塔菲尔方程
煅烧
材料科学
金红石
电催化剂
电解
化学工程
兴奋剂
分析化学(期刊)
催化作用
电化学
化学
电极
色谱法
物理化学
有机化学
电解质
工程类
光电子学
作者
Jae Ek Son,Jayeeta Chattopadhyay,Daewon Pak
标识
DOI:10.1016/j.ijhydene.2009.10.096
摘要
Barium doped titania hollow sphere catalysts of various compositions were prepared and their electrocatalytic performance was evaluated in acidic media. Titania hollow sphere particles were prepared using poly (styrene–methacrylic acid) latex as template material, and BaCl2 was used precursor material during barium doping over spheres. The morphology and structure of Ba/TiO2 hollow spheres were characterized by BET, XRD, TGA and TEM analysis. XRD results had confirmed the presence of rutile TiO2 and BaTiO3 phases in the catalysts. The catalysts have shown almost similar surface area values (around 97 m2/g) irrespective of their compositions. On the other hand, surface area values were diminished remarkably with rise in the calcination temperatures. In TEM images, hollow sphere formation with uniform layer of barium over the spheres could clearly be observed. Diameter of Ba-doped TiO2 hollow sphere was found 0.4–0.5 μm irrespective of the variation in calcination temperatures. In cyclic voltammograms, both the hydrogen and oxygen evolution peaks were present for all the hollow sphere samples; although the peak positions had changed to some extent for few samples. Anodic polarization curves have shown 60 mA cm−2 current density for 20 wt% Ba/TiO2 hollow sphere sample. Tafel slope is revealed as 122 mV for the same electrocatalyst. Barium doped titania hollow spheres have also shown long time electrocatalytic stability in acid solution.
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