Could anyone help me to understand more about HER ? In many reports, ppl have done LSV to describe HER for their material. Could we get detail from CV curves or should do LSV?
Hi
LSV and CV are basically the same, you scan the potential in a linear way and measure the current. People often use CV since they like to start around 0 V and scan to one direction and than to the other (CV) to get the full window. in LSV you start at a point and scan only on way so unless you know exactly where to start a CV is a better option. Again there is no dramatic difference in reporting a potential window between a CV and LSV both are fine.
Hi,
To do HER, start from 0 V ( vs SCE) and scan towards negative direction. At a certain potential, you will see hydrogen gas evolution (current increases also) from the electrode surface and that is the potential window for the HER for your material.
Now, in between CV and LSV, later should be preferred for HER because only irreversible reduction of proton is of your interest, not the oxidation of hydrogen. Hence, LSV is enough to understand the HER system.
It is predicted an exponential growth in current vs voltage (V-VHER) near HER (VHER). So, It is proposed to scan with the opposite of sign rate (in LSV) upon one order increase in current.
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