Mixed potential type sensor based on Gd₂Zr₂O₇ solid electrolyte and BiVO₄ sensing electrode for effective detection...

Area of Science:

• Materials Science
• Chemical Sensing
• Environmental Technology

Background:

• Triethylamine (TEA) is a hazardous industrial chemical impacting human health and the environment.
• Portable, high-efficiency gas-sensing technology for TEA detection is critical for monitoring and safety.

Purpose of the Study:

• To develop a novel mixed potential type TEA sensor.
• To evaluate the sensor's performance for environmental and health monitoring applications.

Main Methods:

• Fabrication of a sensor using pyrochlore Gd2Zr2O7 solid-state electrolyte and BiVO4 sensing electrode.
• Testing sensor response to varying TEA concentrations (1-100 ppm) at 500°C.
• Analysis of response/recovery times, humidity resistance, reproducibility, and stability.

Main Results:

• The sensor exhibited significant response values to TEA, e.g., -134.4 mV at 100 ppm.
• A logarithmic linear relationship was observed between TEA concentration and sensor response (-50.8 mV/decade).
• The sensor demonstrated rapid response (10 s) and recovery (89 s) for 10 ppm TEA, alongside good stability and humidity resistance.

Conclusions:

• The developed Gd2Zr2O7/BiVO4 sensor shows high efficiency and sensitivity for TEA detection.
• The mixed potential sensing mechanism was confirmed, validating the sensor's performance.
• This technology holds significant application value for sensitive environmental TEA detection.