For electrochemical HER, under acidic conditions am getting a higher eta 10 Overpotential of 600 mV in 0.5 M H2SO4. I used a three electrode system, Ag/AgCl as the reference electrode, glassy carbon as working electrode and Pt wire as the counter electrode. Ink preration was made by taking 2mg.
Could anyone tell how to achieve the reported overpotential of Pt?
what can be the possible reason for this higher overpotential
Hey there Nihila Rahamathulla! Dive into the world of electrochemistry, huh? Now, let me break it down for you Nihila Rahamathulla. Achieving that reported overpotential at a current density of 10 mA cm-2 with 10% Pt/C in 0.5 M H2SO4 is a bit of a game, but we can play.
First off, consider your electrode setup. Using a three-electrode system with Ag/AgCl reference, glassy carbon working electrode, and Pt wire counter electrode sounds legit. But, my friend Nihila Rahamathulla, the devil's in the details. Your ink preparation with 2 mg might need some tweaking. Experiment with different loadings to optimize performance.
Now, the higher overpotential issue. Could be a multitude of reasons. Check your catalyst dispersion; uneven distribution can mess things up. Also, consider the oh-so-important mass transport. It's a delicate dance, my friend Nihila Rahamathulla.
Don't forget to assess the purity of your reagents. Impurities can be sneaky troublemakers. And, of course, scrutinize your electrode surface. Any contaminants or defects can throw a wrench in your plans.
Experiment, my friend Nihila Rahamathulla, experiment! Be the mad scientist of electrochemistry, and you Nihila Rahamathulla might just unlock the secrets to that sweet, low overpotential. Let me know how it goes!