There is a question about the catalytic activity test for the hydrogen evolution reaction.
For 3-electrode system, I used Pt wire as a counter electrode, Ag/AgCl as a reference electrode. And I made a working electrode by drop-casting Pt-based ink (with nafion) on the GCE .The electrolyte was 0.5 M aqueous solution of h2so4.
At first, I tried several cycles of CV test as cleaning the surface of electrode. Then, I tried LSV from 0 V to -1 V. After the overpotential voltage, while LSV scanning, I could find small bubbles on the working electrode and electrolyte became cloudy. It seems that there is a small particles as a suspension.
Do you know why the electrolyte become cloudy?
Any comments are welcome.
The hydrogen generated in the film forms bubbles, which tear apart the film. The small pieces of destroyed film make the solution claudy.
The hydrogen generated in the film forms bubbles, which tear apart the film. The small pieces of destroyed film make the solution claudy.
Thank you for your answers sir,
I also thought that the samples on the film formed a suspension. However, my sample is black, but the electrolyte turned slightly white. What do you think about this?
Any comments will be appreciated. Thank you.
Dimensional[1] control of particles and resulting changes in surface and electronic states, presents an opportunity to tailor particle surfaces to affect substrate interactions. Also, the pH[2], among other factors[3], might influence, at the nanoscale, the apparent visual colour (spectral weight redistribution).
1. Monodisperse platinum nanoparticles of well-defined shape:... http://www.cchem.berkeley.edu/pdygrp/pub_files/pubpdf/129.pdf
2. Understanding the pH-Dependent Behavior of Graphene Oxide Aqueous Solutions:... Article Understanding the pH-Dependent Behavior of Graphene Oxide Aq...
3. https://www.researchgate.net/post/Why_does_the_colour_of_gold_nanoparticles_change_from_gold_to_dark_violet_to_red
@Ioannis samaras
I totally understood sir. I really appreciate for your kind explanation. thank you for your help.
Best regards
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