Flash Joule Heating Machine: Preparation of Cr=N2=Fe bimetallic atomic cluster catalyst by rapid Joule heating at 1300°C in 10 seconds

Views: 999 Author: Nanofiberlabs Publish Time: 2025-01-17 Origin: cluster catalyst

Similarity of technical principles and applications

 

High-temperature thermal shock and material modification: The team of Professor Guo Hong and Associate Professor Chen Anran used rapid Joule heating technology (1300, about 10 seconds) to prepare Cr=N2=Fe bimetallic catalysts. Rapid heating achieved atomic-level dispersion of Cr and Fe atoms, avoiding metal agglomeration caused by traditional high-temperature and long-term treatment. 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: 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 reduction reaction (ORR). 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, rapid heating can regulate the defect density and electronic structure of the material, thereby optimizing its conductivity and chemical activity.

 

Complementarity of technical advantages

 

High efficiency and low cost: Rapid Joule heating technology can complete the preparation of high entropy alloys 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 due to 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: Rapid Joule heating technology avoids the long-term energy consumption and environmental pollution problems in traditional high-temperature treatment. 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.

 

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Combination direction of future research and application

 

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, enhancing the alloy's anti-sintering ability and long-term stability.

 

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 quickly heat treat and optimize the structure of 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, 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.

 

Specific application cases

 

Study on the 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 are 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 shows 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 ultrahigh 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.

 

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Future Outlook

 

Technical Scalability: Ultrafast Joule heating technology, as an efficient and fast preparation 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 films make them ideal materials for replacing metal current collectors, and are 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-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://doi.org/10.1016/j.ensm.2024.103927


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