Improvement of the Selectivity for Hydrogen Peroxide Production via the Synergy of TiO2 and Graphene

To replace the four-electron transferred pathway of oxygen reduction reaction（ORR） by twoelectron transferred pathway of ORR（2e-ORR） is desirable for the production of hydrogen peroxide with addedvalue. The development of electrocatalysts with high selectivity toward 2e-ORR is of great interest but it is still a challenge. Here, we synthesized the graphene-supported titanium dioxide nanocomposite as the 2e-ORR catalysts by a combinative process of hydrothermal methods and calcination. Due to the...     

Local structure and optical absorption characteristic investigation on Fe doped TiO2 nanoparticles

The local structures and optical absorption characteristics of Fe doped Ti O2 nanoparticles synthesized by the sol-gel method were characterized by X-ray diffraction(XRD), X-ray absorption fine structure spectroscopy(XAFS) and ultraviolet-visible absorption spectroscopy(UV-Vis). XRD patterns show that all Fe-doped Ti O2 samples have the characteristic anatase structure. Accurate Fe and Ti K-edge EXAFS analysis further reveal that all Fe atoms replace Ti atoms in the anatase lattice. The analysis of UV-Vis data shows a red shift to the visible range. According to the above results, we claim that substitutional Fe atoms lead to the formation of structural defects and new intermediate energy levels appear, narrowing the band gap and extending the optical absorption edge towards the visible region.