Optimization of tribocatalytic performance by modifying the concentration of oxygen vacancies in KSr2Nb4TaO15 ceramics

IF 1.8 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS International Journal of Applied Ceramic Technology Pub Date : 2024-09-19 DOI:10.1111/ijac.14912

Shirong Lin, Yingzhi Meng, Changbing Pan, Zhi Yuan, Luanhai Ou, Shanjun Ke, Changzheng Hu, Xiuyun Lei, Laijun Liu

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Abstract

In recent years, catalytic degradation driven by mechanical-energy tribocatalysis has gained much attention. Point defects play very important on the catalytic activity of ferroelectric oxides. In this study, we focus on the influence of oxygen vacancies on the catalyst performance of ferroelectric oxide KSr₂Nb₄TaO₁₅ (KSNT) with a tetragonal tungsten bronze structure. The concentration of oxygen vacancies is modified by sintering atmosphere. The KSNT sintered in N₂ atmosphere exhibits the best tribocatalytic degradation efficiency of 96.7% within 2 h for degradation rhodamine B due to high concentration of oxygen vacancies. The excellent degradation efficiency is attributed to the defect energy level of KSNT and high electron–hole separation efficiency. This work reveals the relationship between oxygen vacancies and tribocatalysis efficiency, which is helpful to design and modify the new ferroelectric oxides for tribocatalysis.

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通过改变KSr2Nb4TaO15陶瓷中氧空位浓度来优化摩擦催化性能

近年来，机械能摩擦催化驱动的催化降解受到了广泛的关注。点缺陷对铁电氧化物的催化活性有重要影响。在本研究中，我们重点研究了氧空位对具有四方钨青铜结构的铁电氧化物KSr2Nb4TaO15 （KSNT）催化剂性能的影响。烧结气氛可以改变氧空位的浓度。在N2气氛下烧结的KSNT对罗丹明B的摩擦催化降解效率最高，在2 h内达到96.7%。优异的降解效率主要归功于KSNT的缺陷能级和较高的电子-空穴分离效率。本研究揭示了氧空位与摩擦催化效率之间的关系，有助于设计和修饰新型铁电氧化物用于摩擦催化。

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来源期刊

International Journal of Applied Ceramic Technology 工程技术-材料科学：硅酸盐

CiteScore

3.90

自引率

9.50%

发文量

280

审稿时长

4.5 months

期刊介绍： The International Journal of Applied Ceramic Technology publishes cutting edge applied research and development work focused on commercialization of engineered ceramics, products and processes. The publication also explores the barriers to commercialization, design and testing, environmental health issues, international standardization activities, databases, and cost models. Designed to get high quality information to end-users quickly, the peer process is led by an editorial board of experts from industry, government, and universities. Each issue focuses on a high-interest, high-impact topic plus includes a range of papers detailing applications of ceramics. Papers on all aspects of applied ceramics are welcome including those in the following areas: Nanotechnology applications; Ceramic Armor; Ceramic and Technology for Energy Applications (e.g., Fuel Cells, Batteries, Solar, Thermoelectric, and HT Superconductors); Ceramic Matrix Composites; Functional Materials; Thermal and Environmental Barrier Coatings; Bioceramic Applications; Green Manufacturing; Ceramic Processing; Glass Technology; Fiber optics; Ceramics in Environmental Applications; Ceramics in Electronic, Photonic and Magnetic Applications;