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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Renewable Energy and Environment
- نوع مقاله: Journal Article
- کلمات کلیدی: Dissolved oxygen,Power Density,sediment microbial fuel cell,internal resistance
- چکیده:
- چکیده انگلیسی: Sediment microbial fuel cells (SMFCs) are a promising technology for a viable source of energy. This technology is faced with many challenges, such as limited mass transfer and low electricity generation. The aim of this research was to investigate the effect of electrolyte conductivity and aeration effect on power generation from SMFCs. Electrical conductivity was adjusted at 6different levels by adding several concentrations of NaCl and KCl, which are abundant and economic salts. By adding NaCl, the performance of SMFCs improved about 3.25 fold. Maximum generated power and current density of 32.76 mW/m2 and 330.14 mA/m2are obtained,respectively afterNaCl addition. Also, with aeration dissolved oxygen level increased as an electron acceptor in cathode portion, thereby power density enhanced from 16.36 mW/m2 to 38.31 mW/m2which was a 234% increase compared to the situation before aeration.
- انتشار مقاله: 11-10-1348
- نویسندگان: Zahra Najafgholi,Mostafa Rahimnejad,Ghasem Najafpour
- مشاهده
- جایگاه : پژوهشی
- مجله: Biofuel Research Journal
- نوع مقاله: Journal Article
- کلمات کلیدی: Microbial fuel cell,Cathode compartment,Graphite,Carbon cloth,CNT/Pt-coated Carbon paper
- چکیده:
- چکیده انگلیسی: Microbial fuel cell (MFC) is a prospective technology capable of purifying different types of wastewater while converting its chemical energy into electrical energy using bacteria as active biocatalysts. Electrode materials play an important role in the MFC system. In the present work, different carbon-based materials were studied as electrode and the effect of dissolved oxygen (aeration) in the cathode compartment using actual wastewater was also investigated. More specifically, the effect of different electrode materials such as graphite, carbon cloth, carbon paper (CP), and carbon nanotube platinum (CNT/Pt)-coated CP on the performance of a dual-chambered MFC was studied. Based on the results obtained, the CNT/Pt-coated CP was revealed as the best cathode electrode capable of producing the highest current density (82.38 mA/m2) and maximum power density (16.26 mW/m2) in the investigated MFC system. Moreover, aeration was found effective by increasing power density by two folds from 0.93 to 1.84 mW/m2 using graphite as the model cathode electrode.
- انتشار مقاله: 28-05-1394
- نویسندگان: Mehrdad Mashkour,Mostafa Rahimnejad
- مشاهده
- جایگاه : پژوهشی
- مجله: Biofuel Research Journal
- نوع مقاله: Journal Article
- کلمات کلیدی: Microbial fuel cell (MFC),Bioelectricity,Proton Exchange Membrane
- چکیده:
- چکیده انگلیسی: Microorganisms in microbial fuel cells (MFC) liberate electrons while the electron donors are consumed. In the anaerobic anode compartment, substrates such as carbohydrates are utilized and as a result bioelectricity is produced in the MFC. MFCs may be utilized as electricity generators in small devices such as biosensors. MFCs still face practical barriers such as low generated power and current density. Recently, a great deal of attention has been given to MFCs due to their ability to operate at mild conditions and using different biodegradable substrates as fuel. The MFC consists of anode and cathode compartments. Active microorganisms are actively catabolized to carbon sources, therefore generating bioelectricity. The produced electron is transmitted to the anode surface but the generated protons must pass through the proton exchange membrane (PEM) in order to reach the cathode compartment. PEM as a key factor affecting electricity generation in MFCs has been investigated here and its importance fully discussed.
- انتشار مقاله: 09-12-1392
- نویسندگان: Mostafa Rahimnejad,Gholamreza Bakeri,Ghasem Najafpour,Mostafa Ghasemi,Sang-Eun Oh
- مشاهده
- جایگاه : پژوهشی
- مجله: Biofuel Research Journal
- نوع مقاله: Journal Article
- کلمات کلیدی: Fuel cell,Bioelectricity,Power Density,Sulfide,Dual chamber
- چکیده:
- چکیده انگلیسی: Microbial fuel cells (MFCs) have recently been used to alter different sources of substrates to produce bioelectricity. MFCs can also be used for wastewater treatment and electricity generation simultaneously. Sulfur compounds such as sulfides commonly exist in wastewater and organic waste. In this study a dual chamber MFC was constructed for power production. Sulfide was used as the electron donor in the anaerobic anode compartment. A mixed culture of microorganisms was used as an active biocatalyst to convert the substrate into electricity. The obtained experimental results illustrated that the MFC can successfully alter sulfide to elementary sulfur while generating power. The initial concentration of sulfide in the anode compartment was 0.4 g l-1 and it was completely removed after 3 days of MFC operation. The influence of oxygen was examined in the cathode chamber and the cell voltage gradually increased during aeration, reaching 480 mV after 1200 s. Hexacyanoferrate was added to the cathodic solution in different concentrations and its effects were investigated. The maximum generated voltage, power and current density were 988.9145 mV, 346.746 mW.m-2, 1285.64 mA.m-2, respectively and they were obtained in the presence of 1.4 g l-1 of mediator.
- انتشار مقاله: 09-12-1392
- نویسندگان: Paniz Izadi,Mostafa Rahimnejad
- مشاهده
- جایگاه : پژوهشی
- مجله: Analytical and Bioanalytical Electrochemistry
- نوع مقاله: Journal Article
- کلمات کلیدی: Gold nanoparticles,Electrochemical sensor,Graphene nanoplatelets,Electrodeposition,gabapentin,Blood plasma
- چکیده:
- چکیده انگلیسی: Herein, gold nanoparticle had been successfully synthesized through a simple, inexpensive and clean electrochemical technique. Gold nanoparticles were directly deposited on the electrode surface using an electrochemical strategy. Then, the electrochemical deposition parameters (such as applied potential and deposition time) were optimized. 1.1 V and 250 s were applied as the optimal electrodeposition potential and time in the rest of the investigations. The fabricated electrode was morphologically characterized by field emission scanning electron microscopy and energy-dispersive X-ray spectroscopy methods. Under the optimized condition, the proposed sensor demonstrated the lowest detection limit (7.04 nM) in the linear range of 0.01–1 μM obtained by differential pulse voltammetry. The electrochemical properties of fabricated modified electrode were investigated by a different techniques such as cyclic voltammetry, linear sweep voltammetry, differential pulse voltammetry, and electrochemical impedance spectroscopy. The constructed electrode also showed a negligible response from common interferences and the fabricated sensor was applied for Gabapentin analysis in pharmaceutical samples.
- انتشار مقاله: 01-01-1399
- نویسندگان: Atieh Zabihollahpoor,Mostafa Rahimnejad,Ghasem Najafpour-Darzi,Ali Akbar Moghadamnia
- مشاهده