I’m trying to identify the reduction peak of Ni²⁺ ions on either a nickel or copper working electrode using a three-electrode setup (Pt wire as the counter electrode and Ag/AgCl as the reference). I’ve tested two different solution compositions:
My linear sweep voltammetry (LSV) parameters are:
- Potential range: 0 V to –2 V (vs. Ag/AgCl)
- Scan rate: 50 mV/s
In both cases, the resulting LSV shows a nearly constant current of about 2.5 × 10⁻⁵ A from 0 to –0.7 V, followed by a sudden drop to around –2.5 × 10⁻⁵ A from –0.7 V down to –2 V. This creates a “Z-shaped” curve instead of producing a distinct reduction peak for Ni²⁺.
I would like to understand why this abrupt change in current (the “Z shape”) occurs and why I’m not observing a clear nickel reduction peak. Any insights or suggestions on improving the setup or parameters to obtain a well-defined nickel reduction peak would be greatly appreciated.
The order of magnitude of the current is too small, and it is suspected that the circuit is broken or the system impedance is too large.
I do electrochemical reactions with currents on the order of 10-3A but also with significant REDOX peaks. I am not in your research direction, but similar patterns have appeared in the test process, and later, the electrode holder was checked and the electrode was re-installed, and the test was solved.
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