An Ru@TiO_(2)sandwich structure of TiO_(2)|Ru|TiO_(2)is developed via a novel synthesis method by etching two-dimensional K_(2)Ti_(2)O_(5) in a salicylic acid solution and further inserting Ru nanodots between anatase...An Ru@TiO_(2)sandwich structure of TiO_(2)|Ru|TiO_(2)is developed via a novel synthesis method by etching two-dimensional K_(2)Ti_(2)O_(5) in a salicylic acid solution and further inserting Ru nanodots between anatase TiO_(2)layers.In this sandwich structure,Ru nanodots are in close contact with anatase TiO_(2)layers and dispersed more on the edge,which promotes electron transfer and limits the aggregation of Ru nanoparticles.The orientation distribution of the Ru@TiO_(2)sandwich obtained with processing electron diffraction(PED)indicates that{002}crystal planes are dominant for Ru nanodots,which exhibit high HER activity.Applied to the hydrogen evolution reaction(HER),a 2.54 wt%Ru@TiO_(2)sandwich not only shows comparable activity to 20 wt%Pt/C but also exhibits higher current densities at low potentials.Meanwhile,the mass and price activities of Ru@TiO_(2)sandwich are 13 and 50 times,respectively,higher than those of 20 wt%Pt/C.This report provides a novel approach to designing the morphology of hetero-structured catalysts.展开更多
基金supported by the National Key R&D Program of China(Grant No.2016YFB0901600)National Science Foundation of China(Grant No.51402334 and 51502331)+1 种基金Science and Technology Commission of Shanghai(Grant No.14520722000)Key Research Program of Chinese Academy of Sciences(Grant No.KGZD-EW-T06).
文摘An Ru@TiO_(2)sandwich structure of TiO_(2)|Ru|TiO_(2)is developed via a novel synthesis method by etching two-dimensional K_(2)Ti_(2)O_(5) in a salicylic acid solution and further inserting Ru nanodots between anatase TiO_(2)layers.In this sandwich structure,Ru nanodots are in close contact with anatase TiO_(2)layers and dispersed more on the edge,which promotes electron transfer and limits the aggregation of Ru nanoparticles.The orientation distribution of the Ru@TiO_(2)sandwich obtained with processing electron diffraction(PED)indicates that{002}crystal planes are dominant for Ru nanodots,which exhibit high HER activity.Applied to the hydrogen evolution reaction(HER),a 2.54 wt%Ru@TiO_(2)sandwich not only shows comparable activity to 20 wt%Pt/C but also exhibits higher current densities at low potentials.Meanwhile,the mass and price activities of Ru@TiO_(2)sandwich are 13 and 50 times,respectively,higher than those of 20 wt%Pt/C.This report provides a novel approach to designing the morphology of hetero-structured catalysts.
