Renewable energy will play an extremely important role in the foreseeable future as people's demands for quality of life increase dramatically and national energy policies are adjusted. However, there are intermittent problems in renewable energy. For example, solar energy is affected by day and night changes, rainy weather, wind energy is affected by climate and wind speed instability. Therefore, it is necessary to vigorously explore renewable energy surplus power conversion technology. Among them, electrocatalytic hydrogen production technology is one of the best solutions at present. According to the difference of electrolytes, it can be divided into alkaline electrocatalytic hydrogen production and acid electrocatalytic hydrogen production. For alkaline electrocatalytic hydrogen production, the difficulty is hydrogen evolution on the cathode, and for acidic electrocatalytic hydrogen production, the difficulty is oxygen evolution on the anode.
In recent years, Chen Liang, a researcher of the New Energy Institute of the Institute of Materials Technology and Engineering of the Chinese Academy of Sciences, has conducted research on the two electrocatalytic hydrogen production problems described above through the effective combination of experiments and theories. Among them, Ph.D. Ge Ruixiang selectively prepared a carbon cloth-loaded yttrium phosphide nanoparticle film (RuP/CC) by simple dip coating and low temperature phosphating. In the alkaline solution, the new hydrogen evolution catalyst electrode requires only an overpotential of 13 mV when outputting a current density of 10 mA cm-2, and is one of the best catalysts for hydrogen evolution. Theoretical calculations show that the excellent activity of RuP is derived from its unique electronic structure: Compared with RuP2, the Ru site has a higher electron density at the Ru site, which enhances the adsorption strength of RuP to protons in solution, and thus has better hydrogen evolution activity ( Nanoscale, 2018, 10, 13930). Su Jianwei prepared a Cu-doped RuO2 hollow octahedral material assembled from ultra-small nanocrystals by calcining the metal organic framework derivative after Ru cation exchange as a precursor. At a current density of 10 mAcm-2, the overpotential is only 188 mV, which exhibits superior electrocatalytic oxygen evolution activity and stability than the commercial RuO2 electrocatalyst. Density functional theory simulation calculations show that the tri-coordinated Ru atoms on the high energy surface are gradually oxidized during the reaction process, which greatly reduces the reaction energy barrier of OER. At the same time, Cu doping can adjust the electronic structure of RuO2, thereby greatly improving its OER. Catalytic activity (Advanced Materials, 2018, 30, 1801351).
Recently, Lin Shuchao successfully prepared a new CrO2-RuO2 solid solution material by adsorbing RuCl3 precursor and annealing based on Cr-based metal organic framework materials. The structure of CrO2-RuO2 solid solution was determined by PXRD crystal repair and Vegard'law verification. The atomic resolution spherical electron microscopy directly observed that Cr and Ru atoms were uniformly distributed in the same nanocrystal. The material has an overpotential of only 178mV at a current density of 10mA cm-2, and after 10,000 cycles, the overpotential is only increased by 11mV, which is far superior to commercial RuO2. Through the near-side absorption test of synchrotron radiation, it was found that the Ru atom has a strong electron absorption effect of tetravalent Cr in the crystal structure, the valence state is slightly higher than the +4 valence, and the bond length of Ru-O becomes shorter. Tian Ziqi discovered through density functional simulation that it is precisely because of the electron-withdrawing effect of +4 valence Cr in the crystal lattice that the catalytic activity of Ru becomes higher and the reaction energy barrier is lowered. In addition, it is worth noting that the content of the noble metal Ru in the solid solution material is only 40%, which can significantly reduce the cost of the catalyst. This work was recently published on the topic of Chromium-ruthenium oxide solid solution electrocatalyst for highly efficient oxygen evolution reaction in acidic media (Nature Communications, DOI: 10.1038/s41467-018-08144-3). Lin Yichao and Tian Ziqi are the co-first authors of the paper, and Chen Liang is the author of the paper.
The above work was strongly supported by the Ministry of Science and Technology Key Research and Development Program, the Natural Science Foundation's Committee and Youth Project, and the Ningbo Innovation Team. The related synchrotron radiation experiments were also strongly supported by the Shanghai Institute of Applied Physics of the Chinese Academy of Sciences and Shanghai Light Source.
The machine is used for punching connecting holes at both ends of the scaffold vertical pole, it can punch four holes at one time, and it can also ensure the accuracy of the hole position.
Description of Pulley-clip scaffolding Automatic Punching Machine
Pipe quantity: punch one pipe at one time
Guarantee time: 1 year
MOQ: 1 set
OEM service: offered
Payment: T/T. L/C
Delivery: Tianjin port
FAQ:
Q: Can you customize the machine according to our workpiece requirement?
A:Yes, we can design the machine after you give us the technical drawing.
Q: How about payment terms?
A: 30% TT as deposit, 70% TT paid before shipment or against B/L copy.
Q: Installation and commissioning?
A: We will send our engineer for installation and commissioning
Q: Do you have some videos to show how the machine works?
A: Yes, we can provide some videos for reference.
Pulley-clip Scaffolding Automatic Punching Machine
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