Xiao Hongyuan, Dong Wen, Zhao Qi, Wang Feifei, Guo Yiping
State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering Shanghai Jiao Tong University, Shanghai 200240, China.
School of Optical and Electronic Information and Engineering Research Centre for Functional Ceramics of the Ministry of Education Huazhong University of Science and Technology, Wuhan 430074, China.
J Hazard Mater. 2021 Aug 15;416:125808. doi: 10.1016/j.jhazmat.2021.125808. Epub 2021 Apr 6.
The band structure of ferroelectrics can be modulated by mechanical stress induced piezoelectric polarization charges, and thus to promote the separation of photo-excited carriers, endowing photo-piezocatalysts with good performance in hydrogen production and pollutants degradation. However, the catalytic performance of these conventional photo-piezocatalysts is restricted since they mainly harvest UV light and generally have limited piezoelectricity. Here, in this study, by using self-propagation high-temperature synthesis process, highly piezoelectric gap-state-engineered nano relaxor ferroelectric at the morphotropic phase boundary, such as (NaBi)TiO-Ba(TiNi)O is synthesized for the first time and shows unprecedently light harvesting from UV to near-infrared (λ < 1300 nm). We demonstrate a significantly enhanced photo-piezocatalytic performance for this photo-piezocatalyst. A high hydrogen production rate of ~ 450 μmol g h is obtained and the decomposition of Rhodamine B dye is nearly completed after 20 min under irradiation and ultrasonic vibration. Moreover, an unprecedently efficient NIR-driven photocatalytic degradation of RhB is also demonstrated by using photo-piezocatalysts. This kind of novel multifunctional nano photo-piezocatalysts opens up new horizons to all-day available photo-piezocatalytic technology for a more efficient use of multisource energies from environment.
铁电体的能带结构可通过机械应力诱导的压电极化电荷进行调制，从而促进光激发载流子的分离，使光压电催化剂在制氢和污染物降解方面具有良好性能。然而，这些传统光压电催化剂的催化性能受到限制，因为它们主要吸收紫外光且通常压电性有限。在此研究中，通过自蔓延高温合成工艺，首次合成了在准同型相界处具有高压电性的间隙态工程化纳米弛豫铁电体，如(NaBi)TiO-Ba(TiNi)O，其展现出前所未有的从紫外光到近红外光（λ < 1300 nm）的光捕获能力。我们证明了这种光压电催化剂的光压电催化性能显著增强。在光照和超声振动下，该催化剂的产氢速率高达约450 μmol g h，且20分钟后罗丹明B染料几乎完全分解。此外，利用光压电催化剂还展示了前所未有的高效近红外驱动的罗丹明B光催化降解。这种新型多功能纳米光压电催化剂为全天候可用的光压电催化技术开辟了新视野，以便更有效地利用来自环境的多源能量。
