<br>具有增强光压电催化活性的单晶铁电基 (K,Na)NbO3 微立方体/CuO 纳米点异质结构,Small

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具有增强光压电催化活性的单晶铁电基 (K,Na)NbO3 微立方体/CuO 纳米点异质结构
Small ( IF 13.0 ) Pub Date : 2023-08-30 , DOI: 10.1002/smll.202304360
Eunmi Im ₁ , Seonhwa Park ₂ , Geon-Tae Hwang ₃ , Dong Choon Hyun ₄ , Yuho Min ₂ , Geon Dae Moon ₁

Affiliation

开发具有高性能光压电催化活性的单晶异质结构铁电体非常需要利用大的压电势和更多的反应性电荷来触发所需的氧化还原反应。为此，采用一种简单的策略制备了一种具有增强光压电催化活性的单晶基 (K,Na)NbO ₃ (KNN) 微立方体/CuO 纳米点异质结构，该策略利用了异质结形成和强单晶之间的协同作用本文报道了基于压电效应的。在光照射、超声处理或两种刺激的共激发下研究了 KNN/CuO 的催化罗丹明 B 降解活性。与多晶KNN粉末和裸KNN单晶相比，单晶基KNN/CuO表现出更高的压电电流密度和最佳的能带结构，压电催化降解活性分别提高了5.23倍和2.37倍。此外，KNN/CuO在25分钟超声处理和光照射下的最大光压电催化速率常数（≈0.093 min ^-1 ）优于其他KNN基催化剂，比单独的压电催化和光催化反应高1.6和48.6倍分别为速率常数。优异的光压电催化活性归因于通过适当的p-n异质结和高压电势增强的电荷载流子分离以及能带结构与所需氧化还原水平的正确排列。该报告提供了关于异质结、压电响应和单晶异质结构催化剂催化机制之间关系的有用见解。

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Single-Crystal Ferroelectric-Based (K,Na)NbO3 Microcuboid/CuO Nanodot Heterostructures with Enhanced Photo–Piezocatalytic Activity

Developing single-crystal-based heterostructured ferroelectrics with high-performance photo–piezocatalytic activity is highly desirable to utilize large piezopotentials and more reactive charges that can trigger the desired redox reactions. To that end, a single-crystal-based (K,Na)NbO₃ (KNN) microcuboid/CuO nanodot heterostructure with enhanced photo–piezocataytic activity, prepared using a facile strategy that leveraged the synergy between heterojunction formation and an intense single-crystal-based piezoelectric effect, is reported herein. The catalytic rhodamine B degrading activity of KNN/CuO is investigated under light irradiation, ultrasonication, or co-excitation with both stimulations. Compared to polycrystalline KNN powders and bare KNN single-crystals, single-crystal-based KNN/CuO exhibits a higher piezocurrent density and an optimal energy band structure, resulting in 5.23 and 2.37 times higher piezocatalytic degradation activities, respectively. Furthermore, the maximum photo–piezocatalytic rate constant (≈0.093 min⁻¹) of KNN/CuO under 25 min ultrasonication and light irradiation is superior to that of other KNN-based catalysts, and 1.6 and 48.6 times higher than individual piezocatalytic and photocatalytic reaction rate constants, respectively. The excellent photo–piezocatalytic activity is attributed to the enhanced charge-carrier separation and proper alignment of band structure to the required redox levels by the appropriate p–n heterojunction and high piezoelectric potential. This report provides useful insight into the relationships between heterojunctions, piezoelectric responses, and catalytic mechanisms for single-crystal-based heterostructured catalysts.

更新日期：2023-08-30

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