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حرية الوصول المقاله
1 - One-dimensional simulation of hydrogen production kinetic models by water vapor plasmolysis in a DBD plate reactor
Mostafa El-Shafie Shinji Kambara Yukio HayakawaAbstractThe results of one-dimensional time-dependent simulation modeling of hydrogen production from water vapor dissociation using non-thermal discharge plasma in a plate-type reactor were developed. Three different water vapor dissociation reaction mechanisms pathway أکثرAbstractThe results of one-dimensional time-dependent simulation modeling of hydrogen production from water vapor dissociation using non-thermal discharge plasma in a plate-type reactor were developed. Three different water vapor dissociation reaction mechanisms pathway models were simulated at a water vapor temperature of 573 K and same boundary conditions. The electron collision cross sections of electron water vapor were utilized based on the reaction mechanisms. The electron attachment and detachment processes were described in detail; additionally, the surface charge accumulation, recombination of charged species, positive and negative ions production and losses are considered. The electron density, electric field, electric potential, electron temperature and the hydrogen mass fraction are presented across the plasma discharge gap and over time. The first model was described as direct water vapor decomposition into their constituent’s elements hydrogen and oxygen molecules. It was revealed that the formed hydrogen molecules increased across the plasma discharge gap over time. In model II, the simulation reaction mechanisms pathway included products of H2O+, OH+, and O+ ions. It was found a significant change in the electric potential and electric field across the discharge gap due to the charged species inside the plasma gap. In model III, it was introduced H− radicals which controlled H atoms production by the electron detachment reaction. The most interesting results of these simulation models were the growing of hydrogen molecules across the plasma gap over time. Further, it was observed that the produced hydrogen mass fraction from model III was higher than model II and model I. تفاصيل المقالة -
حرية الوصول المقاله
2 - None-platinum electrode catalysts and membranes for highly efficient and inexpensive H2 production in microbial electrolysis cells (MECs): A review
Abudukeremu Kadier Washington Logroño Pankaj Kumar Rai Mohd Sahaid Kalil Azah Mohamed Hassimi Abu Hasan Aidil Abdul HamidMicrobial electrolysis cell (MEC) is a gripping bio-electrochemical device producing H2 gas from renewable biomass while at the same time treat wastewater. Through extensive global research efforts in the latest decade, the performance of MECs, including energy efficien أکثرMicrobial electrolysis cell (MEC) is a gripping bio-electrochemical device producing H2 gas from renewable biomass while at the same time treat wastewater. Through extensive global research efforts in the latest decade, the performance of MECs, including energy efficiency, hydrogen production rate (HPR), and hydrogen recovery have achieved significant breakthroughs. However, employing a low-cost, stable and high efficient cathode to replace platinum catalyzed cathode (Pt/C) is the greatest challenge for large-scale industrialization of MEC. Numerous studies have demonstrated that the performance of MEC directly depends on the kinetics of the anode and cathode reactions within the electrolysis cell, with the performance of the electrode catalyst highly affected by the materials they are made from. In a relatively short space of time, a wide range of electrode materials have been tested to amplify the performance of MECs, such as carbon-based electrode catalysts have emerged as promising electrode materials for both anode and cathode construction. Composite materials have also shown to have the potential to become materials of choice for electro-catalyst manufacture. More recently, various transition metal oxides and alloys have been extensively examined as alternatives to conventional expensive noble-metals like platinum for hydrogen evaluation reaction (HER) in MECs. Numerous studies have confirmed that stainless steel, Ni alloys, and Pd nanoparticle decorated cathode are worth mentioning and have very good efficiency. In the present article, we present a comprehensive review centered on the development of a low-cost and high efficient electrode materials and membrane to boost the performance of MECs, including anode, cathode, and membrane. تفاصيل المقالة -
حرية الوصول المقاله
3 - نانوچندسازه منیزیم فریت/گرافن اکسید کاهیده و کاربرد فتوکاتالیستی آن در تخریب آلاینده و تولید سوخت
مجید غنیمتی محسن لشگری واسیلیوس بیناستهیه مواد نانوچندسازه کارآمد با استفاده از عناصر فراوان زمین و ترکیب های دوستدار محیط زیست و کاربرد آن ها با هدف تخریب نور کاتالیستی مواد خطرناک و تولید سوخت، یک راهبرد پایدار برای حذف آلاینده و تامین هیدروژن به عنوان سوخت سبز (فاقد کربن) در دنیای مدرن است. در این پ أکثرتهیه مواد نانوچندسازه کارآمد با استفاده از عناصر فراوان زمین و ترکیب های دوستدار محیط زیست و کاربرد آن ها با هدف تخریب نور کاتالیستی مواد خطرناک و تولید سوخت، یک راهبرد پایدار برای حذف آلاینده و تامین هیدروژن به عنوان سوخت سبز (فاقد کربن) در دنیای مدرن است. در این پژوهش، نیم رسانای نانوساختار منیزیم فریت (MgFe2O4) سنتز و برای تولید گاز هیدروژن از راه شکافت نوری محلول قلیایی سیر شده از H2S و تخریب فتوکاتالیستی آلاینده مقاوم رنگ آزو (متیل اورانژ) استفاده شد. بررسی ها مشخص کرد فتوکاتالیست سنتزی، از توانایی لازم برای تخریب آلاینده و تولید هیدروژن برخوردار است. برای بهبود فعالیت فتوکاتالیست، پیش ساز گرافن اکسید به روش هامرز اصلاح شده تهیه و از آن به شکل مستقیم در سنتز آب گرمایی نانوچندسازه منیزیم فریت/گرافن اکسید کاهیده استفاده شد. شواهد نشان داد وجود گرافن اکسید کاهیده و تشکیل نانوچندسازه قادر است توانایی رنگ زدایی و تولید هیدروژن را از راه افزایش مساحت سطح فتوکاتالیست، کاهش بازترکیب الکترون-حفره و تقویت جذب فوتون، به مقدار قابل توجهی افزایش دهد. بازده تخریب پس از یک ساعت کار فتوواکنشگاه برابر با 84 درصد و سرعت آزادسازی هیدروژن برابر با 5567 میکرومول بر ساعت بر گرم فتوکاتالیست به دست آمد که بیانگر عملکرد خوب فتوکاتالیست نانوچندسازه برای حذف آلاینده و تولید سوخت است. تفاصيل المقالة -
حرية الوصول المقاله
4 - Capacity assessment of large-scale wind hydrogen production in very hot and humid region of Iran: A case study
Maryam Khalili GeshniganiIn recent years, hydrogen production from renewable energy has been attracting the attention of investors and politicians in the world. Although green hydrogen is still in its early stages in Iran, it has a high potential for development. Considering the importance of t أکثرIn recent years, hydrogen production from renewable energy has been attracting the attention of investors and politicians in the world. Although green hydrogen is still in its early stages in Iran, it has a high potential for development. Considering the importance of the above-mentioned facts and Iran's very good wind potential, the present study was the first attempt to investigate hydrogen production from wind energy in the hot and humid climate zone of Iran. The investigated stations were 5 cities of Khuzestan province and 4 large scale wind turbines were selected to be evaluated. A numerical analysis on wind data and the best fit of the Weibull function for the stations were done. Based on the coefficients k and c of the Weibull function, the amount of hydrogen produced by electrolysis was calculated. The results of the study showed that the EWT 900-52 wind turbine produced the most wind electricity, an annual 4645.85 megawatt hours of wind electricity equivalent to 68.3 tons of hydrogen, in all the investigated stations. Moreover, the suitable station was found to be Dezful, which can produce 20.36, 16.45, 11.93 and 9.44 tons of hydrogen when using wind turbines EWT 52-900, AWE 54-900, AWE 52-750 and Hewind 43-600 respectively. تفاصيل المقالة
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