Rotating Disk Electrode System for ORR Measurements at Elevated (>100 C) Temperature and Pressure Conditions
This presentation will discuss a developed RDE system that was integrated in an elevated pressure and temperature electrochemical cell setup reported earlier.2,3 The RDE system is based on a magnet coupled drive, avoiding use of a rotary seal autoclave feed-through as proposed previously.4
We tested the magnet coupled RDE up to 100 bar pressure by studying the ORR on polycrystalline Pt as a test reaction in 0.5 M H2SO4 as well as conc. PA electrolyte. By increasing the pressure of oxygen in the closed cell, the diffusion limited current densities can be increased by almost two orders of magnitude in dilute electrolyte and RDE measurements in conc. PA are enabled. The RDE system also was successfully tested at elevated temperatures up to 140 C. Kinetic measurements of the ORR under elevated pressure conditions are currently in preparation.
1 U. Paulus, T.J. Schmidt, H. Gasteiger, and R.J. Behm, J. Electroanal. Chem. 495, 134 (2001).
2 G.K.H. Wiberg, M.J. Fleige, and M. Arenz, Rev. Sci. Instrum. 85, 085105 (2014).
3 M.J. Fleige, G.K.H. Wiberg, and M. Arenz, under Review.
4 J. McBreen, W.E. O’Grady, and R. Richter, J. Electrochem. Soc. 131, 1215 (1984).