Oxygen Vacancies Driven Preparation of AuPd/WOx Composites and Their Catalytic Performance
WOx with oxygen vacancies has been synthesized by the hydrothermal method,and Au/WOx,Pd/WOx and AuPd/WOx composite catalytic materials are synthesized by using oxygen vacancies as driving force under reflux condition,while no additional reducing agents or surfactants are required in the process.The materials prepared are characterized using X-ray diffraction,electron paramagnetic resonance spectrometer(EPR),Fourier transform infrared spectroscopy,field emission scanning electron microscope,Brunauer-Emmett-Teller(BET),transmission electron microscope,etc.The determination of EPR signal confirm the presence of oxygen vacancies in the WOx catalytic material,with a corresponding g value of 2.003.And the surface of the WOx nanosheets achieves uniform loading of precious metals.Additionally,the prepared WOx,Pd/WOx,Au/WOx,and AuPd/WOx catalytic materials are used for catalyzing hydrogen production from formic acid(achieving a hydrogen yield of 22.7 mL in 10 h)and the reduction of nitrophenol(achieving a conversion rate of 99%in 60 s).Among these materials,it can be found that AuPd/WOx composite shows the best catalytic activity.These results indicate that Au,Pd and AuPd alloys could regulate the electronic structure of WOx,improving the catalytic activity of catalyzing formic acid to produce hydrogen and reduce p-nitrophenol to varying degrees,which provides a reference for applications of the precious metal WOx composites in hydrogen energy and water treatment.
AuPd/WOxcatalytic reductionhydrogen production from formic acidreduction of p-nitrophenol
万方数据
