Electrolysis of CO2 and H2O

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

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Figure 5-10. Impedance spectra measured at OCV at 1000 °C at Cu, Ni, Pd and Pt electrodes in various H2/H2O atmospheres and CO/CO2 atmospheres....................................................................125 Figure 5-11. Examples of gas partial pressure dependencies of LSRP of the various metal electrodes .......................................................................................................................................................................... 126 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.........................................................................130 Figure 5-13. Potential sweeps of H2 oxidation (positive voltage) and H2O reduction (negative voltage) at Ni/YSZ at different temperatures and gas compositions ................................................... 133 Figure 5-14. Example polarization curves on a Ni electrode at 850 °C..............................................135 Figure 5-15. SEM micrograph of the belt of Ni particles found on the smooth YSZ surface outside of the contact area after tests with anodic polarizations ......................................................................... 135 Figure 5-16. Polarization curves performed at 1-2 mV/s at 850 °C in 50% H2O/H2 and 50% CO2/CO, on (a) Cu, (b) Ni, (c), Pd, and (d) Pt wire electrodes.............................................................136 Figure 5-17. The same potential sweeps as in Figure 5-16, now with the results for the different metals overlaid at the same experimental conditions ..............................................................................136 Figure 5-18. Impedance spectra measured under DC bias from +300 to –300 mV in 150 mV increments on a Ni electrode at 1000 °C in 3% H2O/H2 ......................................................................138 Figure 5-19. Impedance spectra measured on a Cu electrode under DC bias at 850 °C in (a) 50% H2O/H2 and (b) 50% CO2/CO .................................................................................................................139 Figure 5-20. Impedance spectra measured on a Ni electrode under DC bias at 850 °C in (a) 50% H2O/H2 and (b) 50% CO2/CO .................................................................................................................139 Figure 5-21. Impedance spectra measured on a Pd electrode under DC bias at 850 °C in (a) 50% H2O/H2 and (b) 50% CO2/CO .................................................................................................................140 Figure 5-22. Impedance spectra measured on a Pt electrode under DC bias at 850 °C in (a) 50% H2O/H2 and (b) 50% CO2/CO .................................................................................................................140 Figure 5-23. LSRP at OCV before and after the polarizations, for each metal..................................144 Figure 5-24. Impedance spectra measured at OCV in 3% H2O/H2 before and after oxidation at 850 °C. ............................................................................................................................................................146 Figure 5-25. Impedance spectra measured at OCV before and after oxidation at 1000 °C ............ 146 Figure 5-26. Scanning electron micrograph of the Ni wire that was oxidized twice during testing. .......................................................................................................................................................................... 146 Figure 5-27. Strong cathodic polarization curves performed on a Ni electrode at 850 °C in dry H2 .......................................................................................................................................................................... 149 vi

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