Search for: electrochemical-cells
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    Modified antisolvent method for improving the performance and stability of triple-cation perovskite solar cells

    , Article ACS Omega ; Volume 6, Issue 1 , 2021 , Pages 172-179 ; 24701343 (ISSN) Samadpour, M ; Golchini, A ; Abdizadeh, K ; Heydari, M ; Forouzandeh, M ; Saki, Z ; Taghavinia, N ; Sharif University of Technology
    American Chemical Society  2021
    Antisolvent crystallization is known as an effective approach for the deposition of pinhole-free solution-processed perovskite layers for high-performance solar cells. Here, we introduce a modified antisolvent dripping method by adding tetra ethyl orthosilicate (TEOS) into chlorobenzene as a conventional antisolvent. Through TEOS modification, perovskite solar cells show efficiencies as high as 16% with more than 85% retention after 290 h storage at ambient conditions in comparison to 20% in pristine cells. This significant enhancement in efficiency and stability mainly related to the decrement of the density of surface defects, which is confirmed by considerably enhanced photoluminescence... 

    Theoretical Investigation of Coupled Microbial Electrochemical Cells in Micro-Sized Systems and Assessment of Biohydrogen Generation

    , M.Sc. Thesis Sharif University of Technology Arab Yarmohammadi, Fatemeh (Author) ; Yaghmaei, Soheila (Supervisor) ; Mardanpour, Mohammad Mahdi (Co-Supervisor)
    Due to the importance of hydrogen production for its applications in therapy, this research reports the fabrication of a coupled microfluidic microbial electrochemical cell, including microfluidic microbial fuel cells (MFCs) and a microfluidic microbial electrolysis cell (MEC) series in order to perform it as a selfpowered bioenergy generator to produce biohydrogen with no need for an external power source. The designed went goes through a validation process that relied on experimental results of a coupled system in glucose degradation. By determining the governing equations of the system and simulating its behavior in various conditions, the effect of operational factors on the system... 

    The coupled microfluidic microbial electrochemical cell as a self-powered biohydrogen generator

    , Article Journal of Power Sources ; Volume 451 , 2020 Fadakar, A ; Mardanpour, M. M ; Yaghmaei, S ; Sharif University of Technology
    Elsevier B.V  2020
    Due to the importance of hydrogen as an effective antioxidant for its applications in therapy, this research reports the fabrication of a coupled microfluidic microbial electrochemical cell (MXC), including microfluidic microbial fuel cells (MFCs) and a microfluidic microbial electrolysis cell (MEC) series in order to perform it as a self-powered biohydrogen generator. Being able to be a platform of implantable medical devices, utilization a non-phatogenic strain of Escherichia coli as the biocatalyst in order to exploit the embodied energy from human blood and excrement and finally the use of cheap and facile materials (<$2 per device) are the exceptional features of the system. The... 

    The Fabrication of the Coupled Microfluidic Microbial Electrochemical Cells for Oxalate Biodegradation

    , M.Sc. Thesis Sharif University of Technology Yahyanezhad Gele, Maedeh (Author) ; Yaghmaei, Soheila (Supervisor) ; Mardanpour, Mohammad Mahdi (Co-Supervisor)
    This study invewstigates the performance of a coupled microfluidic microbial fuel cell-microbial electrolysis cell producing biohydrogen in presence of shewanella oneidensis MR-1 from excreted oxalate of human metabolic processes. The effect of different parameters such as cell geometry including spiral and straight microchannels, precipitation of nano-particles on anode surface, substrate flowrate and the number of microfluidic microbial fuel cell supporting required power for microbial electrolysis cell were assessed. By anode modification, the maximum current density of 428 W m-3 was obtained which is less than 6-fold of the maximum power density in the cell fabricated by zinc foil. The... 

    Synthesis of Graphene and its Application for Adsorption of Cobalt and Strontium Ions, and as an Electrode in Electrochemical Cells (Battery)

    , M.Sc. Thesis Sharif University of Technology Jalilzadeh, Hassan (Author) ; Outokesh, Mohammad (Supervisor) ; Hosseinpour, Morteza (Co-Supervisor)
    Although much progress has been made in eliminating, conserving, and reducing migration and emissions of radioactive materials, the risk of radioactive material release into the environment is still one of the most important hazards in the use of nuclear energy. In this study, graphene compounds have been used as adsorbents for the removal of radioactive materials due to their high level, cost-effectiveness and simplicity of the synthesis process of various composites. In this regard, the removal of strontium and cobalt by graphene compounds has been investigated. Magnetite nanoparticles were anchored on the surface of graphene by sol-gel method and adsorption in batch mode was investigated.... 

    The effects of non-uniform distribution of catalyst loading on polymer electrolyte membrane fuel cell performance

    , Article International Journal of Hydrogen Energy ; Volume 32, Issue 17 , December , 2007 , Pages 4424-4437 ; 03603199 (ISSN) Roshandel, R ; Farhanieh, B ; Sharif University of Technology
    The catalyst layers are the most important part of the polymer electrolyte membrane (PEM) fuel cells, and the cell performance is highly related to its structure. The gas diffusion layers (GDLs) are also the essential components of the PEM fuel cell since the reactants should pass through these layers. Model prediction shows that electrical current in catalyst layer is non-uniform, influenced by the channel-land geometry. In addition, the compression effect of GDLs and water generation due to the electrochemical reaction may cause non-uniformity in porosity and, therefore, increases the non-uniformity in reactant concentration in GDL/catalyst layer interface. Simulation results suggest that... 

    Produced Water Treatment with Simultaneous Bioenergy Production Using Novel Bioelectrochemical Systems

    , Article Electrochimica Acta ; Volume 180 , 2015 , Pages 535-544 ; 00134686 (ISSN) Ghasemi Naraghi, Z ; Yaghmaei, S ; Mardanpour, M. M ; Hasany, M ; Sharif University of Technology
    Elsevier Ltd  2015
    The present study investigated the biological treatment of produced water in a microbial electrochemical cell (MXC). The main objectives were to develop a novel spiral microbial electrochemical cell (SMXC) and test its performance for produced water treatment under highly saline conditions (salinity > 200000 ppm). The bioelectrochemical performance of the system was also evaluated in terms of power and hydrogen production over time. The comparatively inexpensive material and ease of application increased the feasibility of the SMXC configuration for produced water treatment. Optimal SMXC performance as a microbial fuel cell was achieved at a maximum open circuit potential of 330 mV, maximum... 

    A generalized model for complex wastewater treatment with simultaneous bioenergy production using the microbial electrochemical cell

    , Article Electrochimica Acta ; Volume 167 , 2015 , Pages 84-96 ; 00134686 (ISSN) Karimi Alavijeh, M ; Mardanpour, M. M ; Yaghmaei, S ; Sharif University of Technology
    Elsevier Ltd  2015
    The objective of this study was to construct a novel model to be applied in a general manner to simulate microbial electrochemical cells (MXCs); for both microbial fuel cell (MFC) and microbial electrolysis cell (MEC). The liquid bulk was modeled based on the organic matters degradation to acetate via the anaerobic digestion process. Biofilm simulation was established based upon one-dimensional distribution and the dynamical electron transfer was completed by means of the conduction-based mechanism. We, for the first time, introduced biofilm local potential modeling for MEC simulation with general and simplified linear boundary conditions. The MFC-related part of the model was evaluated...