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Chapter 4. Co-electrolysis of CO2 and H2O in Solid Oxide Cells 98 Ni/YSZ cathode and 100% O2 supplied at 50 L/h to the LSM/YSZ anode, at current densities of –0.25, –0.5, and –1 A/cm2, operating for 382, 206, and 212 hours respectively at each galvanostatic segment. The same set of electrochemistry measurements as before the galvanostatic test were conducted after each segment, at the same temperatures and gas compositions. Glass Seal O2/Air flow H2O/H2 CO2/CO Flow Ni foil current collector Voltage probes Cell holder, Top piece Au foil current collector ACC Cell Nickel Mesh Cell holder, Bottom piece Figure 4-2. Risø-DTU cell assembly in a cross-flow pattern with a nickel seal and a nickel mesh, which provided both current collection and gas flow channels, at the side of the Ni/YSZ electrode, and a glass seal and an LSM/YSZ current collector / gas distributor at the side of the LSM/YSZ electrode, in an alumina housing, after [34]. Nickel seal Platinum Seal 4.3. 4.3.1. Performance Results and Discussion Figure 4-3 shows i-V curves for oxidation and reduction in H2/H2O/CO/CO2 mixtures at 850 °C. The gas mixtures used were 50% H2O + 50% H2, 50% CO2 + 50% CO, and 25% H2O + 25% CO2 + 25% H2 + 25% CO, and 45% H2O + 45% CO2 + 10% H2. The first three all give 50% reactants for either fuel cell or electrolysis operation, and the last is the compositionPDF Image | Electrolysis of CO2 and H2O
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