浓度诱导CuFeTiHfZrO高熵氧化物形貌演变及性能优化

Concentration-Driven Morphological Evolution and Performance Optimization in CuFeTiHfZrO High-Entropy Oxides

摘要: 高熵氧化物作为由多种金属元素共同构成的无序固溶体体系，显著的晶格畸变效应与多组元协同作用赋予了其高催化活性，在电化学催化及光降解等领域应用前景广泛。然而，高熵材料的结构及缺陷分布对其表面的催化反应行为有重要影响。本文采用超声辅助共沉淀法构建了CuFeTiHfZr五元高熵氧化物，通过调节前驱体浓度实现对材料形貌结构的调控，成功制备出具有小片层、类花状、纳米颗粒等结构的高熵氧化物。以亚甲基蓝为模型污染物，具有类花状形貌结构的样品表现出最优的降解性能，在4 h内降解效率达到约90%。本研究为多组元氧化物的结构调控与性能优化提供了新思路，也为有机染料降解技术的实际应用提供了重要参考。

Abstract: As a disordered solid solution system composed of a variety of metal elements, high-entropy oxides have high catalytic activity due to the remarkable lattice distortion effect and the synergistic effect of multiple components, and have broad application prospects in electrochemical catalysis and photodegradation. However, the structure and defect distribution of high entropy materials have an important influence on the catalytic reaction behavior of their surfaces. In this paper, the five-element high-entropy oxide of CuFeTiHfZr was constructed by ultrasonic-assisted coprecipitation method, and the morphology and structure of the material were controlled by adjusting the concentration of precursors, and the high-entropy oxide with platelet-like, flower-like and nano-particle structures was successfully prepared. Taking methylene blue as a model pollutant, the sample with flower-like morphology showed the best degradation performance, and the degradation efficiency reached about 90% within 4 h. This study provides a new idea for the structural regulation and performance optimization of multicomponent oxides, and also provides an important reference for the practical application of organic dye degradation technology.