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光催化技术被认为是最有前景的环境污染处理技术,这就使得光催化剂材料备受瞩目.近年来,铁电材料作为新型光催化剂材料受到人们越来越多的关注,其原因在于铁电材料特有的自发极化有望解决催化反应过程中的电子-空穴对复合问题,进而提高光催化活性.本文从两个方面对铁电极化如何影响光催化进行综述:一方面,从铁电极化入手归纳总结其对电子-空穴对分离的影响,进而更深入地从极化引发的退极化场和能带弯曲两个部分来阐述具体的影响机理;另一方面,为了消除静电屏蔽,分别从温度、应力(应变)、电场三个外场因素调控极化入手,归纳总结外场调控极化对电子-空穴对分离的影响,进而影响光催化活性.最后对该领域今后的发展前景进行了展望.
Photocatalytic technology is considered as the most promising environmental pollution treatment technology, which makes the photocatalyst material attracting much attention.In recent years, ferroelectric materials as a new type of photocatalyst material by more and more attention, the reason is that the ferroelectric The spontaneous polarization of the material is expected to solve the electron-hole pair recombination problem in the catalytic reaction process and thus enhance the photocatalytic activity.This paper reviews the photocatalytic effects of ferroelectric polarization from two aspects: on the one hand, In the beginning, the author summarizes its influence on electron-hole pair separation, and further elaborates the specific mechanism of influence from polarization-induced depolarization field and band bending. On the other hand, in order to eliminate electrostatic shielding, The effects of field-controlled polarization on the separation of electron-hole pairs are summarized and the photocatalytic activities are affected respectively by the three fields of temperature, stress (strain) and electric field.Finally, the future development of this field is carried out Looking forward.