I am giving potential to my sample which is anodic region from -1000mV to 200mV, and i get a current response both having positive and negative sign..
I am confused about current flow, as per my understanding current need to flow in one direction as this potential range which i am applying is anodically active region. Then why current change its sign??
Plz help...
If you want help, dear s. N. , then:
1) show, at least, one full CV cycle, and
2) make clear, and describe, please, your cell.
Ioannis Samaras Dear Sir, I am doing linear sweep voltammetry in this potential range, in order to study dezinfication of my brass sample in three electrode set-up.. I applied this potential range because this is the active region of zinc to dissolve from brass surface. But the current response which I obtained is difficult for me to comprehend as I am applying the potential range which is the active region for zinc to dissolve but I am getting positive and negative current at the same time in my graph. What does it mean, I need explanation for it. Plz help if possible.
Since your LSV experiment has a potential window that goes from negative (-1V) to positive (+0.2V), it is likely that you will get a current that follows the same trend, so this is not unusual.
Dear s. N. ,
if this[1] was
(/supposed to be) an actual potential[2] range, then you should (have to) note, explicitly[2,3], here, in your reply, (what is/was) your (standard) reference electrode (RE).
1. X-axis (in your LSV: current vs pot.PNG)
2. The potential difference is measured between the WE and the RE (reference electrode), n e v e r between WE and CE. https://www.researchgate.net/post/How_do_we_measure_the_voltage_difference_between_working_and_counter_electrode_in_a_three_electrode_setup
3. In order to apply potential, we require some standard/reference electrode, whose potential is constant. https://www.researchgate.net/post/Why-to-use-a-three-electrode-system-in-electrochemical-cell-instead-of-two-electrodes
You may refer to the following article
Article An In-Depth Exploration of the Electrochemical Oxygen Reduct...
There I tried to document the very basic of how the LSV experiments. Although my work is in a different area, but LSV basics are the same. It should help beginners in this field of electrochemistry to get at least the idea of what actually happens in such systems.
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