Durable carrier-free catalytic combustion H2 sensor based on PdPt alloy nanoparticles

The new palladium nanoparticles (Pd NPs) based carrier-free catalytic combustion hydrogen (H 2 ) sensor presents a promising potential for H 2 energy vehicle due to excellent vibration and low power consumption. However, the sintering of the Pd NPs at elevated temperatures decreases the sensitivity, limiting the applications of these sensors. To enhance the durability of Pd NPs based carrier-free catalytic combustion H 2 sensor, palladium-platinum alloy nanoparticles (PdPt NPs) was fabricated on the filament by a co-electrodeposition method. The impact of morphology and composition of PdPt NPs on the sensing performance was systematically investigated. The results indicated that Pt atoms in the alloy can restrict the mobility of Pd atoms, which may reduce the sintering between particles at elevated temperatures. Compared to a pure Pd NPs H 2 sensor, the PdPt NPs H 2 sensor demonstrated superior sensitivity and linearity and their low power consumption and durability were significantly improved.