Abstract
Platinum was highly dispersed on acetylene black by the reduction of chloroplatinic acid with methyl alcohol containing sorbitan monolaurate. When the preparation concentration of sorbitan monolaurate was 5.0 g/liter and the heat‐treatment temperature to decompose the residual sorbitan monolaurate in the catalyst was 500°C, the electrode fabricated with this catalyst showed the highest performance for oxygen reduction in phosphoric acid at 190°C. The residual surface‐active agent was carbonized on heat‐treatment and the pore distribution of the catalyst was changed. The time dependence of the change in platinum particle diameter was measured at 0.80V vs. RHE in phosphoric acid at 205°C. The particle diameter hardly changed during a period of about 400h.
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