A novel electrochemical sensor with NiSx@MoS2 composite for efficient NO2- sensing

Area of Science:

• Materials Science
• Electrochemistry
• Analytical Chemistry

Background:

• Excess nitrite (NO2-) poses significant risks to human health.
• Accurate and sensitive detection methods are urgently needed for early warning and public health protection.
• Electrochemical sensors offer a promising platform for rapid and reliable analyte detection.

Purpose of the Study:

• To develop a highly sensitive electrochemical sensor for nitrite detection.
• To synthesize and characterize a novel NiSx@MoS2 composite material for enhanced sensor performance.
• To evaluate the sensor's performance in terms of detection range, limit of detection, specificity, and stability.

Main Methods:

• Synthesis of NiSx@MoS2 composite material.
• Fabrication of an electrochemical sensor using the synthesized composite.
• Electrochemical characterization and performance evaluation for nitrite detection.
• Testing the sensor with real food samples to assess practical applicability.

Main Results:

• The NiSx@MoS2 composite exhibited excellent electrochemical activity.
• The developed electrochemical sensor demonstrated a wide detection range (0.0001-0.0020 mg/mL) and a low detection limit (1.863*10^-5 mg/mL) for nitrite.
• The sensor showed high specificity against common interfering substances and accurate detection in real food samples.
• Satisfactory repeatability and stability were observed, indicating good sensor performance.

Conclusions:

• The NiSx@MoS2 composite is a highly effective material for sensitive electrochemical nitrite detection.
• This electrochemical sensor shows great potential for practical applications in food safety and dietary guidance.
• The developed sensor offers a reliable method for early hazard warning and public health safeguarding.