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"Less is more" is a word spoken by the famous architect Mies van der Veldow. This "less is more" design concept is to promote simple forms and oppose excessive flashiness, thinking that simple things often bring more people. Enjoyment. Can this design concept have reference value in the field of materials science? Recently, a work completed by Prof. Xiong Yujie’s team at the University of Science and Technology of China fully demonstrated the superiority of the “less is more†design in the design of electrocatalytic hydrogen evolution materials. This result was published in the German Journal of Applied Chemistry.
As we all know, hydrogen energy has a very high energy density and extremely low environmental pollution, which is crucial for the development of the use of clean energy. The electrocatalytic hydrogen evolution reaction is a cathodic process of hydrogen deposition corrosion on the surface of a metal electrode and is an important process for producing hydrogen in a reversible hydrogen fuel cell. Metal platinum is the most catalytically active metal material in this series of reactions, but its high cost has motivated people to find ways to reduce the amount of platinum. To date, the industry has not yet been able to develop technologies that reduce platinum levels and maintain high electrocatalytic activity.
Researchers designed a platinum-palladium-graphene lamination composite structure for this bottleneck, and developed a synthetic method for precise control of the thickness of the platinum layer, thereby constructing a series of composite structures with a controlled thickness of the platinum layer. This series of composite structures exhibits tunable performance in the electrocatalytic hydrogen evolution reaction. When the thickness of the platinum layer is controlled in the range of 4 atomic layers, the highest performance value is achieved, and the current density at -300 mV is 791 mA cm-2 and Tafi. The 10mV decade-1 slope is far superior to the current commercial platinum carbon electrode materials.
Professor Jiang Jun of the Chinese University of Science and Technology Group studied the interface of platinum and palladium through theoretical simulation methods and found that the difference in the work function between the two metals could lead to polarization on the surface of the platinum metal, thereby accumulating negative charges on the surface of the metal and facilitating hydrogen evolution. The reaction occurred. Further size-dependent studies show that the polarization decreases with the increase of the thickness of the platinum layer, so the electrocatalytic hydrogen evolution performance can be regulated through the thickness control of the platinum layer in the experiment.
This advancement will enable the industry to greatly increase the electrocatalytic hydrogen evolution activity while reducing the amount of platinum metal used, paving the way for the development of low-cost, high-performance electrocatalytic materials. The findings of the study will help to deepen people's understanding of charge polarization behavior and mechanism in composite materials and also play an important role in the rational design of composite structure electrocatalysts.
The above research work has been funded by the Ministry of Science and Technology's "973" program, the National Natural Science Foundation, the National Youth 1000-person Program, and the 100-person plan of the Chinese Academy of Sciences.
40W Glue Guns Features:
1. Versatile
2. Easy
3. Quick
4. Proective Nozzle Cover
5. Trigger Flow Control
6. Bonds instantly
7. High quality
8. High temperature or low temperature
9. New design
10. With switch function
11. Big power
12. Industrial use
Idea for many applications. Fastening various materials such as paper, cardboard, fabric,wood, lace,trims,leather,metal,glass, tiles, rubber, ceramics and flooring etc.Ideal for hobby and household repair,DIY&craft projects.
Designed and manufactured to the highest of standards to ensure a robust and long life, we hope it provides you with many years of trouble-free, safe and reliable service.
General Safety Information:
1. Check if the plug cord was in good condition, and if there is stand before plug into the electrical outlet ; Check if the used glue gun has glue flow through back of the tunnel;
2. wait 5-10 minutes to allow glue to soften, stand up the glue gun on the table when not in use;
3. Touch nozzle to any clean, dry surface you wish to bond, to avoid any impurity stop the nozzle;
4. If the glue could not flow from the nozzle when the glue gun start to work, check if the glue gun are heating;
If glue gun can not be heated, there are following reasons:
1 Plug cord into electrical outlet not properly;
2 Glue gun has been destroyed owing to inner cord short circuit;
If glue gun can be heated, there are following reasons: Nozzle has been stopped by any impurity, ask careerman to manage it.
5. Do not use the glue gun under moist climate, humidity will affect insulation and cause electric shock;
6. Do not touch the nozzle or melted glue;
7. Do not remove out the melted glue stick from the tunnel back side, it will damaged the glue gun as well as scalding person hands.
8. Do not to disassemble or assemble any glue gun accessories freely, it will cause glue gun do not work properly;
9. Keep out of reach of children and stocked it beyond any of Children palpable side;
10. Only used for melting glue stick, no other usage;
11. When in use, there are any glue flow back from tunnel, stop using immediately, wait for careerman clean the glue;
12. Close the power if the glue gun not in use after 15 minutes;
Using methods
1. Glue gun using voltage is 110-220V AC,50/60Hz;
2. Tip gun forward on stand and place a piece of cardboard under the nozzle
3. Use 7-8mm (mini trigger glue gun), 11-12(big trigger glue gun), insert glue sticks through
tunnel at back of gun
4. After power, wait for 5-10 minutes to allow glue to soften
After glue softens, squeeze trigger to feed glue through glue barrel. Excessive force will damage glue gun. Put down nozzle after work, disconnect the power plugProfessional Glue Gun, 40W Glue Guns, Silicone Glue Gun, Hot Melt Glue Gun
Ningbo Kingvos Electrical Appliance Co.,Ltd , http://www.kingvos.com