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Preparation of CoS2 counter electrode on Ni sheet for QDSSCs via electrophoretic deposition of ZIF-67

Preparing counter electrode (CE) with low cost and high catalytic activity is a method for improving the photovoltaic performance of quantum dot-sensitized solar cells (QDSSCs). Here, ZIF-67 thin films are prepared on an Ni sheet and FTO-conducting glass substrate by electrophoretic deposition at different applied electric fields, and then efficient CoS2/Ni and CoS2/FTO electrodes are obtained by vulcanizing the ZIF-67 thin films using thioacetamide. The prepared CoS2 thin films are characterized by the measurements of the scanning electron microscope, x-ray photoelectron spectroscopy, x-ray powder diffraction and Fourier transform infrared spectra. Further, the CoS2/Ni and CoS2/FTO thin films are used as CEs to fabricate QDSSCs. Photocurrent-voltage curves, electrochemical impedance spectroscopies and Tafel curves are measured to evaluate their photoelectrochemical properties. The short-circuit photocurrent value of QDSSC, based on the CoS2/Ni CE, is significantly improved compared with that of the cell based on the CoS2/FTO, and thus the light-to-electric conversion efficiency increases from 1.95% to 3.24%. The enhancement mechanism of electrocatalytic activity and photovoltaic performance of CE prepared on an Ni sheet are analyzed to be less resistant than an Ni sheet and have a higher charge transfer rate between CE and electrolyte.