화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.72, 18-30, April, 2019
DOI10.1016/j.jiec.2018.12.034  Export Citation
Utilization of the internal electric field in semiconductor photocatalysis: A short review
Thangavel Sakthivel†, Gunasekaran Venugopal1, †, Arulappan Durairaj2, Samuel Vasanthkumar2, and Xiaoyong Huang†
  • Key Lab of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, PR China
  • 1Department of Materials Science, School of Technology, Central university of Tamil Nadu, Thiruvarur, Tamil Nadu 610 005, India
  • 2Department of chemistry, Karunya University, Karunya Nagar, Coimbatore 641-114, Tamil Nadu, India
E-mail:, ,
Photocatalysis denotes as an environmental friendly chemical transformation technique. The rate of photoinduced electron.hole recombination is one of the difficulties encountered in semiconductor photocatalysis.Differentalternative systems were suggested to over come this problem and thereby improve the efficiency of the photocatalyst. Extensively investigated methods were not effective to achieve the required efficiencyof the catalyst, because the cataly stcharge carrierseparation is poor. Among theexplored methods, the electron.hole separation using built-in electric field attracts considerable attention as a new concept. A spontaneous potential from the ferroelectric material strongly minimizes the number of photoinduced electron.hole recombination. On the other hand, the spontaneous potential was compensated by the external and internal charge and to alternate the electric field, thermal, mechanical and electric field were applied as an external force. The external force was exerted by different methods, including passage of ultrasound waves, fluid eddy, flowing water, mechanical distribution and changing the temperature. Preliminary work has been carried out using semiconductor-Ferroelectric nanohybrid piezophotocatalyst in environmental remediation for the removal of an organic color and non-colored pollutants. Later, the application was extended to hydrogen production from water splitting and antibacterial material development. Furthermore, the light free catalysts such as piezocatalyst, dark catalyst and vibration catalyst are also examined for last decades. In this review, we summarize the work carried out by the internal electric field induced photocatalyst electron.hole separation (Piezo photocatalyst) and temperature triggered catalyst (Pyrocatalyst). Light free or vibration catalyst (piezocatalyst) work also briefly covered in this review. Overall, themanuscript was discussed in four categories of materials,including BaTiO3, ZnO, other ABO3 structures and two-dimensional nanostructures including MoS2, WS2, MoSe2. The challenges encountered, and the present and future scope of the work is also discussed in this review.
Keywords:Piezo photocatalyst;Built-in electric field;Charge carrier separation;External force;Degradation
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