铁电自发极化转向载流子迁移以促进光催化和分子氧活化。
Ferroelectric spontaneous polarization steering charge carriers migration for promoting photocatalysis and molecular oxygen activation.
机构信息
Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China; Department of Chemistry, The Pennsylvania State University, University Park, PA 16802, United States.
Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China.
出版信息
J Colloid Interface Sci. 2018 Jan 1;509:113-122. doi: 10.1016/j.jcis.2017.09.005. Epub 2017 Sep 6.
Introducing a polarization electric field in photocatalyst system is regarded asa new concept for photocatalytic activity enhancement. In this work, we first unearth that the spontaneous polarization of ferroelectric BaTiO promotes the photocatalytic and molecular oxygen activation performance of the narrow-band-gap semiconductor BiOI. Ferroelectric tetragonal-phase BaTiO (T-BaTiO) were prepared via calcination of nonferroelectric cubic-phase BaTiO (C-BaTiO), and their polarization ability was verified via ultrasonication-assisted piezoelectric catalytic degradation. Then, the C-BaTiO/BiOI and T-BaTiO/BiOI heterostructures are fabricated by a soft-chemical method. To disclose the influence of ferroelectric spontaneous polarization on charge movement behavior, the photocatalytic and molecular oxygen activation properties are monitored by degradation of methyl orange (MO) and superoxide radical (O) evolution under visible light irradiation (λ>420nm), respectively. The results demonstrated that T-BaTiO/BiOI far outperforms C-BaTiO/BiOI and pristine BiOI. The ferroelectric spontaneous polarization of T-BaTiO can steer the migration of photogenerated charge carriers and induce efficient separation, accounting for the strengthened photodegradation and reactive oxygen species O production rate (11.02×10molLh). The study may furnish a new reference for developing efficient tactics to advance the photocatalytic and molecular oxygen activation ability for environmental chemistry and biochemistry applications.
在光催化剂系统中引入极化电场被认为是提高光催化活性的新概念。在这项工作中，我们首先发现铁电体 BaTiO 的自发极化促进了窄带隙半导体 BiOI 的光催化和分子氧活化性能。通过对非铁电体立方相 BaTiO（C-BaTiO）进行煅烧，制备了铁电四方相 BaTiO（T-BaTiO），并通过超声辅助压电催化降解验证了其极化能力。然后，通过软化学方法制备了 C-BaTiO/BiOI 和 T-BaTiO/BiOI 异质结。为了揭示铁电自发极化对电荷迁移行为的影响，分别通过在可见光照射下（λ>420nm）降解甲基橙（MO）和超氧自由基（O）的演化来监测光催化和分子氧活化性能。结果表明，T-BaTiO/BiOI 的性能远优于 C-BaTiO/BiOI 和原始 BiOI。T-BaTiO 的铁电自发极化可以引导光生载流子的迁移并诱导有效的分离，从而提高光降解和活性氧物种 O 生成速率（11.02×10molLh）。该研究可能为开发有效的策略提供新的参考，以提高环境化学和生物化学应用中的光催化和分子氧活化能力。
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