Charge-transfer engineering strategies for tailored ionic conductivity at oxide interfaces

Based on the example of the p-type LaAlO3/SrTiO3 interface, we discuss charge-transfer phenomena that tailor the ionic conductivity along oxide heterointerfaces, by providing a confined space-charge layer as channel for oxygen ion conduction.

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Enhanced Ionic Conductivity in Composite Electrolytes

MRS Proceedings ◽

10.1557/proc-135-611 ◽

1988 ◽

Vol 135 ◽

Author(s):

Nancy J. Dudney

Keyword(s):

Ionic Conductivity ◽

Space Charge ◽

Carrier Concentration ◽

Space Charge Polarization ◽

Space Charge Layer ◽

Submicron Particles ◽

Composite Electrolytes ◽

Charge Layer ◽

Charge Polarization ◽

Alumina Particles

The ionic conductivity of a large number of electrolyte materials, such as LiI, AgCl, AgI and CuCl, is known to be enhanced by the addition of inert submicron particles, most often alumina. Typically the conductivity is enhanced by I to 3 orders of magnitude for composites containing 10 to 40 volume % particles. Several other researchers have attributed this effect to an enhanced carrier concentration in a space charge polarization layer surrounding the alumina particles. However, estimates of the magnitude of such a space charge layer indicate that this mechanism alone can not account for the large enhanced conductivities reported for several of the composites.

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Charge carrier transport in oxygen-ion conducting electrolytes with considering space charge layer effect

Acta Physica Sinica ◽

10.7498/aps.70.20201651 ◽

2021 ◽

Vol 0 (0) ◽

pp. 0-0

Author(s):

Keyword(s):

Charge Carrier ◽

Space Charge ◽

Carrier Transport ◽

Space Charge Layer ◽

Charge Carrier Transport ◽

Charge Layer ◽

Oxygen Ion ◽

Layer Effect ◽

Ion Conducting

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Semiconducting Behavior of Non-Solid Electrochemical State of Carbon Steel in Electrolyte Solution

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.785-786.944 ◽

2013 ◽

Vol 785-786 ◽

pp. 944-947

Author(s):

Wei Dong Liu ◽

Yi Xiao ◽

Jian Feng Gu ◽

Qi Jun Zhong ◽

Li Bin Yu ◽

...

Keyword(s):

Carbon Steel ◽

Space Charge ◽

Sulfate Solution ◽

Space Charge Layer ◽

Sodium Sulfate Solution ◽

Acid Base ◽

Charge Layer ◽

Capacitance Variation ◽

P Type ◽

Semiconducting Behavior

In this paper, the semiconducting behavior of non-solid electrochemical state of carbon steel in acid, base and salt solutions was studied by utilizing potential-capacitance and Mott-Schottky analysis. It was pointed out that the capacitance variation of space charge layer of non-solid electrochemical state of carbon steel in different solution was different. The non-solid electrochemical state showed p-type semiconducting behavior in 5 sulfuric acid and 5 % sodium sulfate solution. However, it showed n-type semiconducting behavior in 5 % sodium hydroxide, suggesting that the space charge layer of non-solid electrochemical state of the carbon steel in different electrolytes might be asymmetric.

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Depletion layer controls photocatalytic hydrogen evolution with p-type gallium phosphide particles

Journal of Materials Chemistry A ◽

10.1039/c9ta05879f ◽

2019 ◽

Vol 7 (30) ◽

pp. 18020-18029 ◽

Cited By ~ 3

Author(s):

Zeqiong Zhao ◽

Emma J. Willard ◽

Julius R. Dominguez ◽

Zongkai Wu ◽

Frank E. Osterloh

Keyword(s):

Space Charge ◽

Hydrogen Evolution ◽

Gallium Phosphide ◽

Depletion Layer ◽

Space Charge Layer ◽

Layer Model ◽

Photocatalytic Hydrogen Evolution ◽

Charge Layer ◽

P Type ◽

Low Activity

p-Type gallium phosphide (p-GaP) is an established photocathode material for hydrogen evolution, however, photocatalytic hydrogen evolution from p-GaP photocatalysts generally proceeds with very low activity. This can be understood on the basis of the space charge layer model presented here.

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Thermally-Induced Dopant Segregation Effects on the Space Charge Layer and Ionic Conductivity of Nanocrystalline Gadolinia-Doped Ceria

Journal of The Electrochemical Society ◽

10.1149/2.1201608jes ◽

2016 ◽

Vol 163 (8) ◽

pp. F919-F926 ◽

Cited By ~ 16

Author(s):

Jiwoong Bae ◽

Yonghyun Lim ◽

Jun-Sik Park ◽

Dohaeng Lee ◽

Soonwook Hong ◽

...

Keyword(s):

Ionic Conductivity ◽

Space Charge ◽

Space Charge Layer ◽

Doped Ceria ◽

Thermally Induced ◽

Dopant Segregation ◽

Charge Layer

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SPACE-CHARGE LAYER, INTRINSIC "BULK" AND SURFACE COMPLEX DEFECTS IN ZnO NANOPARTICLES — A HIGH-FIELD ELECTRON PARAMAGNETIC RESONANCE ANALYSIS

Functional Materials Letters ◽

10.1142/s1793604713300041 ◽

2013 ◽

Vol 06 (04) ◽

pp. 1330004 ◽

Cited By ~ 11

Author(s):

RÜDIGER-A. EICHEL ◽

EMRE ERDEM ◽

PETER JAKES ◽

ANDREW OZAROWSKI ◽

JOHAN VAN TOL ◽

...

Keyword(s):

Electron Paramagnetic Resonance ◽

Space Charge ◽

Zno Nanoparticles ◽

High Field ◽

Space Charge Layer ◽

Paramagnetic Resonance ◽

Charge Layer ◽

Type Formula ◽

Field Electron ◽

Electron Paramagnetic

The defect structure of ZnO nanoparticles is characterized by means of high-field electron paramagnetic resonance (EPR) spectroscopy. Different point and complex defects could be identified, located at the "bulk" or the surface region of the nanoparticles. In particular, by exploiting the enhanced g-value resolution at a Larmor frequency of 406.4 GHz, it could be shown that the resonance commonly observed at g = 1.96 is comprised of several overlapping resonances from different defects. Based on the high-field EPR analysis, the development of a space-charge layer could be monitored that consists of (shallow) donor-type [Formula: see text] defects at the "bulk" and acceptor-type [Formula: see text] and complex [Formula: see text] defects at the surface. Application of a core-shell model allows to determine the thickness of the depletion layer to 1.0 nm for the here studied compounds [J.J. Schneider et al., Chem. Mater.22, 2203 (2010)].

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