You have to optimize your ink preparation according to you experimental requirement. For instance, 1 mg electrocatalyst is dispersed (via ultrasonication)in 1 mL of ethanol+water (1:1) mixture, then added 10 uL Nafion (as binder) and sonicated for 30 min. Your ink is ready to coat on GC.
The problem is while dropping the ink on GC it spreads out? how to overcome it.The GC has a dia of 0.3mm.
Use a microlitre syringe and take utmost precaution while dropcasting. Add the ink drop by drop on the electrode surface. Make sure that it doesn't spread outside.
Hi Asish,
Before dropcasting on GC, make sure that GC surface is completely dry. Take 5 uL ink and stepwise drop cast. Let it dry fast drop then add the next. I am sure you will overcome this.
you have to disperse the required amount of your catalysts ( depending on the loading amount you need) in dilute nafion solution in water alcohol mixture by ultrasonication. then load your ink on glassy carbon electrode by drop casting technique
In my opinion, 0.3 mm dia. is awfully small for dropcasting. Ca you use an ordinally sized gce? 0.3 mm is already too large to assume radial diffusion. if spilling out is the problem, use small droplets as suggested earlier and try not to worry about covering entire gce surface. Nafion (or other binders) is not needed for some metal oxides if the amount casted is small (probably up to several monolayers).
Can the acidity of the nafion interfere with the activity of the metal oxides?
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