Fuel cells and rechargeable metal-air batteries are a kind of zero-emission clean energy technology. The development of fuel cells and rechargeable metal-air batteries technology has a positive effect on mitigating environmental pollution and energy crisis. The catalytic conversion of small molecules such as oxygen and hydrogen is the most important reaction in the energy conversion process of the battery. How to improve the performance of the catalyst and reduce its cost has always been a key technical bottleneck for the development of this type of battery. Designing an efficient catalyst with excellent performance is a Urgent and challenging tasks.
Recently, scientists in China have used the high-voltage pulsed direct current generated by the layered friction nano-generator as a new power source to electrodeposit sub-2 nm platinum (Pt) nanoclusters onto NiFe-LDH nanosheets without any end-capping agent. Pt-NiFe-LDH catalyst with excellent performance. The synergy between Pt nanoclusters and NiFe-LDH nanosheets enhances the cleavage of the HO-H bond and the reorganization of hydrogen intermediates to form molecular hydrogen, which significantly improves the hydrogen evolution reaction (HER) activity. At the same time, by reducing Fe3 + to Fe2 + to adjust the local atomic structure and crystal defects, NiFe-LDH nanosheets also enhanced the oxygen evolution reaction (OER) activity, and the deposited sub-2nmPt nanoclusters also increased the oxygen reduction reaction (ORR) activity. Therefore, the prepared Pt-NiFe-LDH catalyst exhibits trifunctional catalytic activity against HER, ORR and OER, and can be used as an electrode catalyst for fuel cells and rechargeable zinc-air batteries. The research results provide new ideas for improving the catalytic activity of fuel cells and rechargeable metal-air batteries HER, ORR and OER.
Overhead sectional door most widely used for loading areas on all types of industrial premises and Designed with a curved overhead track, these vertically-opening sectional doors can be installed in areas with reduced head room. They provide heat and sound insulation with its composite panel construction.
The counterbalance and cable system provides quiet and straight forward operation for manual doors. Electric operation is available for larger applications that can incorporate many alternative operator options to suit all client requirements.
The standard outer panels are manufactured from 0.5mm thick, high quality zinc coating to BS EN 10147
For the best weather protection the sectional door panel has an interlocking hinged joint integrating a high quality seal the full length of the panel.
A counterbalance system is incorporated into the sectional overhead door to ensure efficient and effortless operation.
The counterbalance comprises of springs mounted on a steel shaft that are high tensile helical wound steel. It has been heat treated for enhanced performance for around 50,000 cycles.
Reducing shaft friction is achieved with the aid of brackets and guide rollers incorporating highest quality sealed bearings.
Overhead Sectional Door,Overhead Sectional Garage Door,Automatic Overhead Sectional Door, Overhead Insulated Garage Door
Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hffreezerdoor.com