In this paper, a novel accelerated test method was proposed to analyze the durability of MEA, considering the actual operation of the fuel cell vehicle. The proposed method includes 7 working conditions： open circuit...In this paper, a novel accelerated test method was proposed to analyze the durability of MEA, considering the actual operation of the fuel cell vehicle. The proposed method includes 7 working conditions： open circuit voltage （OCV）, idling, rated output, overload, idling-rated cycle, idling-overload cycle, and OCV-idling cycle. The experimental results indicate that the proposed method can effectively destroy the MEA in a short time （165 h）. Moreover, the degradation mechanism of MEA was analyzed by measuring the polarization curve, CV, SEM and TEM. This paper may provide a new research direction for improving the durability of fuel cell.展开更多
Nowadays,the construction sector is more and more oriented toward the promotion of sustainability in all its activities.The goal to achieve is the optimization of performances,over the whole life-cycle,with respect to...Nowadays,the construction sector is more and more oriented toward the promotion of sustainability in all its activities.The goal to achieve is the optimization of performances,over the whole life-cycle,with respect to environmental,economic and social requirements.According to the latest advances,the concept of sustainability applied to constructions covers a number of branches such as life-cycle costing,ecology,durability and even structural design.Several procedures and design tools have been implemented in the framework of international research.Indeed the current trend in civil engineering research is moving towards life-time engineering,with the aim to implement integrated methodologies to consider as a whole all the sustainability requirements according to time-dependent multi-performance-based design approaches.Following a general introduction of the concept of sustainability applied to constructions,this paper presents an overview of life-time engineering methodologies according to the current state-of-the-art.In particular the methods currently received by International Standards are discussed.A special focus is devoted to the durability design of metal structures with respect to the degradation phenomena able to impair the structural capacity over time.Finally a proposal towards an integrated approach to life-time engineering design of steel structures and needs for further advances are presented.展开更多
文摘In this paper, a novel accelerated test method was proposed to analyze the durability of MEA, considering the actual operation of the fuel cell vehicle. The proposed method includes 7 working conditions： open circuit voltage （OCV）, idling, rated output, overload, idling-rated cycle, idling-overload cycle, and OCV-idling cycle. The experimental results indicate that the proposed method can effectively destroy the MEA in a short time （165 h）. Moreover, the degradation mechanism of MEA was analyzed by measuring the polarization curve, CV, SEM and TEM. This paper may provide a new research direction for improving the durability of fuel cell.
基金the support from the European Cooperation in the field of Scientific and Technical Research(COST)
文摘Nowadays,the construction sector is more and more oriented toward the promotion of sustainability in all its activities.The goal to achieve is the optimization of performances,over the whole life-cycle,with respect to environmental,economic and social requirements.According to the latest advances,the concept of sustainability applied to constructions covers a number of branches such as life-cycle costing,ecology,durability and even structural design.Several procedures and design tools have been implemented in the framework of international research.Indeed the current trend in civil engineering research is moving towards life-time engineering,with the aim to implement integrated methodologies to consider as a whole all the sustainability requirements according to time-dependent multi-performance-based design approaches.Following a general introduction of the concept of sustainability applied to constructions,this paper presents an overview of life-time engineering methodologies according to the current state-of-the-art.In particular the methods currently received by International Standards are discussed.A special focus is devoted to the durability design of metal structures with respect to the degradation phenomena able to impair the structural capacity over time.Finally a proposal towards an integrated approach to life-time engineering design of steel structures and needs for further advances are presented.
