Galvanic cells for in-situ AES study of metal oxide surfaces

Stout, D.A; Gavelli, G.; Lumsden, J. B.; Staehle, R. W.

doi:10.1016/0039-6028(77)90152-2

Cited by 11 publications

(2 citation statements)

References 6 publications

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“…At temperatures where the kinetics (ion mobilities, etc.) are sufficiently high, the oxygen activity (expressed as an equivalent oxygen partial pressure) at the “working” ABO 3 electrode can be varied over a wide range by varying the voltage on the cell . The equilibrium working electrode oxygen potential, , expressed as the equivalent oxygen partial pressure, is given (from a rearrangement of the Nernst equation) by where is the oxygen potential at the reference electrode, fixed by the Pd:PdO redox couple.…”

Section: Introductionmentioning

confidence: 99%

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In Situ XPS Studies of Perovskite Oxide Surfaces under Electrochemical Polarization

2004

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An in situ XPS study of oxidation-reduction processes on three perovskite oxide electrode surfaces was carried out by incorporating the materials in an electrochemical cell mounted on a heated sample stage in an ultrahigh vacuum (UHV) chamber. Electrodes made of powdered LaCr(1-x)Ni(x)O(3-delta) (x = 0.4, 1) showed changes in the XPS features of all elements upon redox cycling between formal Ni3+ and Ni2+ oxidation stoichiometries, indicating the delocalized nature of the electronic states involved and strong mixing of O 2p to Ni 3d levels to form band states. The surface also showed changes in adsorption capacity for CO2 upon reduction as a result of increased nucleophilicity of surface oxygen. Another perovskite oxide, La(0.5)Sr(0.5)CoO(3-delta), laser deposited as highly oriented thin films on (100) oriented yttria-stabilized zirconia (YSZ), also showed evidence of both local and nonlocal effects in the XPS features upon redox cycling. In contrast to LaCr(1-x)Ni(x)O(3-delta), redox cycling mainly affected the XPS features of cobalt with little effect on oxygen. This signifies reduced participation of O 2p states in the conduction band of this material. Small changes in surface cation stoichiometry in this film were observed and attributed to mobility of the A-site Sr dopant under polarization.

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Section: Introductionmentioning

confidence: 99%

“…An applied voltage forces oxide ions through the electrolyte (changing the oxidation potential of the working electrode) until equilibration to the applied potential is reached. This technique has been used occasionally to alter the surface characteristics or to modify the surface reactivity in electrochemical reactors. − …”

Section: Introductionmentioning

confidence: 99%

In Situ XPS Studies of Perovskite Oxide Surfaces under Electrochemical Polarization

2004

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Surface Composition of Wustite

Grabke

Viefhaus

1980

Ber Bunsenges Phys Chem

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Adsorption I Katalyse I ReaktionskinetikUsing a solid electrolyte cell inside an UHV-system the surface composition of oxides and metals can be studied at high temperatures 700 to 1OOO"C and well defined oxygen activities in the range po, = lo-'' to bar. AES-measurements on wustite have shown that at temperatures >8OO"C the composition of the surface shows the same change with the varied oxygen activity as would be expected for the bulk. At temperatures below 800 "C the change of surface oxygen content is larger than the change of bulk oxygen which indicates the presence of adsorbed oxygen. An adsorption isotherm obtained at 720°C shows that the degree of coverage 0 = 0.07 is approached near the

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ESCA Studies of Electrode Surfaces

Sherwood

1982

Contemporary Topics in Analytical and Clinical Chemistry

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Galvanic cells for in-situ AES study of metal oxide surfaces

Cited by 11 publications

References 6 publications

In Situ XPS Studies of Perovskite Oxide Surfaces under Electrochemical Polarization

In Situ XPS Studies of Perovskite Oxide Surfaces under Electrochemical Polarization

Surface Composition of Wustite

ESCA Studies of Electrode Surfaces

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