Study On Photocatalytic And Lithium Storaged Performances Of N Doped TiO₂/C

TiO2 has the advantages of low cost,stablity in structure,high working voltage,excellent photocatalytic activity and non-toxicity,and has been widely concerned and used in the fields of photocatalysis and electrode materials.As photocatalyst,TiO2 has wide band gap and fast recombination rates of carriers and can only absorb ultraviolet light,resulting in a narrow light response range.As the anode material of lithium ion battery,TiO2 shows poor energy storage capacity and poor cycling stability partly due to its low conductivity.In order to improve the conductivity and the photocatalytic and electrochemical properties of TiO2.TiO2/C materials with different amount of N doping were prepared by the sol-gel method combining with ice template and SiO2 hard template and their structure,morphology and properties of photocatalytic methylene blue decomposition and photocatalytic decomposition of aquatic hydrogen as well as the lithium storaged performances as the anode of lithium ion battery were studied.In the process of the experiments by using four isopropyl titanate and sucrose as raw materials,and urea as nitrogen source,TiO2/C materials with different amount of N doping were prepared under the sintering temperature of 900℃.Raman,SEM,TEM,XPS and BET were used to characterize the structure and morphology of the prepared materials.The prepared materials have the hierarchical porous structure and high specific surface area.N was successfully doped into the lattice of TiO2 and carbon.The content of N affects the structure,morphology and properties of the N-doped TiO2/C.Undoped TiO2/C and P25 were as control samples.The properties and performances of photocatalytic degradation of methylene blue,photocatalytic hydrogenation,Mott-schottky curve,cycling stability and rate capabilities in Li-ion batteries of the N-doped TiO2/C were studied.Both the photocatalytic and electrochemical properties of N-doped TiO2/C materials reach maximiums at 3%N doping.The proper N doping enables the N-doped TiO2/C materials to pocess suitable hierarchical porous structure and,produce an intermediate state energy level near the valence band,and improve the conductivity and surface properties,leading improvement in the photocatalytic and electrochemical properties of the materials.