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Catalysis

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.

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Related Experiment Video

Updated: Jun 9, 2025

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Published on: December 6, 2021

Palladium-Functionalized Nanostructured Nickel-Cobalt Oxide as Alternative Catalyst for Hydrogen Sensing Using

Olena Yurchenko¹, Mike Benkendorf¹, Patrick Diehle²

¹Fraunhofer Institute for Physical Measurement Techniques (IPM), 79110 Freiburg, Germany.

Nanomaterials (Basel, Switzerland)

|October 25, 2024

Summary

New palladium-functionalized nickel cobalt oxide catalysts offer enhanced hydrogen sensing. These catalysts show high sensitivity and stability below the lower flammability limit, with reduced humidity cross-sensitivity for safer applications.

Keywords:

hydrogen sensing metal oxide nanostructured catalyst pellistor

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Last Updated: Jun 9, 2025

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

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Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications

Published on: June 21, 2017

Area of Science:

Materials Science
Catalysis
Chemical Engineering

Background:

Development of advanced catalysts is crucial for sensitive hydrogen detection.
Noble metal catalysts are effective but costly, necessitating alternatives.
Nanostructured metal oxides offer tunable properties for catalytic applications.

Purpose of the Study:

To synthesize and evaluate a palladium-functionalized nanostructured Ni0.5Co2.5O4 catalyst for hydrogen sensing.
To investigate the effect of palladium loading and synthesis method on catalyst performance.
To assess the catalyst's sensitivity, stability, and cross-sensitivity to humidity.

Main Methods:

Coprecipitation synthesis of palladium-functionalized Ni0.5Co2.5O4.
Characterization using scanning transmission electron microscopy (STEM) and energy-dispersive X-ray (EDX).
Testing in planar pellistor sensors at 400 °C in dry and humid air.

Main Results:

Synthesized catalyst exhibited a sheet-like morphology with high palladium distribution.
Achieved a sensor response of 109 mV/10,000 ppm H2 (25% of LFL), a 4.6-fold increase over pristine Ni0.5Co2.5O4.
Demonstrated reduced humidity cross-sensitivity (~10%) compared to pristine Ni0.5Co2.5O4 (~27%).

Conclusions:

Palladium-functionalized Ni0.5Co2.5O4 shows high sensitivity and stability for hydrogen detection below LFL.
The catalyst's performance is attributed to strong metal-metal oxide interactions and high Pd dispersion.
Promising for developing next-generation hydrogen sensors with improved safety and reliability.