China Drying Network News Recently, Dr. Deng Dehui of the State Key Laboratory of Catalysis of the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences, researcher Pan Xiulian, academician Bao Xinhe, etc. cooperated with the Fuel Cell Research Department of the Clean Energy National Laboratory to complete the replacement of the precious metal catalyst with iron for the first time. experiment of. The relevant research results were published online today in the German Applied Chemistry. It is understood that the use of hydrogen to generate electricity is an important goal for the development of advanced and sustainable energy systems in the future. To achieve this goal, proton exchange membrane fuel cells, which are important energy conversion devices, will play an irreplaceable role. However, this type of fuel cell requires a large amount of precious metals, such as platinum, palladium, rhodium, etc. as a catalyst, thereby affecting its large-scale application. Therefore, it has become a major opportunity and challenge in this field to substantially reduce the precious metal content in the fuel cell electrode material, and to eventually replace the precious metal completely with the abundant "cheap" metal elements on the earth. To this end, the research team creatively confined iron-based metal nanoparticles to the lumen of a carbon nanotube with a pod-like structure, using the newly developed deep ultraviolet light emission electron microscope of the research group and using Shanghai Light Source Advanced. The X-ray absorption spectrum, combined with theoretical calculations, for the first time observed that the active d electrons of the metallic iron “pass through†the carbon nanotube wall through interaction with the carbon atoms constituting the carbon nanotube wall, so that the electrons enriched on the outer surface of the carbon tube are enriched. Directly catalyzes the reduction of molecular oxygen. The experimental and theoretical studies further confirmed that in this system, the carbon wall encapsulating the nano-metal iron blocks the direct contact between the reaction gas and the iron nanoparticle, and in principle avoids deep oxidation of the active metal iron nanoparticle during the reaction. As well as the poisoning of other harmful components in the reaction atmosphere to the catalyst, the problem of stability of the nanometal iron as a cathode catalyst of the fuel cell is fundamentally solved. Industry experts believe that this study not only provides an effective approach for the research of precious metal alternatives for fuel cell catalysts, but also that the concepts developed have opened up new directions for the design and preparation of catalysts that operate under severe conditions. The above research has been funded by the National Natural Science Foundation of China and the Ministry of Science and Technology. PTA Powder
Main application:Repair and
strengthen workpiece surface, significantly
Welding method:PTA welding
Main equipment:PTA welding
machine
Flame core temperature: about 10000℃
Technological characteristics:PTA has high
temperature, concentrated energy, stable combustion, small heat affected zone,
fast welding speed, high production efficiency, easy to obtain low dilution
rate of surfacing layer, surfacing layer and workpiece matrix are metallurgical
bonding,, bonding strength is high.
PTA welding technology is one of surface
strengthening methods, which has high deposition rate, low dilution rate, and
could be applied with many kinds of powder. The manufacturing craft of PTA
powder is normally gas atomization, which reduces satellite of powder. We
supply 4 main categories of PTA powder: Nickel-based alloy powder, Iron-based
alloy powder, Cobalt-based alloy powder and Mixed Powder.
Nickel Based Alloy Powder possesses high
temperature resistance and wear resistance, it is the most popular alloy powder
applied by PTA welding both domestically and internationally. Coating hardness
is within the range of HRC 30-60. It could be applied to various industries
like agriculture, plastic, paper, marine and steel making where wear and
corrosion protection needed. Some examples are plunger, moulds, pump leaf and
screw.
Iron Based Alloy Powder is more widely used
and a more economic choice. With high abrasive resistance, it is more commonly
applied to mining tools, drilling tools and mixers of iron and steel making
industry, coal industry, shaft, oil and energy industry.
Cobalt Based Alloy Powder is recommended
for corrosion and oxidation resistance, with better hot hardness values than
equivalent Nickel based alloy powder. It is widely applied to steel making
industry, coal industry and mining industry.
Mixed powder mainly refers to NiCrBSi
mixing with other hard-phase powder such as cast tungsten carbide and other cemented
alloy powder, which allows the powder better hardness around HRC60 and
excellent abrasion resistance.
Mixed powder is more often used for mining
equipment for oil sands, lignite, oil drilling tools, excavator buckets,
extrusion screws for plastic processing, grain and oil processing, etc.
PTA Powder,Iron Based Alloy Powder,Cobalt Based Alloy Powder,Nickel Based Alloy Powder Luoyang Golden Egret Geotools Co., Ltd , https://www.egretgeotools.com
