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Title
ELECTROCHEMICAL REDUCTION OF OXYGEN AT ELECTROCOATED NAFION-MODIFIED METAL-CARBON COMPOSITE AND PLATINUM-ELECTRODES
Author:
SWAIN GM; TATARCHUK BJ;
Addresses:
TOHOKU UNIV,FAC ENGN,DEPT ENGN SCI SENDAI MIYAGI 980 JAPAN AUBURN UNIV,DEPT CHEM ENGN AUBURN AL 36849 AUBURN UNIV,INST SPACE POWER AUBURN AL 36849
Heading Title:
Journal of the Electrochemical Society
issue: 4, volume: 140, year: 1993,
pages: 1026 - 1033
SICI:
0013-4651(1993)140:4<1026:EROOAE>2.0.ZU;2-R
Source:
ISI
Language:
ENG
Subject:
ELECTROGENERATED CHEMI-LUMINESCENCE; PYROLYTIC-GRAPHITE; FIBER PRECURSORS; PHOSPHORIC-ACID; KINETICS; FILM; HETEROGENEITY;
Document Type:
Article
Nature:
Serial
Citations:
31
Reviewed:
Addresses for extracts:
Citation:
G.M. Swain and B.J. Tatarchuk, "ELECTROCHEMICAL REDUCTION OF OXYGEN AT ELECTROCOATED NAFION-MODIFIED METAL-CARBON COMPOSITE AND PLATINUM-ELECTRODES", Journal of the Electrochemical Society, 140(4), 1993, pp. 1026-1033

Abstract

The use of a newly developed stainless steel-carbon composite electrode designed for energy storage device applications is introduced. An experimental comparison of the electrochemical properties of 'electrocoated'' cast (SC) Nation film modified electrodes is described. Specifically, the oxygen reduction reaction (ORR) at bare and Nation-modifiedstainless steel-carbon composite electrodes in 0.1 M NaOH and at barean platinum disk electrodes in 0.7 M H3PO4 using cyclic voltammetry, chronoamperometry, an ac impedance analysis. The reduction currents, reduction current enhancement factors, Tafel slopes, and exchange current densities observed at the Nation-modified electrodes are compared with the values observed at the bare electrodes in the same solution. The EC film electrodes show improved electrode kinetics compared with the SC film electrodes based on the anodic shift of the reduction current E(p/2) values. In addition, the EC film electrodes exhibit larger peak of limiting current densities per unit weight Of Nation. The increased kinetics and larger reduction currents result from a higher concentration of oxygen available at the electrode surface due to an increased interfacial contact area between the polymer and the electrode surface provided by the electrocoating method. Contact resistance betweenthe polymer and the electrode surface may be reduced at EC film electrodes leading to less ohmic loss.

ASDD Area Sistemi Dipartimentali e Documentali, Bologna University, Review Catalogue
Document created on 23/01/21 at 07:11:32