Abstract:
In this study, we synthesized a ternary transition metal sulfide, Zn0.76Co0.24S (ZCS-CE),
using a one-step solvothermal method and explored its potential as a Pt-free counter electrode for
dye-sensitized solar cells (DSSCs). Comprehensive investigations were conducted to characterize the
structural, morphological, compositional, and electronic properties of the ZCS-CE electrode. These
analyses utilized a range of techniques, including X-ray diffraction, scanning electron microscopy,
energy dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. The electrocatalytic
performance of ZCS-CE for the reduction of I3
− species in a symmetrical cell configuration was
evaluated through electrochemical impedance spectroscopy and cyclic voltammetry. Our findings
reveal that ZCS-CE displayed superior electrocatalytic activity and stability when compared to platinum in I−/I3
− electrolyte systems. Furthermore, ZCS-CE-based DSSCs achieved power conversion
efficiencies on par with their Pt-based counterparts. Additionally, we expanded the applicability of
this material by successfully powering an electrochromic cell with ZCS-CE-based DSSCs. This work
underscores the versatility of ZCS-CE and establishes it as an economically viable and environmentally friendly alternative to Pt-based counter electrodes in DSSCs and other applications requiring
outstanding electrocatalytic performance.
