Interfacial electrostatic behaviour of oxides: correlations with structural and surface parameters of the phase

Ardizzone, S.; Cattania, M.G.; Lugo, P.

doi:10.1016/0013-4686(94)85128-x

Cited by 36 publications

(10 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In catalyst preparation by deposition-precipitation, the pH associated with the point of zero charge (pHPZC) is a critical property that determines precursorsupport interaction as a function of solution pH [40]. A pHPZC of 7.4 was determined experimentally for ZrO2, which is within the range of values (6.2-8.5) reported elsewhere [52,53]. The pHPZC is dependent on ZrO2 preparation and composition where a higher value (8.5) is associated with a monoclinic relative to tetragonal phase (6.2) [52].…”

Section: Zro2 Synthesis and Characterisationsupporting

confidence: 52%

Selective gas phase hydrogenation of p-nitrobenzonitrile to p-aminobenzonitrile over zirconia supported gold

Wang

Hao

Keane

2016

Applied Catalysis A: General

View full text Add to dashboard Cite

The catalytic action of Au/ZrO2 in the gas phase hydrogenation of p-nitrobenzonitrile (p-NBN) to p-aminobenzonitrile (p-ABN) has been assessed against Au/Al2O3. Crystalline ZrO2 was prepared by precipitation of ZrOCl2 with aqueous NH3 and calcined to generate tetragonal and monoclinic phases. Catalyst and support were characterised by surface area/porosity, temperature-programmed reduction (TPR), H2 chemisorption/temperature programmed desorption (TPD), X-ray diffraction (XRD), transmission electron microscopy (TEM) and Xray photoelectron spectroscopy (XPS) measurements. Higher calcination temperatures (673-973 K) increased the monoclinic ZrO2 content with a decrease in surface area and pore volume. Introduction of Au by deposition-precipitation resulted in tetragonal→monoclinic transformation with post-TPR formation of Au particles in the 3-13 nm size range and electron transfer from ZrO2. Reaction over Au/ZrO2 delivered 100% p-ABN yield with higher turnover frequency (267 h-1) than Au/Al2O3 (109 h-1) attributed to greater H2 chemisorption capacity under reaction conditions and enhanced −NO2 activation. Au/ZrO2 outperformed benchmark Pd/Al2O3 and Ni/Al2O3, which generated p-aminotoluene via subsequent hydrogenation/hydrogenolysis.

show abstract

Section: Zro2 Synthesis and Characterisationsupporting

confidence: 52%

Selective gas phase hydrogenation of p-nitrobenzonitrile to p-aminobenzonitrile over zirconia supported gold

Wang

Hao

Keane

2016

Applied Catalysis A: General

View full text Add to dashboard Cite

show abstract

“…XPS fitting of Sc on Ag‐ScSZ 4 and Ag‐ScSZ 10 was not feasible due to insufficient amount of Sc on the surface. Zr 4+ (zirconia) and Zr 0 (metallic zirconium) correspond to Zr3d peaks with binding energies of 182.1 and 179.3 eV, respectively . In all the tested samples, the Zr 4+ area is dominant with a smaller Zr 0 area in the Zr3d spectrum even before annealing, indicating that the sputtered Sc–Zr layers formed oxides in ambient air.…”

Section: Resultssupporting

confidence: 71%

High‐Performance Silver Cathode Surface Treated with Scandia‐Stabilized Zirconia Nanoparticles for Intermediate Temperature Solid Oxide Fuel Cells

Choi

Kim

Neoh

et al. 2016

Advanced Energy Materials

View full text Add to dashboard Cite

This work introduces a novel silver composite cathode with a surface coating of scandia‐stabilized zirconia (ScSZ) nanoparticles for application in intermediate temperature solid oxide fuel cells (IT‐SOFCs). The ScSZ coating is expected to maximize the triple boundary area of the Ag electrode, ScSZ electrolyte, and oxygen gas, where the oxygen reduction reaction occurs. The coating also protects the porous Ag against thermal agglomeration during fuel cell operation. The ScSZ nanoparticles are prepared by sputtering scandium‐zirconium alloy followed by thermal oxidation on Ag mesh. The performance of the solid oxide fuel cells with a gadolinia‐doped ceria electrolyte support is evaluated. At temperatures <500 °C, our optimized Ag‐ScSZ cathode outperforms the bare Ag cathode and even the platinum cathode, which has been believed to be the best material for this purpose. The highest cell peak power with the Ag‐ScSZ cathode is close to 60 mW cm−2 at 450 °C, while bare Ag and optimized Pt cathodes produce 38.3 and 49.4 mW cm−2, respectively. Long‐term current measurement also confirms that the Ag‐ScSZ cathode is thermally stable, with less degradation than bare Ag or Pt.

show abstract

“…The curves in such plots also tend to become less curved with higher ionic strength (17). For UO 2 , there appears to be a common intersection point at the pzc, but a flattening of the curve for higher ionic strengths can not be seen.…”

Section: Thomentioning

confidence: 86%

Surface Charge Densities of Two Actinide(IV) Oxides: UO2 and ThO2

Olsson

Jakobsson

Albinsson

2002

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

Interfacial electrostatic behaviour of oxides: correlations with structural and surface parameters of the phase

Cited by 36 publications

References 31 publications

Selective gas phase hydrogenation of p-nitrobenzonitrile to p-aminobenzonitrile over zirconia supported gold

Selective gas phase hydrogenation of p-nitrobenzonitrile to p-aminobenzonitrile over zirconia supported gold

High‐Performance Silver Cathode Surface Treated with Scandia‐Stabilized Zirconia Nanoparticles for Intermediate Temperature Solid Oxide Fuel Cells

Surface Charge Densities of Two Actinide(IV) Oxides: UO2 and ThO2

Contact Info

Product

Resources

About