Up- and downstream of the catalyst, a wideband lambda probe (UEGO sensor, type Bosch LSU) was mounted.
The 3X FLAG tag Peptide device was made of an yttria-stabilized zirconia disc (8YSZ, thickness 300 μm) with identical electrodes (diameter 5 mm). We used Pt electrodes on both sides for different experiments (Fig. 4). The electrochemical cell is defined asO2, C3H6(1), Pt YSZ Pt, O2, C3H6(2).
Fig. 4. Top view on YSZ sample cell with identical electrodes on both sides: Pt electrodes were made from a screen-printable paste and sintered on YSZ substrates. Connections were made with Pt wires.Figure optionsDownload full-size imageDownload as PowerPoint slide
A special stainless steel setup comprised two separated chambers and a gas inlet on each side (details in ). For gas tight sealing, a mica seal, cut to the right geometry by a laser, was used. The zirconia disc itself separated both chambers/atmospheres from each other. Each chamber was purged by a constant flow (500 ml/min), branched off from the up- or downstream gas flow, respectively. The whole cell setup that forms the CRS device is located inside of a muffle furnace. Hence, it can be heated to a defined temperature allowing sensor temperature control, independently from the DOC temperature.