Large interlayer spacing NbCT (MXene) promotes the ultrasensitive electrochemical detection of Pb on glassy carbon electrodes.

A NbCT (MXene)-modified glassy carbon electrode was used for the electrochemical detection of Pb ions in aqueous media. The sensing platform was evaluated by anodic stripping analysis after optimizing the influencing factors such as pH, deposition potential, and time. The large interlayer spacing, high lattice parameter and higher conductivity of NbCT compared to other MXenes enhance the electrochemical detection of Pb. The developed sensor can reach a detection limit of 12 nM at a potential ∼-0.6 V. Additionally, the developed sensor showed promising selectivity in the presence of Cu and Cd, and stability for at least 5 cycles of continuous measurements with good repeatability. This work demonstrates the potential applications of NbCT towards the development of effective electrochemical sensors.