Development of Composite Ceramic Membranes for Carbon Dioxide Detection

Area of Science:

• Materials Science
• Electrochemistry
• Chemical Sensing

Background:

• Development of advanced materials for gas sensing is crucial.
• Carbon dioxide (CO₂) sensing requires selective and responsive materials.
• Porous ceramic membranes offer potential for gas detection.

Purpose of the Study:

• To synthesize and evaluate porous La₂MoWO₉ (W-LAMOX) ceramic membranes impregnated with a lithium, sodium, and potassium carbonate (LNKC) eutectic mixture.
• To investigate the CO₂ sensing performance of these composite membranes.
• To compare the sensing characteristics of membranes prepared via different methods.

Main Methods:

• Synthesis of porous La₂MoWO₉ (W-LAMOX) composite membranes.
• Impregnation with a Li-Na-K carbonate (LNKC) eutectic mixture.
• Characterization using X-ray diffraction (XRD), scanning electron microscopy (SEM), and impedance spectroscopy.
• Evaluation of CO₂ sensing response and reproducibility.

Main Results:

• Sintered thinner membranes prepared by tape casting demonstrated superior performance.
• These thinner membranes exhibited faster and more reproducible responses to CO₂ exposure compared to thick pressed pellets.
• Structural, microstructural, and electrical properties were correlated with sensing behavior.

Conclusions:

• Porous W-LAMOX/LNKC composite membranes show promise for CO₂ sensing applications.
• Membrane thickness and preparation method significantly impact sensing performance.
• Tape-casted thinner membranes are advantageous for enhanced CO₂ detection.