Rapid Determination of Mercury Ions in Environmental Water Based on an N-Rich Covalent Organic Framework Potential Sensor

Figure 4

Electrochemical characteristic curves measured with impedance spectroscopy (a) and cyclic voltammetry (b) for bare GPE (A), GPE/COFTFPB-TZT (B), and GPE/COF_TFPB-TZT/Hg²⁺ (C) in a media solution containing 2.0 mmol/L K₃Fe (CN)₆ and 0.2 mol/L Na₂SO₄.

(a)

(b)