Abstract
High surface area carbons are used as electrocatalyst supports for noble metal particles in phosphoric acid fuel cells. Under operating conditions at high temperature (in excess of 200°C), the carbon support corrodes. An examination of the corrosion characteristics of various carbons as a function of electrode potential, acid temperature and carbon treatments is given. Since efficient catalyzation of the carbon requires small noble metal electrocatalyst particles, a high surface area carbon is required. The influence of heat treatment on commercial carbons shows a decrease in dispersion for the noble metals, although the heat treatment stabilizes the carbons against corrosive degradation. Correlations between the electrochemical properties of the carbons and the X-ray diffraction ( c 2 ) lattice parameters were observed.
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