“…In recent years, the electrochemical technology has aroused intense attention in the detection of Cd 2+ , which is characterized by high sensitivity, fast response, and low cost. − As for the developed electrochemical sensing method for Cd 2+ , there are generally two common patterns. , One is the traditional nanomaterial-based anodic stripping voltammetry technology (ASV), which involves two steps: electrodeposition and reoxidation. ,− For instance, Sun et al prepared a graphdiyne/graphene nanohybrid-modified electrode to achieve the ASV detection of Cd 2+ upon the electrodeposition of 300 s at 1.2 V, which enables Cd 2+ to be reduced to Cd 0 ; similarly, Guo and his colleagues prepared a Co-TIC4R-I electrode to achieve sensitive ASV detection of Cd 2+ after 300 s electrodeposition at −1.0 V. The other pattern is the biosensors by using various biorecognition elements and introducing electroactive probes (e.g., ferrocene and thionine). , For instance, Yuan’s group assembled a Pd@Cu@Pt/DNA-ferrocene-modified electrode for the electrochemical detection of Hg 2+ ; herein, the ferrocene molecule was adopted as an electroactive probe. There is no doubt that these electrochemical methods can achieve sensitive detection for Cd 2+ ; however, suitable electrode modification processes and modifiers are generally inevitable for these methods, which are relatively complex and easily pose negative effects on the sensing activity of materials, disturbing the sensitivity, stability, and reproducibility of the sensing assay; in addition, modifiers may fall off from the electrode surface easily.…”