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High-temperature thermal shock and material modification: Professor Chen Yuan's team used Joule heating (JH) technology to achieve ultra-high-speed heating (reaching 900°C in 9 seconds) through rapid current heating, converting ZIF-8 into a carbon catalyst with a high degree of graphitization and optimized graphitic nitrogen active sites. Flash Joule Heating Machine (FJH) technology can also quickly heat the material to a high temperature, triggering the reorganization of the internal structure of the material and the formation of defects, and achieving precise control of the material's microstructure. 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: Joule heating technology achieves efficient preparation of carbon catalysts through rapid heating, optimizes the degree of graphitization and active sites of the catalyst, and significantly improves the oxygen reduction reaction (ORR) performance. 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: Joule heating technology can complete the preparation of catalysts in a short time and 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 catalyst preparation, reduce production costs, and provide technical support for large-scale production of high-performance catalysts.
Environmental friendliness: Joule heating technology avoids the high energy consumption and environmental pollution problems in the traditional high-temperature furnace heating process. FJH technology does not require the use of solvents or reaction gases during the material synthesis process and has low energy consumption. The combination of the two helps to achieve a greener and more sustainable catalyst preparation process, which meets the current requirements of environmental protection and sustainable development.
Further optimization of catalyst performance: FJH technology can be applied to the subsequent treatment of carbon catalysts prepared by Joule heating. Through further rapid heat treatment, the metal particle size, distribution and interaction with the carrier of the catalyst can be optimized to improve its catalytic activity and stability. For example, the FJH technology can achieve a more uniform distribution of active sites and stronger metal-support interactions, enhancing the catalyst's anti-sintering ability and long-term stability.
Development of new catalysts: Combine the rapid synthesis capability of FJH technology and the structural regulation advantages of Joule heating technology to explore and develop new catalysts. For example, try to use other types of metal organic frameworks (MOFs) or covalent organic frameworks (COFs) for rapid heat treatment and structural optimization through FJH technology to achieve higher catalytic activity and better selectivity.
Optimization and standardization of process parameters: In-depth study of the synergistic mechanism of FJH technology and Joule heating technology in the catalyst 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 catalyst performance, and provide reliable technical support for the commercial production and application of catalysts.
Electrospinning Nanofibers Article Source:
https://doi.org/10.1038/s41467-020-20084-5
