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High-temperature thermal shock and material modification: Professor Li Ju's team quickly synthesized high-entropy oxide (HEO) electrocatalysts for oxygen evolution reaction (OER) through carbon thermal shock (CTS) technology. This technology breaks through the traditional thermodynamic equilibrium through rapid heating and cooling to form HEO uniformly distributed on the carbon fiber substrate. 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 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: CTS technology achieves efficient preparation of HEO catalysts through rapid heating, optimizes its structure and performance, and significantly improves the catalytic performance of oxygen reduction 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: CTS technology can complete the preparation of catalysts in a very short time and is highly efficient. FJH technology also has the characteristics of rapid heating and cooling, which greatly shortens the time of material preparation, improves production efficiency and reduces production costs. 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: CTS 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.
Further optimization of material properties: FJH technology can be applied to the subsequent treatment of HEO catalysts treated by CTS technology. 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-carrier interaction can be achieved through FJH technology, enhancing 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 CTS technology 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 CTS 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 CTS 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 catalysts.
Preparation of high entropy oxide catalysts: Professor Li Ju's team successfully synthesized HEO nanoparticles with a size of 20-80 nm through CTS technology. 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 water electrolysis hydrogen production and other clean energy fields.
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 high entropy metal diborides and boron carbides, which helps to quickly fill the pores between grains and form a low-melting dodecaboride phase. This method is not only suitable for densification of composite materials, but can also be used to prepare thin films and coatings, showing a wide range of application potential.
Technology Promotion and Large-Scale Production: CTS technology significantly reduces the preparation cost and energy consumption of catalysts, providing a practical path for large-scale production of high-performance catalysts. In the future, it is expected to be industrialized in fuel cells, water electrolysis and other electrocatalytic fields.
Expanding the material system: The CTS 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 CTS process, 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/10.1021/acs.cgd.4c01012
