Construction Of Indium-based/Tungsten-based Inorganic Oxides (In₂O₃, WO₃) And Study On Their Photoelectrocatalytic Performanc

Excessive exploitation of fossil fuels not only leads to the depletion of traditional energy,but also causes some water pollution,which seriously threatens the health and survival of human beings and restricts the development of economic society.Therefore,there is an urgent need to develop green,clean and renewable new energy sources and to deal with water pollution.Electrocatalytic hydrogen evolution and photocatalytic oxidation technology is an important strategy to solve the above problems at present,and the search for high efficiency and energy saving catalyst is the key factor to realize this technology.This paper mainly includes the following research contents:1.A monodisperse In₂O₃@ZIF-8 core-shell nanocomposite（CSNCs）was prepared by a simple ultrasonic chemical synthesis route.It has been found that the optical response of CSNCs can be greatly extended to the visible region by enclosing In₂O₃ nanoparticles in the ZIF-8 shell.In₂O₃@ZIF-8-175 The large surface area of CSNCs,the porous nanostructure and the synergistic effect of In₂O₃ and ZIF-8 make CSNCS exhibit excellent selectivity and ultra-high photocatalytic activity for the degradation of the organic dye acid fuchsin（AF）.The degradation rate of acid fuchsin reached 98.9%after 40 min irradiation by 150 W xenon lamp.In addition,In₂O₃@ZIF-8-175 CSNCs also showed good stability and repeatability,and the photodegradation rate of AF solution decreased slightly to 96.4%after 5 cycles of experiments.2.Se-doped WO₃·0.5H₂O nanosheet was successfully grown on g-C₃N₄substrate by a simple one-pot method to obtain Se-doped g-C₃N₄/WO₃·0.5H₂O catalyst（Se/WCN）.A The results show that,compared with the original WO₃and g-C₃N₄,the Se/WCN composite catalyst shows higher electrocatalytic activity.When the current density reaches 10 m A·cm^-2,the initial voltage is-0.75 V,and the current density reaches 70 m A·cm^-2.After exposure to light,the catalytic performance of Se/WCN was further improved,the initial potential decreased from-0.75 V to-0.65 V,and the R_ct value decreased from 371.4Ωto 310.0Ω.The photocatalytic performance of g-C₃N₄ was further enhanced by ion doping,morphology regulation,heterojunction and photoassisted methods.3.WO_3-x with regular morphology was successfully prepared by a simple solvothermal method using tungsten hexachloride and acetone as precursors,and photocatalytic tests were conducted on WO_3-x.The results show that the nano-monoclinic WO_3-x catalyst exhibits high electrocatalytic activity,and the overpotential is only-0.52 V when the current density reaches 10 m A·cm^-2.After exposure to light,the catalytic performance of nano-monochromatic WO_3-x was further improved,the overpotential decreased from-0.52 V to-0.45 V,and the R_ctvalue decreased from 200.3Ωto 120.7Ω.In addition,nano WO_3-x prepared in this paper still has high electrocatalytic activity after 90 days of placement,which provides a broad prospect for the application of metal oxide WO_3-x in hydrogen evolution.