Advanced Energy Technologies
Mahdi Saadati pour; Mona Zamani Pedram
Abstract
This abstract offers a comprehensive review of recent advancements in Graphene Carbon Nitride (GCN) as a highly promising electrode material for supercapacitors. GCN boasts exceptional advantages, including abundant availability, a metal-free composition, high nitrogen content, and remarkable environmental ...
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This abstract offers a comprehensive review of recent advancements in Graphene Carbon Nitride (GCN) as a highly promising electrode material for supercapacitors. GCN boasts exceptional advantages, including abundant availability, a metal-free composition, high nitrogen content, and remarkable environmental sensitivity. These unique characteristics have positioned GCN at the forefront of research in energy storage and supercapacitor electrode materials. However, despite its potential, GCN faces challenges concerning limited specific capacity and energy density. To address these limitations, this review, as the first and most comprehensive in its field, focuses on innovative and novel development methods, particularly the strategic formation of nanostructures in 1, 2, and 3 dimensions. A notable finding of this review is the tremendous promise of 3D structures in enhancing the electrochemical properties of GCN as a supercapacitor electrode. A critical research gap in other review articles is the absence of comprehensive and innovative literature investigating nanostructures (1D, 2D, and 3D) with novel synthesis methods for using GCN as a supercapacitor electrode. This underscores the pressing need for further scholarly investigation in this area, as addressed by this review article. Overall, this professional review not only provides a comprehensive overview of advancements in GCN as a supercapacitor electrode material but also offers valuable guidance for researchers in the field. It highlights the importance of utilizing environmentally friendly synthesis techniques for fabricating multidimensional nanostructures, illuminating novel research directions and pioneering investigations. This empowers researchers to advance the utilization of GCN in energy storage applications.
Advanced Energy Technologies
Mohammad Saleh Barghi Jahromi; Vali Kalantar; Mohammad Sefid; Masoud Iranmanesh; Hadi Samimi Akhijahani
Abstract
Paraffin waxes are widely used as commercial organic heat storage phase changes (PCM) for many applications due to their suitable properties. Significant heat from fusion, nonpoisonous and stable properties, no phase separation, and the phase process result in a small volume change. Meanwhile, they are ...
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Paraffin waxes are widely used as commercial organic heat storage phase changes (PCM) for many applications due to their suitable properties. Significant heat from fusion, nonpoisonous and stable properties, no phase separation, and the phase process result in a small volume change. Meanwhile, they are subject to low thermal conductivity. The thermal conductivity of PCMs can be increased by different techniques such as the use of dispersion of particles or nanomaterials with high conductivity in PCM and the use of metal foams. The use of nanoparticles has such disadvantages as high cost and particle deposition after various cycles. Hence, in this study, some experiments were carried out to investigate the effect of porous media like copper foam and iron wool as the filler instead of nanomaterials on improving the heat conductivity of PCM. The results show that the porous foam increases the heat transfer and during the charging operation, the temperature of the porous plate wall increases continuously at the same rate as the paraffin. At 2400 s, the temperature of pure PCM, iron wool, and copper foam reaches 67.3, 72.5, and 73.27℃, respectively. The optimal mode is the one in which the copper absorber plate is connected to the copper foam, thus reducing the charging time by 600 s compared to pure PCM and saving 75% of energy. Connecting the copper absorber plate to the iron wool has a good thermal performance and stores 70.83% of energy. Thus, iron wool has an acceptable performance and is suitable for storage systems.
Advanced Energy Technologies
Samira Jafari; Mehran Ameri Mahabadi
Abstract
As a result of growing energy demand, shortage of fossil fuel resources, climate change, and environmental protection, the need for renewable energy sources has been growing rapidly. However, there is an urgent need to cope with intermittency and fluctuation of renewable energies. Various energy storage ...
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As a result of growing energy demand, shortage of fossil fuel resources, climate change, and environmental protection, the need for renewable energy sources has been growing rapidly. However, there is an urgent need to cope with intermittency and fluctuation of renewable energies. Various energy storage systems are considered as appropriate solutions to the above-mentioned problem. In the present manuscript, a novel compressed carbon dioxide energy storage system was proposed. Furthermore, an extra thermal energy storage with Therminol VP-1 as a working fluid, coupled with Parabolic Trough Collector (PTC), was added to the system. This integration is conducive to rising the inlet temperature of turbines and reducing the work load that should be done by the compressors. In the present study, a method based on software product including Engineering Equation Solver (EES) for determining thermodynamic characters per component and System Advisor Model (SAM) was employed to model the solar field for a desired location. Energy and exergy analyses were conducted to evaluate the whole cycle performance during charging and discharging periods. In this study, the city of Kerman located in the south-eastern part of Iran, with Direct Normal Incidence (DNI) of 950 , was selected for the present modeling. The results of a random day (June 22/2019) at time 15:00 represented the exergy efficiency of 66.98 % and the round trip efficiency of 93.14 %. High exergy efficiency and round trip efficiency of this system make this idea applicable to enhancing the total performance of the entire system.