The research team of thin film materials and surface technology of Central South University has been conducting in-depth research on the application of diamond coatings in superhard tool coatings, organic wastewater treatment, advanced thermal management materials and biosensors, and has pioneered the use of chemical vapor deposition (CVD). The method of preparing foamed diamond, on the basis of which water treatment electrode and diamond reinforced high thermal conductivity composite material have been made, has made breakthroughs in both research directions recently. The research results have been published in the international authoritative journal Applied Catalysis B: Environmental (impact Factor 11.698) and Applied Energy (impact factor 7.9).
China's annual wastewater discharge exceeds 70 billion tons. Electrochemical oxidation technology is one of the most promising biodegradable organic wastewater treatment technologies. The core of the technology is electrode materials and their preparation. Boron-doped diamond (BDD) electrodes are a recent study. Hot spots, these electrodes have the widest electrochemical window (up to 4.5V), extremely high oxygen evolution potential (up to 3V), excellent chemical stability, and can be long in strong acid, alkali and high salt environments. Time runs continuously. However, a closed two-dimensional flat BDD electrode is generally used, which has a small specific surface area and a slow mass transfer rate. The reaction process is controlled by a diffusion process, and organic substances in the liquid phase cannot be rapidly diffused to the surface of the electrode to be directly oxidized or electrocatalyzed. The indirect oxidation of strong oxidizing substances (such as hydroxyl radicals) severely restricts the efficiency of electrochemical oxidation of BDD to organic wastewater.
For the first time in the world, the team used chemical vapor deposition (CVD) technology to construct a BDD foam electrode with a three-dimensional network macroporous structure on foamed nickel. Compared with the same size closed type two-dimensional plate electrode, the BDD foam electrode is not only electrochemically effective. The area is increased by 20 times, and the three-dimensional network pore structure with uniform distribution and adjustable size can freely circulate the wastewater, greatly accelerate the convection of the liquid phase and the electrode surface, and improve the mass transfer rate of the liquid phase. The synergistic effect of “large specific surface area + high mass transfer rate†greatly improves the degradation efficiency of the electrode. At a small current density of 2.4 mA/cm 2 , the BFD foam electrode electrochemically degrades the reactive blue 19 by only 95% in 1 h. The mineralization rate is over 80%. BDD foam electrode has excellent electrochemical performance, simple and repeatable preparation method, high space utilization rate, and several BDD foam electrodes are assembled together to form an actual wastewater treatment with light weight, small footprint, high efficiency and low energy consumption. The device has a very broad application prospect in the field of refractory organic wastewater. In addition, the successful preparation of BDD foam electrodes will also facilitate the application of diamond in the fields of electrocatalysis, electrosynthesis, electrochemical sensing, and supercapacitors.
"3D macroporous boron-doped diamond electrode with interconnected liquid flow channels: A high-efficiency electrochemical degradation of RB-19 dye wastewater under low current", published in the international authoritative journal Applied Catalysis B: Environmental (impact factor 11.698), 2016 Masters Mei Ruiqiong and Associate Professor Wei Qiuping are co-first authors, Professor Zhou Kechao of the Powder Metallurgy Research Institute, Associate Professor Ma Li and Associate Professor Wei Qiuping of the School of Materials Science and Engineering are the co-authors. Central South University is the first unit.
The latent heat storage can absorb or release a large amount of heat when the material undergoes phase change, realizing the storage and utilization of energy, which can effectively solve the contradiction between energy supply and demand in space and time. In recent years, it has become a research hotspot in the field of energy storage and utilization. . However, latent heat storage materials generally have shortcomings such as low thermal conductivity and poor heat transfer performance, which greatly limits their wide application and development. For the first time, the team introduced high-quality foam diamond into the phase change material, and increased the thermal conductivity from 0.25 W/mK to 6.7 W/mK by constructing a three-dimensional connected diamond rapid thermal conduction channel in the paraffin phase change material, which is higher than paraffin. 25.8 times. Moreover, with high thermal conductivity carbon materials such as graphite, carbon nanotubes, graphene, etc., the foamed diamond has no obvious thermal anisotropy, and the contribution of the composite volume per unit volume to the thermal conductivity is in the same level in the same field.
The research results "Thermal conductivity enhancement of phase change materials with 3D porous diamond foam for thermal energy storage", published in the international authoritative journal Applied Energy (influence factor 7.9), 2016 doctoral students Zhang Long and Professor Zhou Kechao as the co-first author Associate Professor Wei Qiuping is the author of the communication, and Central South University is the first unit.
While strengthening the application of basic research, the team focused on national technology needs and actively responded to the call of “Made in China 2025†and “Innovation Drives Economic Development Transformation and Upgradingâ€, focusing on diamonds in wastewater treatment, advanced thermal management materials, coated tools and Applications in the field of biosensors, published more than 80 papers in SCI, and filed 32 Chinese invention patents (26 authorized) and 2 international PCT invention patents, and successfully carried out relevant technology research and application. 5 patented technologies of “Chemical Vapor Deposition Equipment and Its Supporting Technology†independently developed, 5 patented technologies of “Chemical Vapor Deposition Diamond Coated Tools and Mould Series Products and Industrialized Production Technology†and “Bondon Doped Diamond Electrode for Wastewater Treatment†And its industrialized production technology, three patent technologies have completed the technology incubation, and become the only scientific research unit in China that can realize large-area and large-scale preparation of boron-doped diamond electrodes. The related devices and products have been scaled up and marketed. .
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