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High-temperature thermal shock and material modification: Professor Yao Yonggang, Professor Xia Baoyu of Huazhong University of Science and Technology and Professor Wang Yuhua's team of Wuhan University of Science and Technology used metal organic framework (MOF) as precursor and combined it with rapid carbon thermal shock process (1200°C, 0.1 seconds) to prepare high entropy alloy. This method makes full use of the three-dimensional porous structure of MOF, avoiding the problems of Zn volatilization and Mo carbonization while alloying at high temperature instantaneously. Flash Joule Heating Machine (FJH) technology can also quickly heat the material to high temperature, triggering the reorganization of the internal structure of the material and the formation of defects, and realizing precise control of the microstructure of the material. Both of them take advantage of the violent reaction conditions brought by high-temperature thermal shock to promote efficient modification of the target material.
Rapid heating and performance optimization: The rapid carbon thermal shock process achieves efficient preparation of high entropy alloys through rapid heating, optimizes its structure and catalytic performance, and significantly improves the efficiency of oxygen evolution reaction (OER). 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 rapid carbon thermal shock process can complete the preparation of high entropy alloys in a very short time, which is highly efficient. FJH technology also greatly shortens the time for 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 the large-scale production of high-performance materials.
Environmental friendliness: The rapid carbon thermal shock process 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 high entropy alloys after rapid carbon thermal shock process. Through further rapid heat treatment, the crystal structure and defect distribution of the alloy 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 can enhance the sintering resistance and long-term stability of the alloy.
Development of new materials: Combine the rapid synthesis capability of FJH technology and the structural regulation advantages of rapid carbon thermal shock process to explore and develop new catalytic materials and conductive materials. For example, try to use FJH technology to perform rapid heat treatment and structural optimization on other types of metal or non-metal alloys, and then use rapid carbon thermal shock process to synthesize them to achieve higher performance and better application effect.
Optimization and standardization of process parameters: In-depth study of the synergistic mechanism of FJH technology and rapid carbon thermal shock process in the material preparation process, and 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 guarantee for the commercial production and application of materials.
Preparation of graphene film: Professor Hu Liangbing's team used Joule heating ultra-high temperature reduction technology to instantly heat the pretreated RGO film to 2750K, achieving efficient defect repair and high crystallization of the structure, and significantly improving the conductivity of the film. This method not only improves production efficiency, but also significantly reduces energy consumption, providing a new technical path for the large-scale production of graphene films.
Preparation of high-entropy alloy catalysts: High-entropy alloys were prepared by using metal organic frameworks (MOFs) as precursors and combining rapid carbon thermal shock processes (1200°C, 0.1 seconds), and high-performance MoZn-based high-entropy alloy catalysts were successfully synthesized. This method not only avoids the occurrence of element volatilization and side reactions, but also significantly improves the structural stability and active site exposure of the catalyst, providing an important reference for the design and practical application of complex multi-component materials.
Technical scalability: As an efficient and rapid preparation technology, Joule heating can be applied to the research and development of other two-dimensional materials and nanostructures. For example, the graphene film prepared by FJH technology is significantly better than the traditional graphene oxide film in heat dissipation performance, showing a more uniform heat dissipation effect.
Industrialization potential: The light weight and flexibility of the highly conductive RGO film make it an ideal material to replace the metal current collector, and it is expected to be promoted in energy devices such as lithium-ion batteries and supercapacitors. In addition, the application of FJH technology in the preparation of high-performance graphene films also demonstrates its great potential in flexible electronics, photovoltaics, energy storage and other fields.
Future research direction: Further optimize the Joule heating process to reduce energy consumption and cost, and study the application possibility of this technology in the preparation of larger-scale films and multifunctional devices. At the same time, combined with machine learning and big data analysis, optimize the composition and microstructure of high-entropy alloys to further enhance their catalytic performance and practical application capabilities.
Electrospinning Nanofibers Article Source:
https://www.science.org/doi/10.1126/sciadv.adq6758
