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High-temperature thermal shock and material modification: In a review published in the International Journal of Extreme Manufacturing, the team of Professor Fei Huilong and Professor Wang Shuangyin systematically introduced the latest progress in the ultrafast synthesis of single-atom catalysts (SACs) under extreme heating conditions. These ultrafast heating strategies effectively inhibit the migration and agglomeration of metal atoms through instantaneous high temperature and rapid cooling, significantly improving the dispersion and loading of metals. Flash Joule Heating Machine (FJH) technology can also quickly heat materials to high temperatures, triggering the reorganization of the internal structure of the material and the formation of defects, and achieving precise control of the microstructure of the material. Both use the violent reaction conditions brought about by high-temperature thermal shock to promote efficient modification of the target material.
Rapid heating and performance optimization: The ultrafast heating strategy achieves efficient preparation of SACs through rapid heating, optimizes its structure and performance, and significantly improves its catalytic activity and stability. FJH technology is also commonly used for rapid heating and performance optimization in the preparation of other materials. For example, in the preparation of carbon-based materials such as graphene, the defect density and electronic structure of the material can be regulated by rapid heating, thereby optimizing its conductivity and chemical activity.
High efficiency and low cost: The ultrafast heating strategy can complete the preparation of SACs in a very short time, which is highly efficient. FJH technology also greatly shortens the time of material preparation, improves production efficiency and reduces production costs with its characteristics of rapid heating and cooling. The combination of the two can further improve the efficiency and performance of material preparation, reduce production costs, and provide technical support for large-scale production of high-performance materials.
Environmental friendliness: The ultrafast heating strategy avoids the long-term energy consumption and environmental pollution problems in the traditional high-temperature treatment process. FJH technology does not require the use of solvents or reaction gases during the material synthesis process, and has low energy consumption, which meets the current requirements of environmental protection and sustainable development.
Further optimization of material properties: FJH technology can be applied to the subsequent treatment of SACs treated by ultrafast heating strategy. Through further rapid heat treatment, the crystal structure and defect distribution of the catalyst can be optimized to improve its catalytic activity and stability. For example, more uniform defect distribution and stronger metal-support interaction can be achieved through FJH technology, which enhances the catalyst's anti-sintering ability and long-term stability.
Development of new materials: Combine the rapid synthesis capability of FJH technology and the structural regulation advantage of ultrafast heating strategy to explore and develop new catalysts. For example, try to use FJH technology to quickly heat treat and optimize the structure of other types of metal or non-metal catalysts, and then use ultrafast heating strategy to synthesize them to achieve higher performance and better application effects.
Optimization and standardization of process parameters: In-depth study of the synergistic mechanism of FJH technology and ultrafast heating strategy in the material preparation process, optimize process parameters such as heating temperature, heating time, current density, etc. Establish a standardized process flow to ensure the stability and consistency of material performance, and provide reliable technical guarantees for the commercial production and application of catalysts.
Preparation of ZnO nanowires: Janghyun Jo of the Jülich Research Center in Germany and the Paloma Fernández Sánchez team of the Complutense University of Madrid successfully prepared ZnO nanowires with a size of 20-80 nm by Joule heating. The particles are evenly distributed on the carbon fiber substrate and show strong mechanical adhesion and high conductivity, which significantly improves stability. This method shows the potential for wide application in optoelectronic devices, gas sensors, nanoluminescent elements and biomedicine.
Rapid liquid-phase assisted ultra-high temperature sintering: ScienceNet reported a rapid liquid-phase assisted ultra-high temperature sintering method that can achieve effective densification without completely melting the material and maintain the uniformity of the high entropy structure. By rapidly heating to a temperature of 3000 K, a eutectic liquid phase is formed between the high entropy metal diboride and boron carbide, which helps to quickly fill the pores between the grains and form a low-melting dodecaboride phase. This method is not only suitable for densification of composite materials, but also can be used to prepare thin films and coatings, showing a wide range of application potential.
Technology Promotion and Large-Scale Production: The ultrafast heating strategy significantly reduces the preparation cost and energy consumption of SACs, providing a feasible path for the large-scale production of high-performance catalysts. In the future, it is expected to be industrialized in optoelectronic devices, gas sensors and other electrocatalytic fields.
Expanding the material system: The ultrafast heating strategy process provides a reference for the preparation of a variety of high-performance catalysts, such as high-entropy nitrides, borides and multi-component composite materials. These new materials can further meet the needs of different industrial fields.
In-depth research and process optimization: Subsequent research can focus on the in-depth analysis of the reaction mechanism and microstructure evolution during the ultrafast heating strategy, while optimizing equipment and process parameters to improve the consistency and stability of material properties, laying the foundation for further promoting the application of high-performance catalysts.
Electrospinning Nanofibers Article Source:
https://doi.org/10.1088/2631-7990/ac670b
