The study examines the effect of using low nickel (Ni) with high ceria (CeO2) anode content towards the oxidation of H2 and CH4 fuel by evaluating the activation energy of the ohmic process and charge transfer process. Using a micro-tubular solid oxide fuel cell (MT-SOFC), the anodes are made up of 50% YSZ with varying NiO:CeO2 percentages from 0% NiO, 50% CeO2 to 50% NiO, 0% CeO2. The performance is measured based on maximum power density (MPD), electrochemical impedance spectroscopy (EIS) and activation energy, Ea of the ohmic (Rohm) and charge transfer (Rct) processes. We found that by lowering the Ni content to lower than 50% NiO, anode conductivity will drop by 7-fold. An anode containing 37.5% NiO, 12.5% CeO2 yield MPD of 41.1 and 2.9 mW cm−2 when tested on H2 and CH4 fuels thus have the lowest Ni content without an abrupt negative effect on the MPD and EIS. The significant effect of conductivity drops on MPD and EIS are observed to occur at 25% NiO, 25% CeO2 and lowe.....

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Detecting methane (CH4) at room temperature through adsorption-based sensing poses a challenge due to its inert properties. In this study, we enhance both the sensitivity and selectivity of CH4 detection by decorating ZnO nanorods (ZNRs) with platinum (Pt), forming Pt-decorated ZNRs (PZNRs), which are then coated on a microcantilever surface. The sensor's response is monitored by measuring the resonance frequency shift, ranging from 3 to 20 Hz, and Q-factor of 194 to 208, as CH4 flows at rates of 10-100 mL/min under room temperature conditions. The introduction of Pt significantly enhances the sensor's sensitivity to picogram levels, enabling the detection of extremely low concentrations of CH4. To assess the sensor's selectivity, we compared its response to CH4 with that of carbon monoxide (CO). The results demonstrate that the sensor exhibits a substantially higher response to CH4, with CO detection showing minimal (9-19 times smaller than CH4) or no response. The presence of Pt atom.....

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