An electrochemical H₂S sensor based on the screen printing Fe@Pt/C/PTFE sensing electrode

Area of Science:

• Electrochemistry
• Materials Science
• Chemical Sensing

Background:

• Hydrogen sulfide (H2S) is a toxic gas requiring sensitive detection methods.
• Noble metal catalysts like platinum (Pt) are effective but expensive for H2S sensing.
• Developing cost-effective and highly sensitive H2S sensors is crucial for industrial safety.

Purpose of the Study:

• To develop a novel electrochemical gas sensor for sensitive H2S detection at room temperature.
• To utilize a Fe@Pt/C composite material to enhance catalytic performance and reduce costs.
• To optimize the sensor fabrication process for improved gas sensing performance.

Main Methods:

• Synthesis of a core-shell structured Fe@Pt catalyst using a two-step reduction method.
• Dispersion of the Fe@Pt catalyst in Vulcan XC-72 carbon for a composite material.
• Fabrication of the sensor electrode film using screen-printing technology on a PTFE substrate.
• Optimization of screen-printing parameters for enhanced gas sensing properties.
• Electrochemical detection of H2S at various concentrations.

Main Results:

• The Fe@Pt/C composite sensor demonstrated a linear response to H2S in the range of 1-20 ppm (R² = 0.99974).
• The sensor exhibited high sensitivity (658.45 nA ppm⁻¹) and a low detection limit (0.33 ppm).
• Satisfactory sensor consistency and stability were observed during H2S detection.

Conclusions:

• The novel Fe@Pt/C based electrochemical sensor offers a cost-effective and highly sensitive solution for H2S detection.
• The core-shell catalyst structure and optimized fabrication process contribute to superior sensing performance.
• The developed sensor is well-suited for practical industrial H2S monitoring applications.