Based On P-type Semiconductor CuI,Preparation Of Composite Materials And Their Photo-electrocatalytic Properties

Nowadays,the technology of photo-electrocatalytic,as the most promising means of water treatment,has been received more and more research interests and become one of hot research topics in the field of water purification treatment.Semiconductor catalyst is the core of the photo-electrocatalytic.Cuprous iodide,as a p-type wide energy band gap?ca.3.1 eV?material,duo to advantages in Optical and electrochemical properties,has been widely used in the field of photo-electrocatalytic.However,the practical applications of CuI are still limited due to the low quantum efficiency and the high charge recombination.To enhanced photo-electrocatalytic performance of CuI,this paper,based on p-type semiconductor CuI,many novel catalysts were fabricated by coupling with other materials?such as,other semiconductors or noble metal?for achieving higher carrier mobility and reducing recombination rate,and applied in direct methanol fuel cells or organic pollutant degradation under light and dark conditions.The main research work as following:?1?A p-n heterojunction including p-type CuI and n-type TiO2 is fabricated by a simple hydrothermal method,then Pt nanoparticles were deposited on the surface of CuI/TiO₂ as cocatalysts,obtaining the Pt-CuI/TiO₂.After that,the as-prepared Pt-CuI/TiO₂ modified electrode is studied for the electrocatalytic oxidation of methanol both in dark and under light illumination conditions.The activity of the Pt-CuI/TiO2 modified electrode for electrocatalytic oxidation of methanol under light illumination is 4.0 times than counterpart in dark condition.Moreover,compare to bare CuI and TiO₂ under light illumination,the electrocatalytic activity of CuI/TiO₂ for electrocatalytic oxidation of methanol enhanced 4.3 and 9.1 times,respectively.?2?The CuI/BiOI Heterojunction were prepared by the KI,CuSO₄·5H₂O and Bi?NO₃?₃·5H₂O,using a hydrothermal method,then the CuI/BiOI acted as visible-light-activated substrate for the decoration of Pt nanoparticles.As-synthesized samples were evaluated by photoelectrocatalytic oxidation of methanol and methylene blue?MB?under visible-light irradiation.As a result,the photoelectrocatalytic activity and the stability of Pt-CuI/BiOI for photoelectrocatalytic oxidation of methanol and methylene blue?MB?under visible-light irradiationwere has been greatly improved.?3?Plasmonic photoelectroncatalyst of Au-CuI was synthesized by photo-reduction method.Then,the as-prepared Au-CuI modified electrode is studied for the electrocatalytic oxidation of ethanol and methylene blue?MB?both in dark and under light illumination.Compared to traditional ambient electrocatalytic procedure,the corresponding PEC activities of Au/CuI showed ca.5.6 and 13 times for the oxidation of ethanol and MB,respectively,under visible light irradiation.