Journal
RUSSIAN JOURNAL OF ELECTROCHEMISTRY
Volume 47, Issue 11, Pages 1268-1273Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S1023193511110115
Keywords
gas-diffusion electrode; wetting ability; impregnation; hydrophilic porosity; tetrabutylammonium bromide; double layer capacitance; oxygen reduction; acetylene carbon black
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Funding
- Russian Foundation for Basic Research-Sibir' [11-03-98000]
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A new method of fast impregnation of carbon black gas-diffusion hydrophobized electrodes is suggested under their cathodic polarization in an alkaline aqueous solution of tetrabutylammonium bromide (TBAB) at the potentials of hydrogen evolution. As dependent on the quantitative content of polytetrafluoroethylene (PTFE) in the electrode, current density, time, TBAB concentration, various degree of electrode wetting is observed, up to nearly complete electrode flooding in just several hours. When electrodes are stored, their original electrolyte porosity is not recovered. the electrode with 8 wt % of PTFE was used to show the effect of the electrode flooding degree on the double layer capacity, average diameter of electrolyte pores, their surface area and activity in the case of oxygen reduction. This method may be used for simulation of the process of flooding of gas-diffusion electrodes by electrolyte in the course of their prolonged operation.
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