Investigation of the degradation of different nickel anode types for alkaline fuel cells (AFCs)

Gülzow, Erich; Schulze, Mathias; Steinhilber, Gudrun

doi:10.1016/s0378-7753(01)01033-3

Cited by 42 publications

(17 citation statements)

References 42 publications

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“…The depth profile measurement shows that the surface of the electrode is covered by a PTFE film. Similar PTFE films were also found on AFC anodes produced by the same technique from a Raney-nickel catalyst and PTFE powder [4,15,16,36,37]. It could be demonstrated for these electrodes that the formation of the PTFE film on the surface is generated by the rolling step.…”

Section: Physical (Xps) Measurementssupporting

confidence: 63%

Preparation of Gas Diffusion Electrodes with Silver Catalysts for Alkaline Fuel Cells

2003

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In alkaline fuel cells (AFC) silver can be used as the cathode catalyst in gas diffusion electrodes. To prepare the gas diffusion electrodes, the metal catalyst was mixed with polytetraflourethylene (PTFE), as the organic binder, in a knife mill and rolled onto a metal web in a calender. The electrodes are manufactured as an endless tape with a thickness of approx. 0.4 mm and widths of up to 20 cm. Raney‐silver, carbon supported silver, or silver deposited as a closed film on PTFE are used as the catalyst. In the gas diffusion electrode preparation process the silver catalyst can be used in this oxidized form. Before using the gas diffusion silver cathodes in the alkaline fuel cell the catalyst will be reduced to the metallic form.

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Section: Physical (Xps) Measurementssupporting

confidence: 63%

Preparation of Gas Diffusion Electrodes with Silver Catalysts for Alkaline Fuel Cells

2003

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“…The DLR dry spraying technique [3,[5][6][7][8][9]] is a consequent further development of the manufacturing technique for alkaline fuel cell electrodes [4,[10][11][12][13][14][15][16], with a new deposition type of the powder mixture for the reaction layer. In both types of electrodes, commercial electrodes and the DLR electrodes, a carbon supported platinum catalyst is used.…”

Section: Sample-preparationmentioning

confidence: 99%

Combined electrochemical and surface analysis investigation of degradation processes in polymer electrolyte membrane fuel cells

Schulze

Wagner

Kaz

et al. 2007

Electrochimica Acta

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130

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“…Therefore, the degradation of fuel cell components is under increased investigation and mainly focused on PEFC [4][5][6][7][8][9][10]. Although for AFCs several studies of degradation processes exist [11][12][13], they are all focussed on the electrodes, because the electrolyte in AFCs can be easily exchanged. In the case of using the silver GDE in a complete AFC, the high solubility of silver can lead in certain circumstances to a transfer of silver to the anode and a resulting metal deposition associated with a decrease in activity of the anode.…”

Section: Introductionmentioning

confidence: 99%

Application of Electrochemical Impedance Spectroscopy for Fuel Cell Characterization: PEFC and Oxygen Reduction Reaction in Alkaline Solution

Wagner

Friedrich

2009

Fuel Cells

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The most common method used to characterise the electrochemical performance of fuel cells is the recording of current/voltage U(i) curves. Separation of electrochemical and ohmic contributions to the U(i) characteristics requires additional experimental techniques like electrochemical impedance spectroscopy (EIS). The application of EIS is an approach to determine parameters which have proved to be indispensable for the characterisation and development of all types of fuel cell electrodes and electrolyte electrode assemblies [1]. In addition to EIS semi‐empirical approaches based on simplified mathematical models can be used to fit experimental U(i) curves [2].By varying the operating conditions of the fuel cell and by the simulation of the measured EIS with an appropriate equivalent circuit, it is possible to split the cell impedance into electrode impedances and electrolyte resistance. Integration in the current density domain of the individual impedance elements enables the calculation of the individual overpotentials in the fuel cell (PEFC) and the assignment of voltage loss to the different processes. In case of using a three electrode cell configuration with a reference electrode, one can directly determine the corresponding overvoltage. For the evaluation of the measured impedance spectra the porous electrode model of Göhr [3] was used. This porous electrode model includes different impedance contributions like impedance of the interface porous layer/pore, interface porous layer/electrolyte, interface porous layer/bulk, impedance of the porous layer and impedance of the pores filled by electrolyte.

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Investigation of the degradation of different nickel anode types for alkaline fuel cells (AFCs)

Cited by 42 publications

References 42 publications

Preparation of Gas Diffusion Electrodes with Silver Catalysts for Alkaline Fuel Cells

Preparation of Gas Diffusion Electrodes with Silver Catalysts for Alkaline Fuel Cells

Combined electrochemical and surface analysis investigation of degradation processes in polymer electrolyte membrane fuel cells

Application of Electrochemical Impedance Spectroscopy for Fuel Cell Characterization: PEFC and Oxygen Reduction Reaction in Alkaline Solution

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