If you are using screen printed electrodes, either made inhouse or from a third party you may find peaks near 0 V when you run a cyclic voltammogram. What you are seeing is the spillage/contamination of the working electrode by the ink/paste used to make your reference electrode.
If you have data that looks like that in the adjacent image then please contact Zimmer and Peacock for an explanation and a fix.
![](https://image.jimcdn.com/app/cms/image/transf/dimension=470x10000:format=png/path/s46c23316fd696b31/image/i457f84e1ed579563/version/1529065751/image.png)