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Title: Real space mapping of oxygen vacancy diffusion and electrochemical transformations by hysteretic current reversal curve measurements

Abstract

An excitation voltage biases an ionic conducting material sample over a nanoscale grid. The bias sweeps a modulated voltage with increasing maximal amplitudes. A current response is measured at grid locations. Current response reversal curves are mapped over maximal amplitudes of the bias cycles. Reversal curves are averaged over the grid for each bias cycle and mapped over maximal bias amplitudes for each bias cycle. Average reversal curve areas are mapped over maximal amplitudes of the bias cycles. Thresholds are determined for onset and ending of electrochemical activity. A predetermined number of bias sweeps may vary in frequency where each sweep has a constant number of cycles and reversal response curves may indicate ionic diffusion kinetics.

Inventors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1133818
Patent Number(s):
8,752,211
Application Number:
13/566,327
Assignee:
UT-Battelle, LLC (Oak Ridge, TN) ORO
DOE Contract Number:
AC05-00OR22725
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Kalinin, Sergei V., Balke, Nina, Borisevich, Albina Y., Jesse, Stephen, Maksymovych, Petro, Kim, Yunseok, and Strelcov, Evgheni. Real space mapping of oxygen vacancy diffusion and electrochemical transformations by hysteretic current reversal curve measurements. United States: N. p., 2014. Web.
Kalinin, Sergei V., Balke, Nina, Borisevich, Albina Y., Jesse, Stephen, Maksymovych, Petro, Kim, Yunseok, & Strelcov, Evgheni. Real space mapping of oxygen vacancy diffusion and electrochemical transformations by hysteretic current reversal curve measurements. United States.
Kalinin, Sergei V., Balke, Nina, Borisevich, Albina Y., Jesse, Stephen, Maksymovych, Petro, Kim, Yunseok, and Strelcov, Evgheni. Tue . "Real space mapping of oxygen vacancy diffusion and electrochemical transformations by hysteretic current reversal curve measurements". United States. doi:. https://www.osti.gov/servlets/purl/1133818.
@article{osti_1133818,
title = {Real space mapping of oxygen vacancy diffusion and electrochemical transformations by hysteretic current reversal curve measurements},
author = {Kalinin, Sergei V. and Balke, Nina and Borisevich, Albina Y. and Jesse, Stephen and Maksymovych, Petro and Kim, Yunseok and Strelcov, Evgheni},
abstractNote = {An excitation voltage biases an ionic conducting material sample over a nanoscale grid. The bias sweeps a modulated voltage with increasing maximal amplitudes. A current response is measured at grid locations. Current response reversal curves are mapped over maximal amplitudes of the bias cycles. Reversal curves are averaged over the grid for each bias cycle and mapped over maximal bias amplitudes for each bias cycle. Average reversal curve areas are mapped over maximal amplitudes of the bias cycles. Thresholds are determined for onset and ending of electrochemical activity. A predetermined number of bias sweeps may vary in frequency where each sweep has a constant number of cycles and reversal response curves may indicate ionic diffusion kinetics.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jun 10 00:00:00 EDT 2014},
month = {Tue Jun 10 00:00:00 EDT 2014}
}

Patent:

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  • A method and system for probing mobile ion diffusivity and electrochemical reactivity on a nanometer length scale of a free electrochemically active surface includes a control module that biases the surface of the material. An electrical excitation signal is applied to the material and induces the movement of mobile ions. An SPM probe in contact with the surface of the material detects the displacement of mobile ions at the surface of the material. A detector measures an electromechanical strain response at the surface of the material based on the movement and reactions of the mobile ions. The use of anmore » SPM tip to detect local deformations allows highly reproducible measurements in an ambient environment without visible changes in surface structure. The measurements illustrate effective spatial resolution comparable with defect spacing and well below characteristic grain sizes of the material.« less
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