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-  2018 

Pt纳米颗粒负载SrTiO3/TiO2异质结结构制备及制氢性能

DOI: 10.11951/j.issn.1005-0299.20170071

Keywords: 钛酸锶,二氧化钛,水热法,异质结,光解水
SrTiO3
,TiO2,hydrothermal,method,heterojunction,photocatalytic,water,splitting

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Abstract:

本文以固定n(Sr)/n(Ti)摩尔比0.4的SrTiO3/TiO2(金红石相)异质结纳米颗粒,通过“光催化还原沉积方法”制备不同质量分数的纳米铂颗粒(0、1%、2%、5%),探究其催化活性的变化,采用XRD、SEM、UV-vis、XPS方法对其进行表征,并做了相关光催化分解水产氢性能测试.结果表明:负载贵金属Pt纳米颗粒量越大,对应的Pt晶粒平均尺寸为40.8 nm,1%Pt纳米颗粒SrTiO3/TiO2异质结构的BET比表面积在23.195 m2/g处最高,并且介孔材料的特征是平均Barrett-Joyner-Halenda(BJH)孔径为13.60 nm,总孔体积为0.079 cm3/g;高BET表面积和大的总孔体积强烈地支持SrTiO3/TiO2具有介孔结构的事实;相应的催化剂催化活性越高,其中负载5%Pt纳米颗粒的SrTiO3/TiO2纳米颗粒光催化8 h产氢量为3.574 mmol,平均产氢效率为0.447 mmol/(gcat·h),但从性价比的角度来考虑,其催化效率远不及负载1%Pt纳米颗粒的SrTiO3/TiO2纳米颗粒催化效率的5倍,因此负载5%Pt的SrTiO3/TiO2纳米颗粒光催化效率最高.
In this paper, we prepared heterojunction structure of SrTiO3/TiO2 (Rutile phase) at the mole ratio of Sr/Ti=0.4 nano-Pt loaded with different amounts of Pt (0, 1%, 2%, and 5%) and evaluated their photocatalytic performance for water splitting. The samples were characterized by XRD, TEM, UV-vis, XPS and related photocatalytic hydrogen production performance testing. The results indicated that the activity of the catalyst increased as the amount of Pt loaded increased. When the amount of Pt was 5%, the photocatalytic performance was the highest. The BET specific surface area of 1% Pt nanoparticles SrTiO3/TiO2 heterogeneous structure is the highest at 23.195 m2/g. The mesoporous material is characterized by an average Barrett-Joyner-Halenda (BJH) pore size of 13.60 nm, and total pore volume of 0.079 cm3/g. The large BET surface area and the large total pore volume strongly support the fact that SrTiO3/TiO2 has a mesoporous structure. The photocatalytic H2 evolve amount was 3.574 mmol after 8 h under the ultraviolet radiation and the average H2 evolvation rate was 0.447 mmol/(gcat·h). Although the photocatalytic performance for the nanoparticles loaded with 5% Pt was the highest efficiency, the cost performance was the lowest in contrast with the nanoparticles loaded with 1% Pt.

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