The Experts below are selected from a list of 21570 Experts worldwide ranked by ideXlab platform

Paul K. Chu - One of the best experts on this subject based on the ideXlab platform.

  • Nitrogen plasma-implanted titanium as bipolar plates in Polymer Electrolyte Membrane fuel cells
    Journal of Power Sources, 2010
    Co-Authors: Kai Feng, Xun Cai, Dongan Liu, Dixon T K Kwok, Zhuguo Li, Paul K. Chu
    Abstract:

    Nitrogen plasma immersion ion implantation (PIII), a non-line-of-sight surface treatment technique suitable for bipolar plates in Polymer Electrolyte Membrane fuel cells, is conducted at low and high temperature to improve the corrosion resistance and conductivity of titanium sheets. X-ray photoelectron spectroscopy (XPS) shows that high-temperature (HT) nitrogen PIII produces a thick oxy-nitride layer on the titanium surface. This layer which provides good corrosion resistance and high electrical conductivity as verified by electrochemical tests, inductively coupled plasma optical emission spectroscopy, and interfacial contact resistance (ICR) measurements renders the materials suitable for Polymer Electrolyte Membrane fuel cells. In comparison, the low-temperature (LT) PIII titanium sample exhibits poorer corrosion resistance and electrical conductivity than the untreated titanium control. © 2010 Elsevier B.V. All rights reserved.

J. J. Baschuk - One of the best experts on this subject based on the ideXlab platform.

  • modelling of Polymer Electrolyte Membrane fuel cells with variable degrees of water flooding
    Journal of Power Sources, 2000
    Co-Authors: J. J. Baschuk, Xianguo Li
    Abstract:

    Abstract Polymer Electrolyte Membrane (PEM) fuel cells have received increasing attention from both the public and fuel cell community due to their great potential for transport applications. The phenomenon of water flooding in the PEM fuel cells is not well understood, and few modelling studies have included the effect of water flooding. On the other hand, water management is one of the critical issues to be resolved in the design and operation of PEM fuel cells. In the present study, a mathematical model has been formulated for the performance and operation of a single Polymer Electrolyte Membrane fuel cell. This model incorporates all the essential fundamental physical and electrochemical processes occurring in the Membrane Electrolyte, cathode catalyst layer, electrode backing and flow channel. A special feature of the model is that it includes the effect of variable degree of water flooding in the cathode catalyst layer and/or cathode electrode backing region on the cell performance. The model predictions have been compared with the existing experimental results available in the literature and excellent agreement has been demonstrated between the model results and the measured data for the cell polarisation curves. Hence, this model can be used for the optimisation of PEM fuel cell design and operation, and can serve as a building block for the modelling and understanding of PEM fuel cell stacks and systems.

  • Modelling of Polymer Electrolyte Membrane fuel cells with variable degrees of water flooding
    Journal of Power Sources, 2000
    Co-Authors: J. J. Baschuk, X. H. Li
    Abstract:

    Polymer Electrolyte Membrane (PEM) fuel cells have received increasing attention from both the public and fuel cell community due to their great potential for transport applications. The phenomenon of water flooding in the PEM fuel cells is not well understood, and few modelling studies have included the effect of water flooding. On the other hand, water management is one of the critical issues to be resolved in the design and operation of PEM fuel cells. in the present study, a mathematical model has been formulated for the performance and operation of a single Polymer Electrolyte Membrane fuel cell. This model incorporates all the essential fundamental physical and electrochemical processes occurring in the Membrane Electrolyte, cathode catalyst layer, electrode backing and flow channel. A special feature of the model is that it includes the effect of variable degree of water flooding in the cathode catalyst layer and/or cathode electrode backing region on the cell performance. The model predictions have been compared with the existing experimental results available in the literature and excellent agreement has been demonstrated between the model results and the measured data for the cell polarisation curves. Hence, this model can be used for the optimisation of PEM fuel cell design and operation, and can serve as a building block for the modelling and understanding of PEM fuel cell stacks and systems. (C) 2000 Elsevier Science S.A. All rights reserved.

D P Davies - One of the best experts on this subject based on the ideXlab platform.

Kai Feng - One of the best experts on this subject based on the ideXlab platform.

  • Nitrogen plasma-implanted titanium as bipolar plates in Polymer Electrolyte Membrane fuel cells
    Journal of Power Sources, 2010
    Co-Authors: Kai Feng, Dixon T K Kwok, Zhuguo Li
    Abstract:

    Nitrogen plasma immersion ion implantation (PIII), a non-line-of-sight surface treatment technique suitable for bipolar plates in Polymer Electrolyte Membrane fuel cells, is conducted at low and high temperature to improve the corrosion resistance and conductivity of titanium sheets. X-ray photoelectron spectroscopy (XPS) shows that high-temperature (HT) nitrogen PIII produces a thick oxy-nitride layer on the titanium surface. This layer which provides good corrosion resistance and high electrical conductivity as verified by electrochemical tests, inductively coupled plasma optical emission spectroscopy, and interfacial contact resistance (ICR) measurements renders the materials suitable for Polymer Electrolyte Membrane fuel cells. In comparison, the low-temperature (LT) PIII titanium sample exhibits poorer corrosion resistance and electrical conductivity than the untreated titanium control.

  • Nitrogen plasma-implanted titanium as bipolar plates in Polymer Electrolyte Membrane fuel cells
    Journal of Power Sources, 2010
    Co-Authors: Kai Feng, Xun Cai, Dongan Liu, Dixon T K Kwok, Zhuguo Li, Paul K. Chu
    Abstract:

    Nitrogen plasma immersion ion implantation (PIII), a non-line-of-sight surface treatment technique suitable for bipolar plates in Polymer Electrolyte Membrane fuel cells, is conducted at low and high temperature to improve the corrosion resistance and conductivity of titanium sheets. X-ray photoelectron spectroscopy (XPS) shows that high-temperature (HT) nitrogen PIII produces a thick oxy-nitride layer on the titanium surface. This layer which provides good corrosion resistance and high electrical conductivity as verified by electrochemical tests, inductively coupled plasma optical emission spectroscopy, and interfacial contact resistance (ICR) measurements renders the materials suitable for Polymer Electrolyte Membrane fuel cells. In comparison, the low-temperature (LT) PIII titanium sample exhibits poorer corrosion resistance and electrical conductivity than the untreated titanium control. © 2010 Elsevier B.V. All rights reserved.

X. H. Li - One of the best experts on this subject based on the ideXlab platform.

  • Modelling of Polymer Electrolyte Membrane fuel cells with variable degrees of water flooding
    Journal of Power Sources, 2000
    Co-Authors: J. J. Baschuk, X. H. Li
    Abstract:

    Polymer Electrolyte Membrane (PEM) fuel cells have received increasing attention from both the public and fuel cell community due to their great potential for transport applications. The phenomenon of water flooding in the PEM fuel cells is not well understood, and few modelling studies have included the effect of water flooding. On the other hand, water management is one of the critical issues to be resolved in the design and operation of PEM fuel cells. in the present study, a mathematical model has been formulated for the performance and operation of a single Polymer Electrolyte Membrane fuel cell. This model incorporates all the essential fundamental physical and electrochemical processes occurring in the Membrane Electrolyte, cathode catalyst layer, electrode backing and flow channel. A special feature of the model is that it includes the effect of variable degree of water flooding in the cathode catalyst layer and/or cathode electrode backing region on the cell performance. The model predictions have been compared with the existing experimental results available in the literature and excellent agreement has been demonstrated between the model results and the measured data for the cell polarisation curves. Hence, this model can be used for the optimisation of PEM fuel cell design and operation, and can serve as a building block for the modelling and understanding of PEM fuel cell stacks and systems. (C) 2000 Elsevier Science S.A. All rights reserved.