Fig. 1: Proposed PEC-TDM system.

Schematic diagrams of a traditional TDM program and b PEC-TDM approach; c the block diagram of PEC-TDM system with micro-control unit, micro-electrochemical workstation, peristaltic pump, and battery; d digital photos of PEC-TDM device; e recognition mechanism of MTX on Fe₁-Zn₁-TiO₂ and corresponding detection of MTX.