Cathodic Electrodeposition and Characterization of ni3se2 thin Films

Abstract

Nickel selenide thin films have been potentiostatically electrodeposited on titanium substrate at room temperature from aqueous solution containing Ni-EDTA and Na 2 SeO 3 . Various deposition potentials were attempted in order to determine the optimum electrodeposition potential. The films were characterised using x-ray diffraction analysis (XRD) and the photoactivity of the electrosynthesised films were studied using linear sweep voltammetry (LSV). The band-gap energy was determined using UV-visible spectroscopy. The XRD analysis indicated the formation of polycrystalline Ni 3 Se 2 . The film exhibited p-type semiconductor behaviour with good photosensitivity. The bandgap energy (E g ) was about 1.4eV.

The effect of structural dimensionality on the electrocatalytic properties of the nickel selenide phase

“…28 Analogous to hydrogenases, FeS 2 and NiS 2 -based materials have also been reported as good HER catalysts. 57 The low dimensionality of nanostructures lead to superior physicochemical properties as compared to their bulk counter parts. 25,[31][32][33][34][35][36][37][38] Analogues nickel sulfides such as NiS, NiS 2 , Ni 3 S 2 and Ni 3 S 4 phases have been studied as well.…”

“…The Ni 3 Se 2 phase has been reported for photocatalytic water splitting, though the activity is relatively moderate. 57 The low dimensionality of nanostructures lead to superior physicochemical properties as compared to their bulk counter parts. [58][59][60] As for the NiSe phase, Yu et al 61 have reported the preparation of sea-urchin morphology-like nanostructures by the hydrothermal method and have further studied their photoluminescence properties.…”

Transition-Metal Oxides for Kesterite Solar Cells Developed on Transparent Substrates

“…However, the selenization process is also observed to affect negatively the optical transmittance of some of the oxides in the visible and, specially, in the IR regions (Figure S1 and Table S1). NiO, Co 3 O 4 , and MoO 3 exhibit the most degraded transmittances, which can be attributed to the formation of narrow-band-gap selenide compounds like Ni 3 Se 2 ( E g ∼ 1.4 eV), CoSe ( E g ∼ 1.5 eV), and MoSe 2 ( E g ∼ 1.1 eV). Oppositely, V 2 O 5 , CuO, and TiO 2 show improvement or almost no degradation after annealing.…”