Dear All

I study ethanol electrooxidation on Pd, which is supported on carbon using cyclic voltammetry.I prepare the working electrode by adding 5mg of powder to 33µL Nation and 467µL of ethanol followed by 20 min sonication.Then I add 20µL (200µg powder) of the ink into the glassy carbon electrode surface.Problem is some of the ink get dried on the ceramic outside surface of glassy carbon.I can not control or accuartely define how much of the slurry has dried on the glassy carbon and how much was dried on the ceramic surface.That is why I am obtaining non-reproducible CV results every electrode experiment I run.I use the same electrolyte concentration, scan rate, reference electrode, and same area of working electrode. The only different thing is the working electrode, which is from the same material ink. Theoretically, it should give identical or very similar CV results.