Influence of the reactant gas on the electrical properties of alumina-supported tin dioxide catalysts

Scurtu, Mariana; Hornoiu, Cristian; Căldăraru, M.; Munteanu, Cornel; Postole, G.; Ionescu, N. I.; Yuzhakova, Tatiana; Rédey, Ákos

doi:10.1007/s11144-011-0409-x

Cited by 3 publications

(1 citation statement)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A similar anomaly in the thermal dependence of surface conductance of γ-alumina can be attributed to proton hopping among adsorbed water molecules . Further evidence of the role of water in the thermal dependence of surface conductance of SnO 2 comes from Scurtu et al, who, upon heating alumina-supported SnO 2 under a flow of dry argon, reported the evolution of water in the effluent between ca. 373–573 K. Additional evidence of the role of water was reported by Caldararu et al, who found the low-temperature conductance of SnO 2 powder is much lower during the second and later cycles when measured for successive heat–cool cycles under a flow of dry inert gas (i.e., after one drying cycle, there was a dramatic drop in conductance, especially at the low end of the 373–673 K temperature range of the thermal cycle).…”

Section: Introductionmentioning

confidence: 83%

Role of Proton Hopping in Surface Charge Transport on Tin Dioxide As Revealed by the Thermal Dependence of Conductance

Wexler

Sohlberg

2014

J. Phys. Chem. A

View full text Add to dashboard Cite

The presence of water on an oxide surface can dramatically alter its electrical properties with important consequences for electrical measurements by scanning probe microscopy, and for the use of semiconducting oxides in sensing applications. Here, the thermal dependence of the conductance of tin dioxide is interpreted by combining semiconductor equilibrium carrier statistics with a proton hopping mechanism. First, the functional form of this charge transport model is fit to experimental conductance data for tin dioxide. Next, the important energy parameters in the model are computed with density functional theory. Comparing the values of the energy parameters obtained by fitting, to the values for the same parameters obtained from electronic structure calculations, yields new insight into the surface charge transport in tin dioxide. In particular, it is found that mobile protons, freed from the dissociative adsorption of water on the [110] surface, are an essential component of the observed thermal dependence of conductance in tin dioxide.

show abstract

Section: Introductionmentioning

confidence: 83%