Porous composite electrodes platinum

M. Sogaard, M. Odgaard, and E. M. Skou, An Improved Method for the Determination of the Electrochemical Active Area of Porous Composite Platinum Electrodes, Solid State Ionics, Vol. 145, pp. 31-35, 2001. 

The investigations [40], using model fuel cells (Figure 2.5a), were started with iron oxides, magnesium ferrite (following Biefeld [41]) and composites of iron and alumina as electrodes and were continued mainly with thin porous layers of platinum, nickel and iron. Very soon it was seen that completely gastight solid electrolyte discs of highly pure substances had to be produced if the... 

The main focus of this year s effort has been on the deposition and characterization of platinum-ruthenium films of various compositions produced by co-sputtering of the individual elements. The effect of ruthenium deposited by reactive cosputtering has also been studied. The sputtering chamber was modified with a linear drive to be able to produce films on graphite foils, porous carbon structures, and on membranes. Thin films were deposited on graphite foil electrodes and characterized by XRD, XPS, SEM and polarization experiments. 

Figure 3.22. Plots of relative peak areas of the radical cation of the ferroceneboronate derivative of pinacol (m/z 312) as a function of the amount injected on-column (three lepUcate injections at each amount) using either the porous flow-through electrode emitter (O) or the platinum capillary electrode emitter (A). Derivative diluted in eluant and injected (1.0 pL) onto a 1.0-mm-i.d. X 15-cm-long PAH Hypersil column (S-pm particles, 120-A pore size). Eluant composition 80/20 (v/v) acetonitrile/water, 1.0 mM ammonium acetate, flow rate = 50 pL/min, SIM dwell time = 500 ms. PFT electrode emitter /tot 1.5 pA platinum capillary electrode emitter /tot 2.1 pA. (Adapted with permission from Ref. 52. Copyright 2004, Elsevier.)...

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