Browsing by Author "Devrim,Y."

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Citation - Scopus: 27
Assessment of Polybenzimidazole/Mof Composite Membranes for the Improvement of High-Temperature Pem Fuel Cell Performance
(Elsevier Ltd, 2024) Devrim,Y.; Colpan,C.O.; Energy Systems Engineering; 06. School Of Engineering; 01. Atılım University
This study aims to determine the most effective utilization of ZIF-8 type metal-organic framework (MOF) doped polybenzimidazole (PBI) composite membrane in high-temperature polymer electrolyte membrane fuel cells (HT-PEMFC) and investigate how ZIF-8 filler affects performance. ZIF-8 particles were prepared by solvothermal method and added to the PBI polymer using a weight percentage varying from 1 to 5 %. XRD, BET, and TEM examined the prepared ZIF-8. Composite membrane properties were investigated by XRD, SEM analysis, proton conductivity measurements, acid doping, and acid stripping tests. The HT-PEMFC performances of the membranes were carried out using Hydrogen and dry air at 150–180. The highest performance was acquired with the composite ZIF8/PBI-2 membrane as 0.432 W/cm2 at 170 °C. The obtained result is explained by easier proton transfer over ZIF-8's enlarged tunnel network. This study proposes a promising strategy to use ZIF-8 to prepare a PBI composite membrane with excellent proton conductivity, acid doping, and low acid leaching for HT-PEMFC application. The current study's findings can support future research on PBI/MOF-based composite membranes for HT-PEMFC applications. © 2024 Hydrogen Energy Publications LLC
Design and Optimization of Green Hydrogen-Based Hybrid Energy System
(International Association for Hydrogen Energy, IAHE, 2022) Ceylan,C.; Devrim,Y.; Energy Systems Engineering; 06. School Of Engineering; 01. Atılım University
Hydrogen (H2) is widely used in many industries because it can be used as a chemical raw material with its high mass-energy density and can be converted back into electricity via fuel cells. H2 energy systems seem to be one of the most effective solutions for providing a better environment and sustainability. Green H2, produced by renewable energy-assisted electrolysis without greenhouse gas emissions, has been of great importance in recent years. In this study, a hybrid energy system including Photovoltaic (PV), Wind Turbine (WT), Proton Exchange Membrane Fuel Cell (PEMFC), and electrolyzer is compared for grid-connected and off-grid operating conditions. In the grid-connected system, electricity generated from PV and WT is used directly to meet electricity demand, while excess electricity is used for green H2 production. In the off-grid connected system, electricity generated from PV and WT was used for H2 production. Produced H2 and O2 were used to generate electricity by PEMFC. While 20186 kWh energy & 3273 m3 H2 were generated in an on-grid connected system, 95145 kWh energy & 17942 m3 H2 and 83511 kWh energy & 14370 m3 H2 were generated in two different configurations in the off-grid connected system. The Levelized Cost of Energy (LCOE) for the on-grid connected system and the off-grid system for two different designs were determined as 0.307 $/kWh, 0.341 $/kWh and 0.349 $/kWh, respectively. The hybrid system design was simulated using MATLAB software and it was examined which hybrid energy system configuration would be the most economical to meet the load. © 2022 Proceedings of WHEC 2022 - 23rd World Hydrogen Energy Conference: Bridging Continents by H2. All rights reserved.
DEVELOPMENT OF BIMETALLIC ELECTROCATALYSTS FOR HIGH-TEMPERATURE ELECTROCHEMICAL HYDROGEN PURIFICATION
(International Association for Hydrogen Energy, IAHE, 2022) Bal,İ.B.; Durmuş,G.N.B.; Devrim,Y.; Mechanical Engineering; Energy Systems Engineering; 06. School Of Engineering; 01. Atılım University
In this study, PtRu/GNP, PtIr/GNP, and RuIr/GNP bimetallic catalysts were synthesized by microwave-assisted synthesis method, and their performances on the high-temperature electrochemical hydrogen purification (HT-ECHP) were compared. The structural and electrochemical characteristics of the bimetallic catalysts were examined by the TGA, XRD, XPS, and CV techniques. ECHP Tests were performed with reformate gas mixtures containing hydrogen (H2), carbon monoxide (CO), and carbon dioxide (CO2) at temperatures between 140-180°C. The gas at the exit of the ECHP cell was analyzed with the gas chromatography device (GC), and high H2 purity was achieved. © 2022 Proceedings of WHEC 2022 - 23rd World Hydrogen Energy Conference: Bridging Continents by H2. All rights reserved.
ELECTROCHEMICAL HYDROGEN SEPARATION FROM REFORMATE USING POLYBENZIMIDAZOLE/MOF COMPOSITE MEMBRANES
(International Association for Hydrogen Energy, IAHE, 2022) Durmuş,G.N.B.; Eren,E.O.; Devrim,Y.; Ozgur Colpan,C.; Özkan,N.; Mechanical Engineering; Energy Systems Engineering; 06. School Of Engineering; 01. Atılım University
This study introduces the experimental results of a high-temperature electrochemical hydrogen purification (ECHP) cell through poly 2.2-m-phenylene-5.5-bibenzimidazole/metal organic framework (PBI/MOF) composite membranes in the temperature range of 140°C-180°C. Synthesis of ZIF-8 and UiO-66 MOFs was conducted through a typical solvothermal method, and composite membranes containing 2.5 wt. %. MOF was fabricated. Experiments were conducted with pure hydrogen (H2) and reformate gas mixtures containing H2, carbon monoxide (CO), and carbon dioxide (CO2). A gas chromatography device (GC) was used to analyze the gas composition at the exit of the ECHP cell. The final output H2 purity was found to be >99.9 % for the H2/CO2/CO mixed-phase and >99.7% for the H2/CO mixed phase. © 2022 Proceedings of WHEC 2022 - 23rd World Hydrogen Energy Conference: Bridging Continents by H2. All rights reserved.
Optimization of modeling parameters of of a direct dimethyl ether fuel cell (DDMEFC)
(Institute of Electrical and Electronics Engineers Inc., 2019) Alpaydin,G.U.; Ozgur Colpan,C.; Devrim,Y.; Energy Systems Engineering; 06. School Of Engineering; 01. Atılım University
Direct alcohol fuel cells are one of the suitable candidates for sustainable power generation in portable applications. Among the different alcohol types that can be used in these fuel cells, DME, which is almost non-Toxic at room temperature and easy to liquefy, and has a molecular structure similar to methanol, is one of the suitable options. For this reason, many studies have been carried out to develop direct dimethyl ether fuel cell (DDMEFC). Mathematical modeling studies also play an important role in the development of DDMEFC since they enable the understanding of the performance of the fuel cells more thoroughly. In this study, a model has been developed by using the principles of conservation chemical species and electrochemistry. A modeling study was performed using MATLAB. The values of some modeling parameters were estimated using the genetic algorithm optimization technique. © 2019 University of Split, FESB.
PARAMETER OPTIMIZATION OF A PBI MEMBRANE-BASED HIGH TEMPERATURE-ELECTROCHEMICAL HYDROGEN COMPRESSOR FED WITH H2 AND CO MIXTURE
(International Association for Hydrogen Energy, IAHE, 2022) Kuzu,C.; Ozgur Colpan,C.; Durmuş,G.N.B.; Devrim,Y.; Mechanical Engineering; Energy Systems Engineering; 06. School Of Engineering; 01. Atılım University
In today's world, the increase in the amount of energy needed with the increase in the human population and the depletion of fossil fuels has pushed researchers to search for alternative fuels. Hydrogen is expected to take an important share among the alternative fuels in the future. However, it has some challenges in terms of its storage and pressurization. In this study, the effect of back diffusion on the performance of a PBI membrane-based electrochemical hydrogen compressor operating at 160 °C. Pressure values are calculated and validated with experimental results; and the change of flux, voltage and cell efficiency with time are presented. © 2022 Proceedings of WHEC 2022 - 23rd World Hydrogen Energy Conference: Bridging Continents by H2. All rights reserved.
Citation - Scopus: 1
Wind and Hybrid Power Systems: Reliability-Based Assessment
(Elsevier, 2023) Eryilmaz,S.; Devrim,Y.; Industrial Engineering; Energy Systems Engineering; 06. School Of Engineering; 01. Atılım University
Reliability evaluation has become more and more important in today’s engineering systems. Thus, a proper reliability index should be included in optimal design and decision-making processes. In this chapter, the reliability-based evaluation of wind and hybrid power systems is reviewed and new perspectives for further studies are presented. © 2023 Elsevier Inc. All rights reserved.