Advanced Sensor Arrays and Packaging
Novel sensor packaging elements were designed, fabricated, and tested in order to facilitate the transition of electrochemical mixed-potential sensors toward commercialization. Of the two designs completed, the first is currently undergoing field trials, taking direct measurements within vehicle exhaust streams, while the second is undergoing preliminary laboratory testing. The sensors’ optimal operating conditions, sensitivity to hydrogen, and long-term baseline stability were also investigated. The sensing capabilities of lanthanum chromite (La 0.8 Sr 0.2 CrO 3 ) and indium-doped tin oxide (ITO) working electrodes were compared, and the ITO devices were selected for pre-commercial field trials testing at a hydrogen fuel cell vehicle fueling station in California. Previous data from that fueling station were also analyzed, and the causes of anomalous baseline drift were identified.