Modification of MIL-125(Ti) by Incorporating Various Transition Metal Oxide Nanoparticles for Enhanced Photocurrent during Hydrogen and Oxygen Evolution Reactions

摘要

abstract_textpHighly efficient photocatalysts of the type MxOy@MIL-125(Ti) (MxOy= MnO2, Fe2O3, Co3O4, NiO and CuO) have been prepared by in-situ incorporation of pre synthesized metal oxide nanoparticles into MIL-125(Ti) through hydrothermal method. The synthesized samples have been characterized by Powder X-ray diffraction, Raman spectroscopy, Scanning Electron Microscopy, Energy Dispersive X-ray Spectrometry, Elemental Mapping, UV-Vis spectrophotometry andN(2)-adsorption Isotherm. The photoelectrochemical properties for oxygen evolution reaction and hydrogen evolution reaction have been studied by Cyclic voltammetry and Linear sweep voltammetry analysis in 2 M aq. KOH electrolyte and stability for constant current generation of these samples is observed by Chronoamperometric measurements. These studies indicate that metal oxide nanoparticles have been successfully incorporated into MIL-125(Ti), which enhance the efficient absorption of visible light and improve the oxygen evolution and hydrogen evolution reaction activity during water splitting. Furthermore, from linear sweep voltammetry results at 1mVs(-1) scan rate it is observed that MxOy@MIL-125(Ti) samples have lower onset potential and higher current density as compared to pure MIL-125(Ti). CuO@MIL-125(Ti)/NF exhibited highest current density, lowest onset potential and better oxygen evolution reaction and hydrogen evolution reaction activity as compared to all other synthesized samples./p/abstract_text