What are the general requirements of an alkaline fuel cell AFC electrode?

The alkaline fuel cell (AFC) electrode refers to its positive and negative electrode, and the alkaline fuel cell is the first fuel cell for obtaining an application. In AFC, the concentrated KOH solution is either as an electrolyte and as a coolant. It plays a role from the cathode to the anode, and the operating temperature of the battery is generally 80 degrees Celsius and is very sensitive to CO2 poisoning. The general requirements for the AFC electrode are as follows: (1) Good conductive capacity to reduce ohmic resistance; (2) A sufficient mechanical stability and appropriate aperture; (3) Chemical stability in (alkaline) electrolyte; (4) Long-term electrochemical stability, including the stability of the catalyst and the stability of the electrode composition. The type and mode of production of the anode and cathode are related to the selected catalyst. Unlike PAFC, AFC is not only precious metal, not precious metals are also applicable. Platinum or platinum alloy can be deposited on carbon or form a metal electrode (mostly nickel base). When using non-precious metals, Nickel nickel is used as an anode, and the silver-based catalyst powder is a cathode. Another important nature is the hydrophilic and hydrophobicity of electrode materials. The hydrophilic electrode is typically a metal electrode, and a PTFE (polytetrafluoroethylene) in the carbon-based electrode can adjust the wettability of the electrode, thereby maintaining sufficient hydrophobicity in a suitable configuration containing the PTFE catalyst. The life of the electrode is very important. Typically, the electrode material is composed of several different pores to allow the liquid electrolyte, gas fuel (hydrogen) or oxidant (air or oxygen) to remain inherent or flow through the electrode. The key to the electrode technology is to manufacture a certain layer of such electrodes or electrodes, typically, is typically mixed with powder and press it on the membrane. Sedimentary techniques, spray techniques, and high temperature sintering are used to ensure their good process stability. The basic fuel cell usually uses potassium hydroxide or sodium hydroxide as an electrolyte, and the conductive ion is OH-, and the fuel is hydrogen. 1, anode reaction: H2 + 2OH- → 2H2O + O2 standard electrode potential is -0.0828V 2, cathode reaction: 1 / 2O2 + H2O + 2E- → 2OH-standard electrode potential is 0.401V 3. Total reaction: 1 / 2O2 + o2 + H2 → H2O theoretical electric motor is 0.401 - (- 0.828) = - 1.229V 4, AFC catalyst mainly uses noble metal platinum, palladium, gold, silver and transition metal nickel, cobalt, manganese, etc. Advantages of AFC High efficiency, because the reduction reaction in the alkaline medium is higher than other acid media; Because it is an alkaline medium, a non-platinum catalyst can be used; Due to the low working temperature, alkaline medium, the bipolar plate can be made with a nickel plate. Disadvantages of AFC Because the electrolyte is alkaline, it is easy to generate K2CO3, Na2CO3 precipitation with CO2, which seriously affects battery performance, so CO2 must be removed, which gives it a big difficulty in conventional environments. The hydraulic problem of the battery is complicated, affecting the stability of the battery. 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