Professor Zhang Qiang, Tsinghua University, Adv. Mater .: Asymmetric Air Cathode Design Enhanced Interfacial Electrocatalytic Reaction in High Performance Zinc Air BatteryIn the zinc air battery (ZABS), the air cathode is composed of an oxygen electrical catalyst and a hydrophobic gas diffusion layer (GDL) on the hydrophilic substrate to promote an oxygen reduction reaction (ORR) and an epoxy reaction (Oer). However, in the air cathode, the electrochemical reaction involving the gas mainly occurs between the solid electrocatalyst, the liquid electrolyte and oxygen, which means that only the contactless electrocatalyst of the interface area can complete its role. Therefore, it is necessary to effectively utilize electrocatalysts having high internal activity, there must be a multi-phase interface with rich and stable electrocatalytic active sites. Despite this, the interface engineering of the air cathode is rarely attached. The conventional air cathode is loaded with a hydrophilic dual function electrocatalyst layer on the surface of the hydrophobic GDL by a drip or spraying method to construct a multi-phase reactive interface, however, this cathode structure provides a near-phase interface of nearly 2D, it The narrow space being limited between the electrocatalyst layer and GDL. Since this two-dimensional interface can only be exposed to a small portion of the electrocatalyst located near the surface of the GDL, most catalytic sites cannot make practical contributions, and even if the functional active site also has a negative contact with the reaction interface. , Easily fall into the electrolyte during the oxidative reaction process.
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Common imported batteries include: Sanyo battery, Panasonic battery, LG battery, Samsung lithium battery.
In order to overcome the limitations of the two-dimensional response interface, the Tsinghua University Zhang Qiang Professor Zhang Qiang first proposed a new dimension interface strategy, its core thinking is to extend the original two-dimensional multi-phase interface to the GDL direction, construct a three-dimensional internal GDL internal Multi-phase react interface. Compared to the 2D interface that is limited to the GDL surface, the 3D reaction interface is significantly increased in the number of active catalysts, even if some electrocatalysts fall off and in the three-dimensional interface area, they can still function. On this basis, the author designed an asymmetrical air cathode to increase the activity center, accelerate mass transfer, and generate a dynamic stable reaction interface. The NiFe layer-shaped bio-hydroxide is used as the electrocatalyst, and the ZABS based on the asymmetric cathode provides a smaller charge and discharge voltage gap (5.0 mA cm? 2 is 0.81 V), high power density and excellent cycle stability (more than 2000 laps). Recommend: LiFePO4 Battery Manufacturer Energy storage battery Manufacturer Integrated machine energy storage battery series Manufacturer Lead lithium battery Manufacturer Outdoor Backup Battery Manufacturer Portable outdoor power supply Manufacturer Power battery Manufacturer Powerwall LiFePO4 Battery Manufacturer Battery rack Manufacturers Telecom LiFePO4 Battery Manufacturer Wall mounted battery storage Manufacturer China Lifepo4 Battery
