Fabrication and sensing performance of carrier-free catalytic combustion hydrogen sensors based on electrodeposition method

A new catalytic combustion hydrogen (H2) sensor is developed using the electrodeposition method and the Pd catalyst layer is directly deposited on a Pt filament without carrier. The sensing performance was investigated by altering the electroplating time to control the thickness of the Pd catalyst layer. The sensitivity is changed with the increase of the Pd layer's thickness and the highest sensitivity (26.8) was obtained when the thickness is 1.635 μm. In addition, the new sensor exhibits great selectivity, while having the advantages of low power consumption (25 mW) and high vibration resistance. The achievement of this carrier-free sensor is expected to meet the requirement for H2 energy vehicles.