Pathways of diffusion mixed with subsequent reactions with examples of hydrogen extraction from hydride-forming electrode and oxygen reduction at gas diffusion electrode

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This paper covers the role of the rate-determining step (RDS) in anodic hydrogen extraction from hydride-forming electrode. In general, hydrogen extraction from the electrode proceeds through the following steps: (1) hydrogen diffusion within the electrode, (2) hydrogen transfer from absorbed state to adsorbed state, (3) electrochemical oxidation of hydrogen to hydrogen ion involving charge transfer, and (4) hydrogen ion conduction through the electrolyte. In most theoretical and experimental investigations, it has been assumed that the RDS of anodic hydrogen extraction is hydrogen diffusion through the electrode. In real situation, however, the overall rate of hydrogen extraction is simultaneously determined by the rates of two or more reaction steps including hydrogen diffusion. The present work provides the overview of anodic hydrogen extraction in case that diffusion is coupled with interfacial charge transfer, interfacial hydrogen transfer, and hydrogen ion conduction through the electrolyte as well as the purely diffusion-controlled hydrogen extraction. In addition, the mixed controlled diffusion model was also exemplified with oxygen reduction at gas diffusion electrode of fuel cell system.
Publisher
Springer
Issue Date
2011-12
Language
English
Article Type
Article
Keywords

ANODIC CURRENT TRANSIENT; PD FOIL ELECTRODE; ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; IMPERMEABLE BOUNDARY-CONDITIONS; GALVANOSTATIC DISCHARGE; SURFACE CONCENTRATION; COMPOSITE ELECTRODES; THEORETICAL-ANALYSIS; CATALYST LAYER; TRANSPORT

Citation

JOURNAL OF SOLID STATE ELECTROCHEMISTRY, v.15, no.11-12, pp.2437 - 2445

ISSN
1432-8488
URI
http://hdl.handle.net/10203/95925
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