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High-temperature thermal shock and material modification: Professor Chen Guozhu of Jinan University, Researcher Yang Jun of the Institute of Process Engineering of the Chinese Academy of Sciences, Tian Shaonan, and Associate Professor Xu Lin of Nanjing Normal University proposed a new method combining rapid Joule heating and mechanical ball milling to prepare carbon-based Ni100−xFex alloy nanoparticles and achieve efficient oxygen evolution reaction (OER). This method uses rapid Joule heating to reduce nickel and iron precursors at high temperatures to form alloy nanoparticles. 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 achieve 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: Rapid Joule heating technology achieves efficient preparation of high-entropy alloys through rapid heating, optimizes their 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: Rapid Joule heating technology can complete the preparation of high-entropy alloys in a very short time, and 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: Rapid Joule heating technology avoids the long-term energy consumption and environmental pollution problems in traditional high-temperature treatment processes. FJH technology does not require the use of solvents or reaction gases during material synthesis, 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 treated by rapid Joule heating technology. 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 Joule heating technology 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 metals or non-metallic alloys, and then use rapid Joule heating technology 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 rapid Joule heating technology 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 guarantees for the commercial production and application of materials.
Thermal behavior of kaolin: Professor Huang Zhaohui's team at China University of Geosciences (Beijing) systematically studied the thermal behavior and phase change characteristics of Guangxi sandy kaolin and Inner Mongolia hard kaolin in the range of 400°C to 1200°C by ultrafast Joule heating technology combined with multi-dimensional characterization methods such as XRD, FT-IR, TG-DSC and SEM. The study found that there were significant differences between sandy kaolin and hard kaolin in terms of dehydroxylation temperature, phase change energy requirements and mullite formation crystallinity, among which hard kaolin showed higher mullite crystallinity and conversion efficiency. This method not only reveals the dynamic structural evolution law of kaolin under ultrafast heating conditions, but also provides an important technical reference for the rapid processing and heat treatment research of mineral 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, 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.
Technical Scalability: As an efficient and fast preparation technology, ultrafast Joule heating technology 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 highly conductive RGO film make it an ideal material to replace metal current collectors, 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 Directions: Further optimize the ultrafast Joule heating process to reduce energy consumption and cost, and study the application possibility of this technology in the preparation of larger-sized films and multifunctional devices. At the same time, combined with machine learning and big data analysis, the composition and microstructure of high-entropy alloys are optimized to further enhance their catalytic performance and practical application capabilities.
Electrospinning Nanofibers Article Source:
https://doi.org/10.1021/acsaenm.4c00591
