In Situ and Operando Characterization of Proton Exchange Membrane Fuel Cells

Meyer, Quentin; Zeng, Yachao; Zhao, Chuan

doi:10.1002/adma.201901900

Cited by 134 publications

(92 citation statements)

References 180 publications

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“…Therefore, there is a rising demand for more efficient and sustainable energy conversion approaches. In this context, fuel cells, which allow the direct conversion of chemical energy into electrical energy, have been studied within the last few decades [2][3][4][5][6][7][8]. The most frequent type of fuel cells is the proton-exchange membrane fuel cell (PEMFC), in which protons are transported from the anode to the cathode through a proton-permeable membrane.…”

Section: Introductionmentioning

confidence: 99%

Humidity-Mediated Anisotropic Proton Conductivity through the 1D Channels of Co-MOF-74

et al. 2020

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Large Co-MOF-74 crystals of a few hundred micrometers were prepared by solvothermal synthesis, and their structure and morphology were characterized by scanning electron microscopy (SEM), IR, and Raman spectroscopy. The hydrothermal stability of the material up to 60 °C at 93% relative humidity was verified by temperature-dependent XRD. Proton conductivity was studied by impedance spectroscopy, using a single crystal. By varying the relative humidity (70–95%), temperature (21–60 °C), and orientation of the crystal relative to the electrical potential, it was found that proton conduction occurs predominantly through the linear, unidirectional (1D) micropore channels of Co-MOF-74, and that water molecules inside the channels are responsible for the proton mobility by a Grotthuss-type mechanism.

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Section: Introductionmentioning

confidence: 99%

Humidity-Mediated Anisotropic Proton Conductivity through the 1D Channels of Co-MOF-74

et al. 2020

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“…In PEM fuel cells, the GDL enables transport of reactant gases from flow channels to the CL, accompanied by draining the produced water at the CLs. [82,83,84,85,86] In addition, the GDL also needs to be a good electron conductor regarding current collection. There are various types of GDLs in development, however, in general they are made of porous carbon fiber and carbon particles.…”

Section: Effect Of Temperature On the Degradation Of The Gas Diffusiomentioning

confidence: 99%

Temperature Effects in Polymer Electrolyte Membrane Fuel Cells

et al. 2020

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The behavior of proton exchange membrane fuel cells (PEMFCs) strongly depends on the operational temperatures. In mobile applications, for instance in fuel cell electric vehicles, PEMFC stacks are often subjected to temperatures as low as −20 °C, especially during cold start periods, and to temperatures up to 120 °C during regular operation. Therefore, it is important to understand the impact of temperature on the performance and degradation of hydrogen fuel cells to ensure a stable system operation. To get a comprehensive understanding of the temperature effects in PEMFCs, this manuscript addresses and summarizes in‐ situ and ex‐ situ investigations of fuel cells operated at different temperatures. Initially, different measurement techniques for thermal monitoring are presented. Afterwards, the temperature effects related to the degradation and performance of main membrane electrode assembly components, namely gas diffusion layers, proton exchange membranes and catalyst layers, are analyzed.

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“…Nowadays, there is still a need for a solid understanding of how structural and electrochemical processes are affected during PEMFC operation. To this end, Meyer Q. and coworkers recently proposed a comprehensive roadmap for in situ and operando characterization of PEMFCs [89]. This roadmap is an answer to the present lack of knowledge of structure-to-electrochemical performance relationships during operation and tries to answer how these processes correlate to uneven degradation of different areas of the cell.…”

Section: Proton-exchange Membranes Fuel Cells (Pemfc)mentioning

confidence: 99%

Ionizing Radiation for Preparation and Functionalization of Membranes and Their Biomedical and Environmental Applications

Casimiro

Leal²,

Pereira

et al. 2019

Membranes

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The use of ionizing radiation processing technologies has proven to be one of the most versatile ways to prepare a wide range of membranes with specific tailored functionalities, thus enabling them to be used in a variety of industrial, environmental, and biological applications. The general principle of this clean and environmental friendly technique is the use of various types of commercially available high-energy radiation sources, like 60Co, X-ray, and electron beam to initiate energy-controlled processes of free-radical polymerization or copolymerization, leading to the production of functionalized, flexible, structured membranes or to the incorporation of functional groups within a matrix composed by a low-cost polymer film. The present manuscript describes the state of the art of using ionizing radiation for the preparation and functionalization of polymer-based membranes for biomedical and environmental applications.

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In Situ and Operando Characterization of Proton Exchange Membrane Fuel Cells

Cited by 134 publications

References 180 publications

Humidity-Mediated Anisotropic Proton Conductivity through the 1D Channels of Co-MOF-74

Humidity-Mediated Anisotropic Proton Conductivity through the 1D Channels of Co-MOF-74

Temperature Effects in Polymer Electrolyte Membrane Fuel Cells

Ionizing Radiation for Preparation and Functionalization of Membranes and Their Biomedical and Environmental Applications

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