Mass-transfer study of the carbon felt electrode

✍ Scribed by N. Vatistas; P.F. Marconi; M. Bartolozzi

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 914 KB
• Volume: 36
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(91)85259-a

✦ Synopsis

a specific surface area (m-l) %El specific surface area obtained by BET method (m-l) B =(I + J1+4D')/2 c concentration of electroactive species (mol 1-l) c, output concentration of electroactive species (mol I-') CO input concentration of electroactive species (mol I-') D diffusion coefficient (m2 s-') D' =cak,E/u2 E dispersion coefficient (m2 s-') F Faraday constant (96,486 C equivalent-') 1, limiting current (A) ;: limiting current density (A mT2) k: mass-transfer coefficient in plug-flow model (m s-') mass-transfer coefficient in axial dispersion model (m s-') L electrode length (m) Pe Peclet number relative to felt as a porous material = u/aD Pe, Peclet number relative to a single fibre = ud/D Re Reynolds number relative to felt as a porous material = u/av Re,, Reynolds number relative to a single fibre = ud/v S cross-section of electrode (m2) S, fibre surface (m2) Sh Sherwood number relative to felt as a porous material = ck,/aD Sh, Sherwood number relative to a single fibre = k,,d/D u flow velocity of electrolyte (m s-') Vb bed volume (m3) ,' distance from electrode entrance (m)