I want to do half cell experiment for pemfc.The surface area of glassy carbon is 0.196cm2 . For coating the electrode, I made slurry with Pt/C 0.01 gm(where pt 40wt% and C 60wt%), solvent 1mL and Nafion 2microliter. Per cm of the area of the electrode, I need 20microgram of platinum. So how much slurry do I need? Is there any equation? I can't find out the calculation .
THanks in advance
Have you considered diluting your slurry enough to pipette onto your electrode? This way, you could neglect the volume of the Pt/C and calculate the grams of Pt per ml solution and pipette out the correct volume to have 20 micrograms of Pt.
Otherwise, you can find the density of your solvent in g/l and use that to estimate the mass of Pt per total mass of slurry and try to use a spatula to weigh out the correct mass of slurry that contains 20 micrograms of Pt. The problem here is that your solvent will likely be evaporating while you try to spatula out the correct mass of slurry, which will make the grams of Pt per grams slurry variable.
Using more solvent so that you can pipette the correct volume onto your electrode makes it easier to control the amount of Pt on your electrode. Best of luck!
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