A coral-like film of Ni@NiS with core-shell particles for the counter electrode of an efficient dye-sensitized solar cell
Journal
Journal of Materials Chemistry A
Journal Volume
2
Journal Issue
16
Pages
5816-5824
Date Issued
2014
Author(s)
Abstract
A coral-like film of nickel@nickel sulfide (Ni@NiS) was obtained on a conducting glass through an electrochemical method, in which the Ni functioned as a template. Three types of Ni thin films were electrodeposited on fluorine-doped tin oxide (FTO) substrates by a pulse current technique at the passed charge densities of 100, 200, and 300 mC cm-2, which rendered custard apple-like, coral-like, and cracked nanostructures, respectively. Subsequently, nickel sulfide films were coated on these Ni films by using a pulse potential technique. Due to the template effect of the Ni films, the composite films of Ni@NiS also assumed the same structures as those of their nickel templates. In each case of the films the particle of the film assumed a core-shell structure. The Ni@NiS coated FTO glasses were used as the counter electrodes for dye-sensitized solar cells (DSSCs). The DSSC with the coral-like Ni@NiS film on its counter electrode exhibits the highest power conversion efficiency (η) of 7.84%, while the DSSC with platinum film on its counter electrode shows an η of 8.11%. The coral-like Ni@NiS film exhibits multiple functions, i.e., large surface area, high conductivity, and great electrocatalytic ability for iodine/triiodine (I-/I3 -) reduction. X-ray photoelectron spectroscopy (XPS), X-ray diffraction pattern (XRD), scanning electron microscopy (SEM), and four-point probe technique were used to characterize the films. The photovoltaic parameters are substantiated using incident photon-to-current conversion efficiency (IPCE) curves, cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization plots. The IPCE curves were further used to calculate theoretical short-current densities of the cells. © the Partner Organisations 2014.
SDGs
Other Subjects
Composite films; Conversion efficiency; Cyclic voltammetry; Electrochemical impedance spectroscopy; Glass; Nanocomposites; Photoelectrochemical cells; Photoelectrons; Scanning electron microscopy; Solar cells; X ray diffraction; X ray photoelectron spectroscopy; Dye-Sensitized solar cell; Dye-sensitized solar cells; Electrocatalytic ability; ELectrochemical methods; Fluorine doped tin oxide (FTO); Four-point probe techniques; Incident photon-to-current conversion efficiencies; Power conversion efficiencies; Nickel
Type
journal article