Electrochemical abatement of pollutants NO[sub x] and SO[sub x] in combustion exhaust gases employing a solid-oxide electrolyte

Technical Report · Sun Jan 01 04:00:00 EST 1989

DOI:https://doi.org/10.2172/6935660· OSTI ID:6935660

Stevenson, D A; Frank, C W

During the fourth quarter of this grant, the major accomplishment concerns the spectroscopic investigation of oxygen vacancies in YSZ and ESB. The nature of electrolytic blackening'' was studied. It was found that the same reduction processes that turn polycrystalline YSZ black turn single crystals orange. Two absorption bands attributable to this orange coloration, 328 and 470 nm, were observed. The 328 nm absorption band agrees with theoretical calculations for an F-center YSZ. Several fluorescence bands were also observed. An excitation band at 302 nm was found to increase in intensity upon reduction of YSZ and the resulting emission at 580 nm was found to have a temperature dependence typical of F-centers. These results are in agreement with the hypothesis of the formation of color-centers upon reduction of YSZ as being responsible for blackening'' and the resulting enhancement of electrocatalytic reactivity.

• Research Organization: Stanford Univ., CA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-88PC88914
• OSTI ID: 6935660
• Report Number(s): DOE/PC/88914-T6; ON: DE93002575
• Country of Publication: United States
• Language: English

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