A Direct Electrochemical H2S Sensor Based on Ti3C2Tx MXene

Abstract The layered structure of two‐dimensional transition metal carbon/nitride and its excellent physical and chemical properties make it a major research hotspot in the field of sensing. Meanwhile, characteristics such as good biocompatibility and hydrophilicity make this type of material a good potential biological sensing material. In this work, a graphene‐like structure composed of multilayer Ti 3 C 2 T x MXene was successfully synthesized by a simple hydrogen fluoride etching method, and an attempt was made to use it for non‐enzymatic H 2 S electrochemical sensing. The electrochemical test results show that the modified Ti 3 C 2 T x MXene/GCE has a high sensitivity (0.587 μA μM −1 cm −2 ) for the detection of trace H 2 S. At the same time, it shows a low detection limit (16.0 nM) and a wide detection range (100 nM–300 μM). The result provides a new research direction for H 2 S electrochemical sensing, as well as a new platform for MXene materials in biological sensing.