13319

1150 دكتري

دكتري

شيمي فيزيك

اصفهان: دانشگاه صنعتي اصفهان، دانشكده شيمي

۱۳۹۶

خ، ۱۲۸ص.:‌ مصور، جدول، نمودار

يوسف غايب، محمد محسن مومني

بهزاد رضائي، حسين فرخ پور، مجيد مقدم

1396/12/12

كتابنامه

شيمي

شيمي

ID1150 دكتري

129 Synthesis characterization and investigation of photocatalytic and photostability properties of rGO Cu2O CNT Cu2O and CuWO4 Cu2O nanocomposites for photoelectrochemical water splitting Majid Menati m menati@ch iut ac ir Department of chemistryDepartment of chemistry Isfahan University of Technology 84156 83111 Isfahan IranDr Yosef Ghayeb y ghayeb@cc iut ac irDr M M Momeni mm momeni@cc iut ac irAbstractIn this project in order to improve photoelectrochemical activity of Cu 2O in the photoelectrochemical PEC water splitting reaction for hydrogen production we synthesized Cu 2O nanocomposites with graphene rGO Cu2O CNT CNT Cu2O and CuWO4 CuWO4 Cu2O For the synthesis of bare Cu2O and relatednanocomposites Wet chemical oxidation method was applied In this method an 50 ml alkaline solutioncontaining KOH 1M and NH4 2S2O8 0 035M as oxidant agent was prepared and then pure copper foilswere placed into the solution After oxidation of copper foil a blue layer containing micro nano structures ofCu OH 2 was formed on its surface that after thermal treatment in N 2 at os he e at 450 C fo 3h Cu2O wasachieved For preparation of rGO Cu2O and CNT Cu2O nanocomposites immersion and hydrothermalapproaches were applied In the immersion method at room temperature Cu OH 2 pieces was placed in thegraphene oxide or Functionalized carbon nanotubes followed thermal treatment For preparation withhydrothermal method graphene oxide GO solution along with as prepared Cu OH 2 Cu foil sample weretransferred into Teflon lined stainless steel autoclave for hydrothermal reaction for different duration times at120 C followed by subsequent calcination at 450 C under vacuum for 3 h in order to synthesis ofCuWO4 Cu2O nanocomposite Na2WO4 2H2Osalt was added to the oxidant solution and then Cu foil wasoxidized in that solution containing different concentrations of Na 2WO4 2H2O for 2h until micro nanostructures of CuWO4 Cu OH 2 was grown on the copper foil surface that was converted to CuWO 4 Cu2Oafter annealing under conditions similar to bare Cu2O synthesis The prepared nanocomposite then wereapplied in photoelectrochemical water splitting reaction for hydrogen generation and theirphotoelectrochemical performance was investigated by linear scanning voltammetry LSV andchronoamperometry under visible irradiation with 100 mW cm2 intensity and obtained results was comparedwith bare Cu2O The results show that photocurrent density and also photostability of Cu 2O after compositionwith graphene CNT and to CuWO4 were significantly enhanced The photocurrent density obtained for bareCu2O and was 0 8 mA cm2 at 0 6 V vs Ag AgCl and this value for the optimized samples ofrGO Cu2O immersion rGO Cu2O hydrothermal CNT Cu2O immersion CNT Cu2O hydrothermal andCuWO4 Cu2O nanocomposite was achieved to 1 8 1 4 1 8 2 and 1 8 mA cm 2 respectively Photostability ofbare Cu2O at 0 6 V vs Ag AgCl for 1000 s was 12 5 after composition of Cu 2O this value was enhancedto 72 52 38 77 and 50 for the aforementioned samples respectively Keywords Photoelectrochemical water splitting Cu2O CuWO4 CNT rGO photocurrent

يوسف غايب، محمد محسن مومني

بهزاد رضائي، حسين فرخ پور، مجيد مقدم