A Direct Electrochemical H2S Sensor Based on Ti3C2Tx MXene

• Published in: ChemElectroChem Vol. 8; no. 19; pp. 3658 - 3665
• Main Authors: Liu, Xinran, He, Liang, Li, Ping, Li, Xinqi, Zhang, Pandong
• Format: Journal Article
• Language: English
• Published: Weinheim John Wiley & Sons, Inc 01.10.2021
• Subjects: Biocompatibility; biological sensors; Chemical properties; electrochemistry; Graphene; Hydrogen fluoride; Hydrogen sulfide; Multilayers; MXene; MXenes; Ti3C2Tx; Transition metals
• ISSN: 2196-0216; 2196-0216
• DOI: 10.1002/celc.202100964

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 Ti3C2Tx MXene was successfully synthesized by a simple hydrogen fluoride etching method, and an attempt was made to use it for non‐enzymatic H2S electrochemical sensing. The electrochemical test results show that the modified Ti3C2Tx MXene/GCE has a high sensitivity (0.587 μA μM−1 cm−2) for the detection of trace H2S. 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 H2S electrochemical sensing, as well as a new platform for MXene materials in biological sensing. A multilayer Ti3C2Tx MXene is prepared by a hydrofluoric acid etching method for electrochemical H2S sensing. Assembled with a glassy carbon electrode to form a sensing element, this material exhibits a low detection limit and a high sensitivity for hydrogen sulfide electrochemical sensing. The results are unaffected by testing in complex serum samples.