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Long Life Electrochemical Diodes for Continuous Electrowetting.

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Title: Long Life Electrochemical Diodes for Continuous Electrowetting.
Authors: Khodayari, Mehdi1, Hahne, Ben2, Crane, Nathan B.3 ncrane@usf.edu
Source: Journal of The Electrochemical Society. 2014, Vol. 161 Issue 6, pE105-E111. 7p.
Subjects: Diodes, Performance of electronics, Electric potential, Aluminum electrodes, Electrolyte solutions, Wetting, Electrochemical research
Abstract: The rate of electrochemical reactions in some systems varies with the polarity of the overpotential on the working electrode, introducing diode-like behavior at the electrode/electrolyte interface. However, with repeated bipolar cycling, the electrochemical current damages the electrodes. We have connected electrochemical diodes in series with opposing polarities to reduce the diode current while charging a capacitive circuit. We have previously used this capacitive circuit arrangement to actuate aqueous droplets continuously using the electrowetting (EW) effect. In this study, the performance of electrochemical diodes under repeated voltage cycles is investigated. Aluminum and titanium electrodes in contact with three electrolyte solutions (0.1Mcitric acid, 0.1 M Na2SO4 and 0.1 M NaOH) are employed. The diode behavior of electrochemical systems with single diodes and diode pairs is compared. A coefficient of continuous electrowetting (CEW) actuation (referred to as actuation coefficient) is introduced. Actuation coefficient varies between zero (no actuation) and one (equivalent to grounded droplet actuation at the same voltage. Experimental results how that titanium maintains higher actuation coefficients (0.6-0.8) than aluminum (0.6). The actuation coefficients of titanium increase over the first trials and remain stable under alternating -50 V and +50 V inputs for 2000 trials (experiment duration). [ABSTRACT FROM AUTHOR]
Copyright of Journal of The Electrochemical Society is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 108684726
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PubTypeId: academicJournal
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  Data: Long Life Electrochemical Diodes for Continuous Electrowetting.
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  Data: <searchLink fieldCode="AR" term="%22Khodayari%2C+Mehdi%22">Khodayari, Mehdi</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Hahne%2C+Ben%22">Hahne, Ben</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Crane%2C+Nathan+B%2E%22">Crane, Nathan B.</searchLink><relatesTo>3</relatesTo><i> ncrane@usf.edu</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+The+Electrochemical+Society%22">Journal of The Electrochemical Society</searchLink>. 2014, Vol. 161 Issue 6, pE105-E111. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Diodes%22">Diodes</searchLink><br /><searchLink fieldCode="DE" term="%22Performance+of+electronics%22">Performance of electronics</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+potential%22">Electric potential</searchLink><br /><searchLink fieldCode="DE" term="%22Aluminum+electrodes%22">Aluminum electrodes</searchLink><br /><searchLink fieldCode="DE" term="%22Electrolyte+solutions%22">Electrolyte solutions</searchLink><br /><searchLink fieldCode="DE" term="%22Wetting%22">Wetting</searchLink><br /><searchLink fieldCode="DE" term="%22Electrochemical+research%22">Electrochemical research</searchLink>
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  Data: The rate of electrochemical reactions in some systems varies with the polarity of the overpotential on the working electrode, introducing diode-like behavior at the electrode/electrolyte interface. However, with repeated bipolar cycling, the electrochemical current damages the electrodes. We have connected electrochemical diodes in series with opposing polarities to reduce the diode current while charging a capacitive circuit. We have previously used this capacitive circuit arrangement to actuate aqueous droplets continuously using the electrowetting (EW) effect. In this study, the performance of electrochemical diodes under repeated voltage cycles is investigated. Aluminum and titanium electrodes in contact with three electrolyte solutions (0.1Mcitric acid, 0.1 M Na2SO4 and 0.1 M NaOH) are employed. The diode behavior of electrochemical systems with single diodes and diode pairs is compared. A coefficient of continuous electrowetting (CEW) actuation (referred to as actuation coefficient) is introduced. Actuation coefficient varies between zero (no actuation) and one (equivalent to grounded droplet actuation at the same voltage. Experimental results how that titanium maintains higher actuation coefficients (0.6-0.8) than aluminum (0.6). The actuation coefficients of titanium increase over the first trials and remain stable under alternating -50 V and +50 V inputs for 2000 trials (experiment duration). [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Journal of The Electrochemical Society is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1149/2.008406jes
    Languages:
      – Code: eng
        Text: English
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        PageCount: 7
        StartPage: E105
    Subjects:
      – SubjectFull: Diodes
        Type: general
      – SubjectFull: Performance of electronics
        Type: general
      – SubjectFull: Electric potential
        Type: general
      – SubjectFull: Aluminum electrodes
        Type: general
      – SubjectFull: Electrolyte solutions
        Type: general
      – SubjectFull: Wetting
        Type: general
      – SubjectFull: Electrochemical research
        Type: general
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      – TitleFull: Long Life Electrochemical Diodes for Continuous Electrowetting.
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            NameFull: Khodayari, Mehdi
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            NameFull: Hahne, Ben
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            NameFull: Crane, Nathan B.
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            – D: 01
              M: 06
              Text: 2014
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            – TitleFull: Journal of The Electrochemical Society
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