▎ 摘　　要

In this study, Gd and Fe doped La1-xGdxNi1-yFeyO3 NPs were synthesized by co-precipitation and their nano composites (NCs) with reduced graphene oxide (r-GO) were fabricated by ultra-sonication approach. The as fabricated La1-xGdxNi1-yFeyO3/r-GO was characterized by Raman scattering, thermogravimetric analysis (TGA) and X-ray diffraction (XRD), scanning Electron Microscopy (SEM), Energy Dispersive X-Ray (EDX), Brunauer-Emmett-Teller (BET) techniques along with electrical conductivity and photocatalytic studies. Analysis revealed that the NPs had distorted rhombohedral geometry and their crystallite size was in the range of 19-27 nm. The surface area of La1-xGdxNi1-yFeyO3/r-GO NCs increased from 67 to 153 m(2)/g by doping and adding r-GO. Two probe current-voltage (I-V) analysis shows the electrical conductivity of the material improved from 5.2 x 10(-2) S/m to 4.8 x 10(5) S/m by doping and adding r-GO. The photocatalytic performance of LaNiO3, La1-xGdxNi1-yFeyO3/r-GO NPs and La1-xGdxNi1-yFeyO3/r-GO/r-GO NCs was evaluated by degrading methyl green (MG) dye under solar light irradiation. Results revealed that the LaNiO3 and La1-xGdxNi1-yFeyO3 NPs degraded up to 38.1% and 62.3% MG dye under solar irradiation for 70 min. It was observed that La1-xGdxNi1-yFeyO3/r-GO NCs furnished 93.8% higher MG dye compared to LaNiO3, La1-xGdxNi1-yFeyO3/r-GO NCs had excellent degradation efficiency due to the combined effect of doping Gd and Fe and adding r-GO. This was due to the defect in the structure of La1-xGdxNi1-yFeyO3/r-GO, which inhibited the recombination of charge carrier species. NCs with excellent electrical conductivity and photocatalytic activity could have potential applications as a photocatalyst under solar light irradiation.