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چکیده
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Utilization of renewable sources and waste conversion processes is increasing in the world because of global warming. An estimated of 4 billion waste tire (WT) are currently in landfills and stockpiles worldwide. Scince waste tires do not decompose easily due to their cross-sectional structure and the presence of various additives. The best economic and environmental solution would be to recycle used tires and use them as materials for value-added products [1]. There are several methods for recycling worn tires. Pyrolysis as one of the most important methods is a thermal decomposition process performed at high temperature in an inert atmosphere [2]. Solid residues from tire pyrolysis are often called coal or carbon black. Black carbon is a carbon compound with a carbon content higher than 80 %wt, but the surface area of the resulting carbon is not large enough and its porosity is low, so in order to be used as an adsorbent and energy storage, it must be activated in certain ways. Activation of carbon takes place in two ways: physical activation and chemical activation. Tire-derived activated carbon have numerous advantage such as a high surface area with porosity. Thus, this paves the way for the recycling of waste tires, and this porous activated carbon can be used as an adsorbent as well as promising materials as support in various electrochemical applications [3]. Supercapacitors (SCs), also known as electrochemical capacitors, are some of the most promising energy storage devices due to their higher power density, longer lifespan, and better safety tolerance than batteries [4]. In recent years, the design and fabrication of supercapacitors have become an important research area due to their high power density, relatively high energy density and long cycle life in power source applications. General electrode materials mainly involve carbon materials, transition metal oxides and conductive polymer materials. However, relatively low energy density of carbon materials often limits their large-scale application. Consequently, transition metal oxides and conductive polymer materials have attracted much more attention and have been extensively employed as electrode materials owing to their redox pseudo-capacitance [5]. The purpose of this research is to prepare activated carbon with high surface area and porosity from the pyrolysis of domestic car tire in a chemical methode. Then, by depositing polyoxometalates and conductive polymers on activated carbon, composites will be prepared which used as electrodes in supercapacitors. The capacitance of these electrodes will be examined by electrochemical methods.
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