A novel catalytic-type gas sensor based on alumina ceramic substrates loaded with catalysts and printed electrodes

Innovative Thermocatalytic H2 Sensor with Double-Sided Pd Nanocluster Films on an Ultrathin Mica Substrate

“…The sensing properties of various H 2 sensors are summarized in Table . ,,,− While the response time of metal oxide semiconductor gas sensors is typically on the order of several seconds, they require heating to very high temperatures. , Some thermochemical H 2 gas sensors exhibit a typical response time of ∼20 s. Many thermal catalytic H 2 sensors also have typical response and recovery times exceeding 10 s. Compared to these previously reported H 2 sensors, even at the operating temperature of 50 °C, our device demonstrates superior H 2 gas-sensing kinetics. To the best of our knowledge, our thermocatalytic H 2 sensor represents the current state-of-the-art in optimized comprehensive sensing capabilities in terms of response and recovery time, sensitivity, and manufacturing technology.…”

“…On the basis of this result, precise control over the device’s operating temperature can be achieved by manipulating the applied voltage. This control is crucial, especially in gas-sensing processes relying on chemical reactions, as the sensing performance is significantly influenced by temperature. ,,,− Moreover, maintaining a reasonable operating temperature is essential for achieving a harmonious balance between power consumption and device performance. To facilitate the assessment of the H 2 sensing performance of the devices at different operating temperatures, the change in temperature Δ T = T – T 0 is defined as the sensing response amplitude, where T is the temperature of the sensor exposed to H 2 , and T 0 is the operating temperature caused by the loading voltage in the absence of H 2 exposure.…”

“…For instance, applying catalyst paste onto the Pt heat electrode often results in electrode deformation, compromising sensor uniformity. 14 Moreover, catalytic layers fabricated through drop casting, owing to their macro-scale dimensions, pose limitations on device miniaturization and reproducibility, thereby impeding heterogeneous integration for portable applications due to increased power consumption. 11 Based on the outlined research background and identified challenges, we recognize the necessity to innovate existing thermocatalytic H 2 sensors from three primary perspectives.…”

“…However, these methods for integrating catalytic layers in thermocatalytic sensors exhibit significant drawbacks. For instance, applying catalyst paste onto the Pt heat electrode often results in electrode deformation, compromising sensor uniformity . Moreover, catalytic layers fabricated through drop casting, owing to their macro-scale dimensions, pose limitations on device miniaturization and reproducibility, thereby impeding heterogeneous integration for portable applications due to increased power consumption …”

Development of an Approach to Increase Hydrogen Measurement Selectivity

“…Many research groups are working to develop low-power catalytic hydrogen sensors with improved parameters by optimizing their design and manufacturing technology. (7,9,10) Note that catalytic hydrogen combustion is actively studied, since compared with conventional hydrogen-air combustion, it exhibits higher safety and efficiency and ultralow NOx emissions. (11,12) At the same time, the low-temperature catalytic combustion of hydrogen is known from the literature (13) and is even considered as a method of initiating the ignition of combustible hydrogen-hydrocarbon mixtures in internal combustion engines.…”