Ensuring the consistency of electrode structure in proton-exchange-membrane fuel cells is highly desired yet challenging because of wide-existing and unguided cracks in the microporous layer(MPL). The first thing is t...Ensuring the consistency of electrode structure in proton-exchange-membrane fuel cells is highly desired yet challenging because of wide-existing and unguided cracks in the microporous layer(MPL). The first thing is to evaluate the homogeneity of MPL with cracks quantitatively. This paper proposes the homogeneity index of a full-scale MPL with an area of 50 cm~2, which is yet to be reported in the literature to our knowledge. Besides, the effects of the carbon material and surfactant on the ink and resulting MPL structure have been studied. The ink with a high network development degree produces an MPL with low crack density, but the ink with high PDI produces an MPL with low crack homogeneity. The polarity of the surfactant and the non-polarity of polytetrafluoroethylene(PTFE) are not mutually soluble,resulting in the heterogeneous PTFE distribution. The findings of this study provide guidelines for MPL fabrication.展开更多
Proton-exchange-membrane fuel cells(PEMFCs)have the characteristics of zero emissions,a low operating temperature and high power density,and have great potential in improving energy-utilization efficiency.However,fuel...Proton-exchange-membrane fuel cells(PEMFCs)have the characteristics of zero emissions,a low operating temperature and high power density,and have great potential in improving energy-utilization efficiency.However,fuel cells are still quite expensive as a result of the cost of key components,including the membranes,catalysts and bipolar plates of PEMFCs.As a result of the cost and importance of these items,most researchers have focused on improving the lifetime and performance of fuel-cell stacks in recent years.In contrast,seals,sealants and adhesives play a more mundane role in the overall performance of a fuel cell,but failure of these materials can lead to reduced system efficiency,system failure and even safety issues.Little attention has been paid to the performance and durability of these products but as other fuel-cell components improve,these seals are becoming an even more critical link in the long-term performance of fuel cells.This article highlights the importance and background of fuel-cell seals.The latest research progress on the mechanical properties and structural optimization of different sealing materials is reviewed.展开更多
The structure and kinds of the fuel cell vehicle (FCV) and the mathematical model of the fuel cell processor are discussed in detail. FCV includes many parts: the fuel cell thermal and water management, fuel supply, a...The structure and kinds of the fuel cell vehicle (FCV) and the mathematical model of the fuel cell processor are discussed in detail. FCV includes many parts: the fuel cell thermal and water management, fuel supply, air supply and distribution, AC motor drive, main and auxiliary power management, and overall vehicle control system. So it requires different kinds of control strategies, such as the PID method, zero-pole method, optimal control method, fuzzy control and neural network control. Along with the progress of control method, the fuel cell vehicle's stability and reliability is up-and-up. Experiment results show FCV has high energy efficiency.展开更多
基金supported by China National Postdoctoral Program for Innovative Talents (BX20230121)China Postdoctoral Science Foundation (2023M741163)Shanghai Super Postdoctoral Incentive Program (2023741)。
文摘Ensuring the consistency of electrode structure in proton-exchange-membrane fuel cells is highly desired yet challenging because of wide-existing and unguided cracks in the microporous layer(MPL). The first thing is to evaluate the homogeneity of MPL with cracks quantitatively. This paper proposes the homogeneity index of a full-scale MPL with an area of 50 cm~2, which is yet to be reported in the literature to our knowledge. Besides, the effects of the carbon material and surfactant on the ink and resulting MPL structure have been studied. The ink with a high network development degree produces an MPL with low crack density, but the ink with high PDI produces an MPL with low crack homogeneity. The polarity of the surfactant and the non-polarity of polytetrafluoroethylene(PTFE) are not mutually soluble,resulting in the heterogeneous PTFE distribution. The findings of this study provide guidelines for MPL fabrication.
文摘Proton-exchange-membrane fuel cells(PEMFCs)have the characteristics of zero emissions,a low operating temperature and high power density,and have great potential in improving energy-utilization efficiency.However,fuel cells are still quite expensive as a result of the cost of key components,including the membranes,catalysts and bipolar plates of PEMFCs.As a result of the cost and importance of these items,most researchers have focused on improving the lifetime and performance of fuel-cell stacks in recent years.In contrast,seals,sealants and adhesives play a more mundane role in the overall performance of a fuel cell,but failure of these materials can lead to reduced system efficiency,system failure and even safety issues.Little attention has been paid to the performance and durability of these products but as other fuel-cell components improve,these seals are becoming an even more critical link in the long-term performance of fuel cells.This article highlights the importance and background of fuel-cell seals.The latest research progress on the mechanical properties and structural optimization of different sealing materials is reviewed.
文摘The structure and kinds of the fuel cell vehicle (FCV) and the mathematical model of the fuel cell processor are discussed in detail. FCV includes many parts: the fuel cell thermal and water management, fuel supply, air supply and distribution, AC motor drive, main and auxiliary power management, and overall vehicle control system. So it requires different kinds of control strategies, such as the PID method, zero-pole method, optimal control method, fuzzy control and neural network control. Along with the progress of control method, the fuel cell vehicle's stability and reliability is up-and-up. Experiment results show FCV has high energy efficiency.
