X-ray photoelectron studies on some oxides and hydroxides of cobalt, nickel, and copper

McIntyre, N. S.; Cook, M. G.

doi:10.1021/ac60363a034

Cited by 1,671 publications

(1,061 citation statements)

References 34 publications

Supporting

160

Mentioning

895

Contrasting

Unclassified

Order By: Relevance

“…The EXAFS data from the as-prepared catalyst indicates only Co-O interactions, indicative of a highly dispersed cobalt-oxygen moeity. XPS of the asprepared catalyst showed a Co(2p, 3/2) peak at 781.1 eV with strong satellite structure characteristic of reference XPS data of Co(II) hydroxide [18]. Platinum particles in the as-prepared materials should be unchanged from their original form, but in Series A the particles show about a 50% increase in size relative to the starting material.…”

Section: Discussionmentioning

confidence: 88%

Structure and activity of Pt-Co alloys as oxygen reduction electrocatalysts

Beard¹,

Ross²

1986

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 88%

Structure and activity of Pt-Co alloys as oxygen reduction electrocatalysts

Beard¹,

Ross²

1986

View full text Add to dashboard Cite

“…21 In addition, a new peak in the O 1s spectrum at a BE of 532.0 eV (Figure 2b, shown in magenta color) also appears, further confirming the existence of Co(OH) 2 . 25,26 Comparing the BE positions of the liquid phase from the thin film, one can find that both the O 1s and K 2p BEs shift to low BE as the holding potential changes from −1.35 to −0.4 V. This phenomenon, the rigid BE shift of liquid phase matches the electrochemical potential shift of the WE with respect to the Ag/AgCl RE, is described in detail in our previous study on a solid/liquid interface system by electrochemical oxidation of the Pt electrode. 12 Since the WE is grounded, the matching shifts between electrolyte BEs (O 1s and K 2p) and the potential change is direct evidence of the conductive nature of the thin electrolyte film.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Observing the Electrochemical Oxidation of Co Metal at the Solid/Liquid Interface Using Ambient Pressure X-ray Photoelectron Spectroscopy

et al. 2017

View full text Add to dashboard Cite

Recent advances of ambient pressure X-ray photoelectron spectroscopy (AP-XPS) have enabled the chemical composition and the electrical potential profile at a liquid/electrode interface under electrochemical reaction conditions to be directly probed. In this work, we apply this operando technique to study the surface chemical composition evolution on a Co metal electrode in 0.1 M KOH aqueous solution under various electrical biases. It is found that an ∼12.2 nm-thick layer of Co(OH)2 forms at a potential of about −0.4 VAg/AgCl, and upon increasing the anodic potential to about +0.4 VAg/AgCl, this layer is partially oxidized into cobalt oxyhydroxide (CoOOH). A CoOOH/Co(OH)2 mixture layer is formed on the top of the electrode surface. Finally, the oxidized surface layer can be reduced to Co0 at a cathodic potential of −1.35 VAg/Cl. These observations indicate that the ultrathin layer containing cobalt oxyhydroxide is the active phase for oxygen evolution reaction (OER) on a Co electrode in an alkaline electrolyte, consistent with previous studies.

show abstract

“…In recent years there have been several examples where X-ray photoelectron spectroscopy (XPS) has been used to study the electronic structure and spectral characteristics of transition metal oxides [1,2]. Specifically, XPS has been used to measure the chemical shifts associated with core level photoemission spectra when non-equivalent atoms of the same element in a solid give rise to core level peaks with measurably different binding energies.…”

Section: Introductionmentioning

confidence: 99%

Structure and magnetic properties of vanadium–sodium silicate glasses

Mekki

Khattak

Holland

et al. 2003

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

Vanadium-sodium silicate glasses with the chemical composition [ðV 2 O 5 Þ x (Na 2 O) 0:30 ðSiO 2 Þ 0:70Àx ] ð0:0 6 x 6 0:10Þ have been studied by X-ray photoelectron spectroscopy (XPS) and magnetization measurements. The core-level binding energies of O 1s, V 2p and Si 2p in these glasses have been measured for surfaces produced by in vacuo fracture. The peak position and width of the V 2p 3=2 peak are independent of the V 2 O 5 content while the O 1s core-level spectra show significant composition-dependent changes. Two distinct peaks are resolvable arising from the bridging oxygen and non-bridging oxygen (NBO) atoms in the silicate glasses. The fraction of NBO, determined from these spectra is found to increase with increasing V 2 O 5 content in the glass and are consistent with the formation of predominantly alkali metavanadate species. The magnetic susceptibility data of these glasses indicate a large, temperature-independent diamagnetic contribution arising from the glass matrix as well as small paramagnetic contribution from the V 4þ ions. The V 4þ content deduced from the magnetization results ($2%) is below the detection limit of XPS analysis.

show abstract

X-ray photoelectron studies on some oxides and hydroxides of cobalt, nickel, and copper

Cited by 1,671 publications

References 34 publications

Structure and activity of Pt-Co alloys as oxygen reduction electrocatalysts

Structure and activity of Pt-Co alloys as oxygen reduction electrocatalysts

Observing the Electrochemical Oxidation of Co Metal at the Solid/Liquid Interface Using Ambient Pressure X-ray Photoelectron Spectroscopy

Structure and magnetic properties of vanadium–sodium silicate glasses

Contact Info

Product

Resources

About