It

End pI ate

Pt plate

Potent¡0-Galvanostat nsulation sheet

Fig.1. An apparatus for a corrosion test cell with ln-situ X-rav diffraction measurement.

Pt plate

Potent¡0-Galvanostat nsulation sheet

Fig.1. An apparatus for a corrosion test cell with ln-situ X-rav diffraction measurement.

percent Pt. A paste was prepared with the alloy-electrocatalysts and 100% H3PO-i. Tlie paste was sandwiched between thin carbon papers and mounted in the window side of the cell as a working electrode(WE). A conventional Hi-gas-diffusion electrode and a SiC matrix filled with h3po4 were employed as the counter electrode and the electrolyte layer, respectively. In-situ x-ray diffraction measurement was carried out to monitor the degradation level at the alloy-clectrocatalysts during the anodic polarization.

In order to evaluate the effect of temperature and potential on the corrosion of the alloy-electrocatalysts , the WE was polarized at a potential of 0.7 or 0.9 V in N2 atmosphere at elevated temperatures(200,240°C) for 48 hours. The humidity was controlled to keep the concentration of h3po4 constant at 100%.

0 0

Post a comment