Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 20, Pages 23850-23858Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c02432
Keywords
molybdenum disulfide; molybdenum oxysulfide; electro-oxidation; trace water detection; electrochemical sensors
Funding
- National Natural Science Foundation of China [21675003, 21974003]
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The electro-oxidation mechanism of molybdenum disulfide nanomaterials and its application in the construction of ultrasensitive electrochemical sensor for the detection of trace water were investigated.
Molybdenum disulfide nanomaterials nowadays are very popular in electrocatalysis field due to their outstanding catalytic performance toward many electrochemical reactions. However, the electrochemical oxidation reaction of molybdenum disulfide nanomaterials in the range of positive potential has not been studied thoroughly. Herein, we have investigated electro-oxidation of molybdenum disulfide nanomaterials and put forward a new reaction mechanism: molybdenum disulfide nanomaterials are electro-oxidized with water to form molybdenum oxysulfide (MoOS2) and hydrogen ions, leading to the release of hydrogen on the counter electrode. Various characterization methods such as contact angle measurement, scanning electron microscope (SEM), transmission electron microscope (TEM) with energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), X-ray absorption near edge structure (XANES) spectroscopy, time-of-flight secondary ion mass spectrometry (ToF-SIMS), and gas chromatography (GC) were applied to attest the doping of oxygen and the generation of hydrogen. Based on this reaction, we constructed a novel ultrasensitive electrochemical sensor for detecting trace water with the minimum detectable content of 0.0010% (v/v) in various organic solvents and ionic liquids, which is comparable to the Karl Fischer titration, but with much simpler reagent.
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