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Institution

Shahed University

EducationTehran, Iran
About: Shahed University is a education organization based out in Tehran, Iran. It is known for research contribution in the topics: Population & Fuzzy logic. The organization has 3173 authors who have published 5371 publications receiving 59291 citations.


Papers
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Journal ArticleDOI
TL;DR: An overview of the energy storage devices from conventional capacitors to supercapacitors to hybrid systems and ultimately to batteries is provided, although the focus is kept on capacitive and hybrid energy storage systems.
Abstract: Over the past decade, electrochemical energy storage (EES) devices have greatly improved, as a wide variety of advanced electrode active materials and new device architectures have been developed. These new materials and devices should be evaluated against clear and rigorous metrics, primarily based on the evidence of real performances. A series of criteria are commonly used to characterize and report performance of EES systems in the literature. However, as advanced EES systems are becoming more and more sophisticated, the methodologies to reliably evaluate the performance of the electrode active materials and EES devices need to be refined to realize the true promise as well as the limitations of these fast-moving technologies, and target areas for further development. In the absence of a commonly accepted core group of metrics, inconsistencies may arise between the values attributed to the materials or devices and their real performances. Herein, we provide an overview of the energy storage devices from conventional capacitors to supercapacitors to hybrid systems and ultimately to batteries. The metrics for evaluation of energy storage systems are described, although the focus is kept on capacitive and hybrid energy storage systems. In addition, we discuss the challenges that still need to be addressed for establishing more sophisticated criteria for evaluating EES systems. We hope this effort will foster ongoing dialog and promote greater understanding of these metrics to develop an international protocol for accurate assessment of EES systems.

695 citations

Journal ArticleDOI
TL;DR: In this article, C. C. cyminum and R. officinalis essential oils extracted by hydrodistillation from Cuminum and Rosmarinus officinalises were characterized by means of GC and GC-MS.
Abstract: Essential oils extracted by hydrodistillation from Cuminum cyminum and Rosmarinus officinalis were characterized by means of GC and GC–MS. C. cyminum and R. officinalis contained α-pinene (29.1%, 14.9%), 1,8-cineole (17.9%, 7.43%) and linalool (10.4%, 14.9%), respectively, as the major compounds. C. cyminum oil exhibited stronger antimicrobial activity than did R. officinalis oil against E. coli, S. aureus and L. monocytogenes. Complete death time on exposure to Cuminum cyminum L. and Rosmarinus officinalis L. oils were 20 and 25 min 180 and 240 min and 90 and 120 min for E. coli, S. aureus and L. monocytogenes, respectively. Radical-scavenging and antioxidant properties were tested by means of 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay and the β-carotene bleaching test. These properties were compared to those of Thymus x-porlock essential oil, used as a reference ingredient. The radical scavenging performance of the rosemary oil was better than that of C. cyminum. Results from the antioxidant test were better than those provided by the radical-scavenging activity. C. cyminum and R. officinalis essential oils may be considered as potent agents in food preservation.

453 citations

Journal ArticleDOI
TL;DR: In this article, a sonochemical assisted precipitation followed by thermal treatment has been used to synthesize copper oxide (CuO) nanoparticles, which have been anchored on surface of graphene oxide (GO) nanosheets through a simple electrostatic coprecipitation.
Abstract: Copper oxide (CuO) nanoparticles have been synthesized through a sonochemical assisted precipitation followed by thermal treatment. As prepared CuO nanoparticles have been anchored on surface of graphene oxide (GO) nanosheets through a simple electrostatic coprecipitation. Prepared samples have been characterized using X-ray diffraction (XRD), Fourier transform infrared (FTIR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and energy dispersive X-ray analysis (EDX). Morphology of the samples has been characterized by field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). Symmetric supercapacitors have been assembled in real two-electrode configurations. Different symmetric configurations including CuO, GO, layer-by-layer coated CuO on GO network (GO/CuO), and composite (COMP) electrodes have been prepared. Their electrochemical behavior and supercapacitive performances have been investigated and compared with each other using various electrochemical methods including cyclic voltammetry, electrochemical impedance spectroscopy, and chronopotentiometric charge/discharge cycles. The composite material shows better electrochemical supercapacitive behavior and lower charge transfer resistance compared to other samples. It also shows better specific capacitance (245 F g −1 ) at current density of 0.1 A g −1 compared to the pure components (125 F g −1 for CuO and 120 F g −1 for GO) and the layer-by-layer coated electrodes (155 F g −1 ). Conducting charge/discharge measurements for 1000 cycles and in different current densities, it has been found that the composite material is a promising candidate for supercapacitor application, in terms of cycle ability and rate capability.

352 citations

Journal ArticleDOI
TL;DR: An asymmetric supercapacitor composed of mesoporous CuCo2O4 nanowires for the positive electrode and activated carbon for the negative electrode demonstrates an ultrahigh energy density of 42.8 Wh kg 1 with a power density of 15 kW kg 1 plus excellent cycle life as discussed by the authors.
Abstract: The search for faster, safer, and more efficient energy storage systems continues to inspire researchers to develop new energy storage materials with ultrahigh performance. Mesoporous nanostructures are interesting for supercapacitors because of their high surface area, controlled porosity, and large number of active sites, which promise the utilization of the full capacitance of active materials. Herein, highly ordered mesoporous CuCo2O4 nanowires have been synthesized by nanocasting from a silica SBA-15 template. These nanowires exhibit superior pseudocapacitance of 1210 F g–1 in the initial cycles. Electroactivation of the electrode in the subsequent 250 cycles causes a significant increase in capacitance to 3080 F g–1. An asymmetric supercapacitor composed of mesoporous CuCo2O4 nanowires for the positive electrode and activated carbon for the negative electrode demonstrates an ultrahigh energy density of 42.8 Wh kg–1 with a power density of 15 kW kg–1 plus excellent cycle life. We also show that two a...

344 citations

Journal ArticleDOI
TL;DR: In this article, mechanisms of symbioses between soil fungi, arbuscular mycorrhizae, and most terrestrial plants are reviewed, in the hope that this may result in more efficient use of AM under different stress conditions.
Abstract: The development of symbioses between soil fungi, arbuscular mycorrhizae (AM), and most terrestrial plants can be very beneficial to both partners and hence to the ecosystem. Among such beneficial effects, the alleviation of soil stresses by AM is of especial significance. It has been found that AM fungi can alleviate the unfavourable effects on plant growth of stresses such as heavy metals, soil compaction, salinity and drought. In this article, such mechanisms are reviewed, in the hope that this may result in more efficient use of AM under different stress conditions.

333 citations


Authors

Showing all 3183 results

NameH-indexPapersCitations
Gevork B. Gharehpetian5168911011
Mohammad Reza Rahimpour4949310790
Behnam Vahdani411323911
Mehrdad Roghani372524350
Behrooz Karimi361544227
Mohammad Miransari351054570
Fatemeh Sefidkon331523521
Majid Sadeghizadeh322614226
Soghrat Faghihzadeh322943644
Hamed Ahmadi312753538
Parviz Owlia291842753
Ali Asghari28612387
Iraj Rasooli281294330
S. Meysam Mousavi28812120
Nader Fallah27722366
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20234
202226
2021435
2020479
2019510
2018433