Electrolysis of CO2 and H2O

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Electrolysis of CO2 and H2O ( electrolysis-co2-and-h2o )

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Chapter 5. Aspects of Metal-YSZ Electrode Kinetics 130 Figure 5-12. Temperature dependence of LSRP for the metal electrodes in (a) 97% H2 + 3% H2O, (b) 50% H2 + 50% H2O, and (c) 50% CO + 50% CO2. The relative performance of the metals at OCV in the three different gas compositions observed at 1000 °C (Figure 5-10) holds throughout this temperature range, due to the similar activation energies. In 3% H2O/H2, Pd shows the lowest LSRP, followed by Ni, and then Cu and Pt which have nearly the same LSRP (Pd > Ni > Pt/Cu). In 50% H2O/H2, the order is different: Ni > Pd > Pt > Cu. Pd is less active than it was in the higher H2/H2O ratio. The results from literature do not consistently agree with these results (although they are also not generally available for the same gas compositions). In the Baker et al study mentioned above, LSRP went Pt > Ni > Pd at 800 °C. If their 5% H2 + 5% H2O + 90% N2 atmosphere can be compared to 50% H2O/H2 because the H2/H2O ratio is the same, then Pt was simply much more active in that study than it was here. As mentioned above, the EA was also much lower than

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