Steady state experimental evaluation of a novel Raney-nickel/PTFE gas diffusion electrode in an alka...

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" Steady state experimental evaluation of a novel Raney-nickel/PTFE gas diffusion electrode in an alkaline fuel cell "
K. A. A. Khan

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	1113162
Doc. No	:	TLpq230726771
Main Entry	:	K. A. A. Khan
Title & Author	:	Steady state experimental evaluation of a novel Raney-nickel/PTFE gas diffusion electrode in an alkaline fuel cell\ K. A. A. Khan
College	:	King Fahd University of Petroleum and Minerals (Saudi Arabia)
Date	:	1993
student score	:	1993
Degree	:	M.S.
Page No	:	140
Abstract	:	Steady state polarization measurements on specially prepared Raney-Ni/PTFE gas diffusion electrode impregnated with copper oxide were carried out. Pure hydrogen gas was fed to the half cell at a pressure of 1.4 bar. The electrolyte temperature was varied from 25C to 75C. The better performance (less polarization) at higher current densities is attributed to the addition of copper to the electrode. The spherical Raney-catalyst grain model was applied to determine the kinetic parameters, exchange current density (io) and charge transfer coefficient(usd\alphausd) for the electrode. Exchange current density followed an exponential relation with temperature. Apparent activation energy for the electrode was found to be 28 kJ/mol lower than that reported in the literature. Long term performance tests showed that electrode overpotential greater than 50 mV cause rapid deactivation of the electrode. The apparent deactivation constants estimated for the electrode varied from 0.004 hr to 0.032 hr. The rate of deactivation is more at higher temperatures. (Abstract shortened by UMI.)
Subject	:	Applied sciences
	:	Chemical engineering