Focusing on the stack performance is important for practical use of PEM （proton exchange membrane） fuel cells. This paper describes the experiments and evaluation on the performance of 1-kW class PEM FC （fuel cell...Focusing on the stack performance is important for practical use of PEM （proton exchange membrane） fuel cells. This paper describes the experiments and evaluation on the performance of 1-kW class PEM FC （fuel cell） stacks for reliability improvement. We investigated the stack performance, voltage distributions, and internal resistance of the single cells of a PEMFC stack. The standard deviation of individual cell voltages increased almost linearly with the current load by 2.5 times that in the case of an open-circuit voltage, with a standard deviation of 33 A. From the results of the current-interrupt tests, the internal resistance of the FC stack was calculated to be 43.53 mΩ. The internal resistances of each individual cell were not uniform. The average internal resistance was 0.505 mΩ at 18 A, which was less than that calculated from the stack current-interrupt test. We also investigated the current distribution in the PEM FC stack under in-situ conditions using a triaxial magnetic sensor probe. From the results, the current distribution tended to concentrate on the underside of the cell. Each I-V curve at the divided plane can be obtained using the developed method.展开更多
The aim of this paper is the evaluation of the performance of a low pressure PEM （proton exchange membrane） fuel cell stack to step load changes, which are characteristic of standalone fuel cell system applications....The aim of this paper is the evaluation of the performance of a low pressure PEM （proton exchange membrane） fuel cell stack to step load changes, which are characteristic of standalone fuel cell system applications. The goal is a better understanding of the electrical behavior of the FC （fuel cell）, as a result of the electrochemical processes, via the cell＇s voltage characteristic during transient response. While changing the load, the performance of significant parameters affected such as temperature, pressure, purge status etc. are registered and evaluated. The analysis and experiment are based on a low pressure 1.2 kW PEM fuel cell stack （NEXAS power module）. Then, the experiment is simulated using Matlab/Simulink tools, while PCU （power conditioning units） are added in order to control power flow for enhanced performance. Finally, both operational and simulation data are compared to each other showing that simple PCUs applications can improve system＇s efficiency.展开更多
1 Results The effects of different operating parameters on micro proton exchange membrane (PEM) fuel cell performance were experimentally studied for three different flow field configurations (interdigitated,mesh,and ...1 Results The effects of different operating parameters on micro proton exchange membrane (PEM) fuel cell performance were experimentally studied for three different flow field configurations (interdigitated,mesh,and serpentine).Experiments with different cell operating temperatures and different backpressures on the H2 flow channels,as well as various combinations of these parameters,have been conducted for three different flow geometries.The micro PEM fuel cells were designed and fabricated in-house t...展开更多
Green hydrogen produced from wind,solar or hydro power is a suitable electricity storage medium.Hydrogen is typically employed as mid-to long-term energy storage,whereas batteries cover short-term energy storage.Green...Green hydrogen produced from wind,solar or hydro power is a suitable electricity storage medium.Hydrogen is typically employed as mid-to long-term energy storage,whereas batteries cover short-term energy storage.Green hydrogen can be produced by any available electrolyser technology[alkaline electrolysis cell(AEC),polymer electrolyte membrane(PEM),anion exchange membrane(AEM),solid oxide electrolysis cell(SOEC)]if the electrolysis is fed by renewable electricity.If the electrolysis operates under elevated pressure,the simplest way to store the gaseous hydrogen is to feed it directly into an ordinary pressure vessel without any external compression.The most efficient way to generate electricity from hydrogen is by utilizing a fuel cell.PEM fuel cells seem to be the most favourable way to do so.To increase the capacity factor of fuel cells and electrolysers,both functionalities can be integrated into one device by using the same stack.Within this article,different reversible technologies as well as their advantages and readiness levels are presented,and their potential limitations are also discussed.展开更多
文摘Focusing on the stack performance is important for practical use of PEM （proton exchange membrane） fuel cells. This paper describes the experiments and evaluation on the performance of 1-kW class PEM FC （fuel cell） stacks for reliability improvement. We investigated the stack performance, voltage distributions, and internal resistance of the single cells of a PEMFC stack. The standard deviation of individual cell voltages increased almost linearly with the current load by 2.5 times that in the case of an open-circuit voltage, with a standard deviation of 33 A. From the results of the current-interrupt tests, the internal resistance of the FC stack was calculated to be 43.53 mΩ. The internal resistances of each individual cell were not uniform. The average internal resistance was 0.505 mΩ at 18 A, which was less than that calculated from the stack current-interrupt test. We also investigated the current distribution in the PEM FC stack under in-situ conditions using a triaxial magnetic sensor probe. From the results, the current distribution tended to concentrate on the underside of the cell. Each I-V curve at the divided plane can be obtained using the developed method.
文摘The aim of this paper is the evaluation of the performance of a low pressure PEM （proton exchange membrane） fuel cell stack to step load changes, which are characteristic of standalone fuel cell system applications. The goal is a better understanding of the electrical behavior of the FC （fuel cell）, as a result of the electrochemical processes, via the cell＇s voltage characteristic during transient response. While changing the load, the performance of significant parameters affected such as temperature, pressure, purge status etc. are registered and evaluated. The analysis and experiment are based on a low pressure 1.2 kW PEM fuel cell stack （NEXAS power module）. Then, the experiment is simulated using Matlab/Simulink tools, while PCU （power conditioning units） are added in order to control power flow for enhanced performance. Finally, both operational and simulation data are compared to each other showing that simple PCUs applications can improve system＇s efficiency.
文摘1 Results The effects of different operating parameters on micro proton exchange membrane (PEM) fuel cell performance were experimentally studied for three different flow field configurations (interdigitated,mesh,and serpentine).Experiments with different cell operating temperatures and different backpressures on the H2 flow channels,as well as various combinations of these parameters,have been conducted for three different flow geometries.The micro PEM fuel cells were designed and fabricated in-house t...
文摘Green hydrogen produced from wind,solar or hydro power is a suitable electricity storage medium.Hydrogen is typically employed as mid-to long-term energy storage,whereas batteries cover short-term energy storage.Green hydrogen can be produced by any available electrolyser technology[alkaline electrolysis cell(AEC),polymer electrolyte membrane(PEM),anion exchange membrane(AEM),solid oxide electrolysis cell(SOEC)]if the electrolysis is fed by renewable electricity.If the electrolysis operates under elevated pressure,the simplest way to store the gaseous hydrogen is to feed it directly into an ordinary pressure vessel without any external compression.The most efficient way to generate electricity from hydrogen is by utilizing a fuel cell.PEM fuel cells seem to be the most favourable way to do so.To increase the capacity factor of fuel cells and electrolysers,both functionalities can be integrated into one device by using the same stack.Within this article,different reversible technologies as well as their advantages and readiness levels are presented,and their potential limitations are also discussed.
