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Ultrasonic-Assisted Synthesis of Layered Core-Shell Ni-MOF Derivatives for Enhanced Hydrogen Sensing
Bo Wang1, Minzhe Sun2, Zhenqian Cheng3
1School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.
Nanomaterials (Basel, Switzerland)
|July 27, 2026
Summary
Researchers developed advanced nickel-metal-organic framework (Ni-MOF) materials for hydrogen gas sensing. The layered Ni-MOF sensor shows enhanced sensitivity, selectivity, and durability for environmental monitoring and safety applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Hydrogen gas poses significant safety risks due to its flammability and low explosion limit.
- Accurate hydrogen sensing is crucial for environmental monitoring and industrial safety.
Purpose of the Study:
- To design and synthesize novel MOF-derived materials for high-performance hydrogen sensing.
- To investigate the structure-property relationships influencing hydrogen sensor performance.
Main Methods:
- Synthesis of layered and bulk Ni-MOF precursors.
- Pyrolysis of precursors to obtain Ni-Layer-Pyrolysis and Ni-Bulk-Pyrolysis materials.
- Structural characterization using techniques like electron microscopy and spectroscopy.
- Electrochemical impedance spectroscopy to evaluate charge transport properties.
- Gas-sensing tests to assess sensor performance (detection limit, sensitivity, selectivity, stability).
Main Results:
- Ni-Layer-Pyrolysis exhibited a layered morphology with a core-shell structure, higher graphitization, and more uniform active sites than Ni-Bulk-Pyrolysis.
- Electrochemical studies revealed lower charge-transfer resistance and higher carrier density in Ni-Layer-Pyrolysis.
- The Ni-Layer-Pyrolysis sensor achieved a low detection limit (100 ppm) and high sensitivity (6.24 at 8000 ppm H₂).
- Excellent selectivity against interfering gases and long-term stability (>40 days) were demonstrated.
Conclusions:
- The layered structure and core-shell architecture are critical for enhancing the sensitivity, selectivity, and durability of hydrogen sensors.
- MOF-derived nanostructures offer a promising platform for developing high-performance hydrogen sensors.
- This research provides valuable insights for designing advanced gas sensing materials.
