كليدواژه :
ابرخازن , نانو كامپوزيت , الكتروكاتاليست , ولتامتري چرخه اي
چكيده فارسي :
براي به كارگيري ابرخازن در وسايل با توان مصرفي بالا، عملكرد الكترود در چگالي جريان بالا از اهميت بالايي برخوردار است. مقدار ظرفيت ويژهيGO ،MoS2/rGO و نانو كامپوزيت در چگالي جريان 1 آمپر بر گرم به ترتيب 187 ، 395 و 538 فاراد بر گرم بدست آمد. يافتههاي اين پروژه نشان ميدهند كه از بين تمام مواد الكترودي، نانوكامپوزيت، زمان تخليهي طولاني و ظرفيت ويژهي بالايي دارد و اين به خاطر حضور ورقه هاي GO و ساختار هيبريدي منحصر به فرد نانو كامپوزيت FeNi-MoS2/rGO ميباشد كه در منحنيهاي CV هم مشاهده شده بود. بنابراين ابر خازن هيبريدي تهيه شده كاربرد عملي خوبي در ابزارهاي ذخيره كننده ي انرژي دارد.
چكيده لاتين :
In the near future, due to the continuous increase in the consumption of fossil fuels, the energy demand will reach more than thirty-five percent of the current value. This issue will put a lot of pressure on non-renewable energy sources. Therefore, the need to create new energy sources will be felt more and more day by day. The features considered for the new generation of energy sources are: availability of raw materials and easy start-up, no sound pollution, clean energy production and very high efficiency. Supercapacitor or electrochemical capacitor is one of the types of energy storage systems that are introduced to meet the ever-increasing needs of mankind in the field of energy conversion systems. Compared to batteries, supercapacitors have high power density and cycle life and have low charge/discharge time. However, these tools have relatively low energy density. To be used in devices with high consumption power, the performance of the electrode at high current density is of great importance. The prepared nanocomposite not only has excellent performance in high current density but also can keep its capacity well. According to the GCD curve for nanocomposite, the discharge time increases with decreasing current density. According to the cyclic voltammetry diagram for the nanocomposite in the selected environment and concentration and at different scan speeds, the current densities increase with the increase of the scan rate, and this is due to the presence of a large area of the electrode material that is in contact with the electrolyte ions. These results show the existence of a good ion conduction path in the fabricated electrode, which facilitates the movement of anions and cations even at high scanning rates. The value of specific capacitance of GO, MoS2/rGO and nanocomposite at the current density of 1 ampere/gram was obtained as 187, 395 and 538 Farad/gram, respectively. Therefore, the findings of this project show that among all the electrode materials, nanocomposite has a long discharge time and a high specific capacity, and this is due to the presence of GO sheets and the unique hybrid structure of nanocomposite which was also observed in the CV curves. Therefore, the prepared hybrid supercapacitor has a good practical application in energy storage devices.
