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›› 2007, Vol. 7 ›› Issue (5): 1022-1028.

• 材料工程专栏 • 上一篇    下一篇

Preparation and Photoelectrochemical Performance of Potassium Hexatitanate Nanofilm

钱清华,刘畅,胡煜艳,杨祝红,冯新,陆小华   

  1. 南京工业大学化学化工学院
  • 出版日期:2007-10-20 发布日期:2007-10-20

Preparation and Photoelectrochemical Performance of Potassium Hexatitanate Nanofilm

QIAN Qing-hua,LIU Chang,HU Yu-yan,YANG Zhu-hong,FENG Xin,LU Xiao-hua   

  1. College of Chemistry and Chemical Engineering, Nanjing University of Technology
  • Online:2007-10-20 Published:2007-10-20

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摘要： Nanostructured K2Ti6O13 film photoelectrode produced in situ was prepared on indium-tin oxide (ITO) glass substrate by a sol-gel process and characterized by thermogravimetry (TG) and differential scanning calorimetry (DSC), X-ray diffraction (XRD), atomic force microscopy (AFM), UV-Visible diffuse reflectance and Raman spectrometry. The photoelectrochemical performance of K2Ti6O13 film was assessed by electrochemical method. The analytical results showed that the K2Ti6O13 film had a strong and wide absorption in the ultraviolet and visible light range. The band gap energy (Eg) of the film shifted from 3.45 eV (bulk) to 3.05 eV (film). The flat-band potential (Efb) of K2Ti6O13 film was -0.67 V [vs. saturated calomel electrode (SCE)]. The transport of photogenerated electrons and holes was better in K2Ti6O13 film electrode than that in TiO2 film electrode. The photoelectrochemical response of K2Ti6O13 photoelectrode was increased in electrolyte solution with KOH, compared with that in the solution without KOH. The adsorption of OH- on the nanofilm acted as the surface activity center. The mechanism of photolysis was analyzed in terms of photoelectrochemical behavior.

关键词: potassium hexatitanate film, sol-gel process, atomic force microscopy, photoelectrochemical performance

Abstract: Nanostructured K2Ti6O13 film photoelectrode produced in situ was prepared on indium-tin oxide (ITO) glass substrate by a sol-gel process and characterized by thermogravimetry (TG) and differential scanning calorimetry (DSC), X-ray diffraction (XRD), atomic force microscopy (AFM), UV-Visible diffuse reflectance and Raman spectrometry. The photoelectrochemical performance of K2Ti6O13 film was assessed by electrochemical method. The analytical results showed that the K2Ti6O13 film had a strong and wide absorption in the ultraviolet and visible light range. The band gap energy (Eg) of the film shifted from 3.45 eV (bulk) to 3.05 eV (film). The flat-band potential (Efb) of K2Ti6O13 film was -0.67 V [vs. saturated calomel electrode (SCE)]. The transport of photogenerated electrons and holes was better in K2Ti6O13 film electrode than that in TiO2 film electrode. The photoelectrochemical response of K2Ti6O13 photoelectrode was increased in electrolyte solution with KOH, compared with that in the solution without KOH. The adsorption of OH- on the nanofilm acted as the surface activity center. The mechanism of photolysis was analyzed in terms of photoelectrochemical behavior.

Key words: potassium hexatitanate film, sol-gel process, atomic force microscopy, photoelectrochemical performance