The electrode paste is a vital component of the aluminum electrolytic cell that is used in the production of aluminium. It is made of petroleum coke, pitch coke and coal tar pitch as aggregates and binders. It is also filled graphite and with other additives to enhance its properties.
The quality of the electrode paste should be monitored throughout the entire manufacturing process due to its importance in the production of aluminium. Raw materials, processing conditions, and quality control measures are the main factors that affect the quality of electrode paste.
Electrode paste is manufactured through a series of processes, including mixing, kneading, extrusion, baking and crushing. It is then screened to remove any oversized particles. It is essential that the electrode paste has good adherence, low porosity and high conductivity. In addition, the paste should be able to withstand high temperatures and oxidation.
Various carbon additives and allotropes are mixed in order to create electrode paste (CP). These CPs undergo high-temperature sintering in order to achieve the desired porous structures and material properties. The properties and compositions are directly related to the performance of carbon electrodes, and their interfacial contacts with perovskite layer underneath.
For a high-performance electrode, it's important to control sintering temperature as well as pore size. The sintering temperatures of carbon paste are affected by several factors, including the calcination conditions of petroleum coke and the sintering times. The sintering temperature, as well as the pyrolysis duration of the binder, determine the pore sizes.
The properties of carbon electrodes can also be affected by the temperature and duration of curing. For m -CEs, it is important to remove organic solvents from the CPs (such as ethanol or Isopropyl alcohol) before curing. For p-CEs it is necessary to sinter the binders at high temperatures in order to pyrolyse them and create the mesoporous structure of the CEs.
In order to optimize the sintering of the electrode paste, a number of studies have been carried out on the effects of processing conditions on final morphology of the carbon materials. In order to investigate the effects, several characterization tools have been developed. These include transmission electron microscopy and scanning electron microscope. These techniques are useful in identifying the best sintering parameters, depending on the type of carbon and additives. This will enable the development a new generation carbon electrodes with a high efficiency and stability. These advanced electrodes are critical for future solar power applications.
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