed-phase heterogeneous nanocomposite counter electrode (CE) showed higher PCE value of 7.9% with open-circuit voltage (VOC) of 836 mV, and short-circuit current (JSC) of 16.1 mA/cm2 compared to Pt, which showed PCE of 6.3% with VOC of 805 mV and JSC of 16.7 mA/cm2. Overall, this study highlights the superior electrocatalytic activity of the mixed-phase Ni3S4/CoS2 CE for Pt-free DSSCs.

Ni3S4/CoS2 mixed-phase nanocomposite as counter electrode for Pt-free dye-sensitized solar cells

Landi G.;
2020

Abstract

Ni3S4/CoS2 mixed-phase heterogeneous nanocomposite was synthesized by the one-step hydrothermal route and used as the counter electrode material in Pt-free dye-sensitized solar cells (DSSC). The various analytical tools used to characterize the sample illustrate the formation of mixed phases of Ni3S4/CoS2. The cyclic voltammetry result of Ni3S4/CoS2 mixed-phase heterogeneous nanocomposite electrode shows good electrocatalytic activity to liquid iodine/iodide electrolyte and it may be comparable to that of Pt electrode. Further, the lower peak-to-peak potential separation value and lower RCT value of Ni3S4/CoS2 electrode resulted from the electrochemical impedance spectroscopy measurement also insist on the better electrocatalytic property of the Ni3S4/CoS2 mixed-phase electrode. Consequently, DSSCs fabricated with Ni3S4/CoS2 mixed-phase heterogeneous nanocomposite counter electrode (CE) showed higher PCE value of 7.9% with open-circuit voltage (VOC) of 836 mV, and short-circuit current (JSC) of 16.1 mA/cm2 compared to Pt, which showed PCE of 6.3% with VOC of 805 mV and JSC of 16.7 mA/cm2. Overall, this study highlights the superior electrocatalytic activity of the mixed-phase Ni3S4/CoS2 CE for Pt-free DSSCs.
Counter electrodes
Dye-sensitized solar cells
Efficiency of DSSCs
Nanocomposites
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12079/56225
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