The effect of ultrasound on the electrochemical loading of hydrogen in palladium

Alastair Wark, S. Crouch-Baker, M.C.H. McKubre, F.L. Tanzella

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Although the application of ultrasound for the control
and modulation of various chemical processes is a subject
of continued interest [l], there is surprisingly little discus-
sion in the recent literature of the effects of ultrasound on
fundamental electrochemical processes. In early systematic
studies of the hydrogen evolution reaction under acidic
conditions [2,3], it was observed that, on a platinum elec-
trode, the overvoltage for hydrogen evolution decreased by
up to 30mV on the application of ultrasound, and that this
decrease was largely independent of current density in the
approximate range l-100 mA cm-‘, i.e. the Tafel slope
was largely unaffected under these conditions. On removal
of the ultrasound, the original polarization was regained
only on continued electrolysis for up to 1 h. These results
refer to electrolytes which had been pre-electrolysed for 10
to 20h. With more extensive pre-electrolysis (36h), the
results were generally similar; however, the polarization
decrease on the application of ultrasound was smaller (by a
factor of two) under comparable conditions, and the origi-
nal polarization was recovered rapidly on cessation of
irradiation. On the application of ultrasound to a nickel
electrode evolving hydrogen, the same general phe-
nomenon was observed, i.e. a decrease in overvoltage
without a significant change in Tafel slope [3]. For these
experiments, the acoustic frequency was 3OOkHz and the
;icoustic intensity was estimated to be approximately
I Wcmw2 of electrode area.
LanguageEnglish
Pages199-204
Number of pages6
JournalJournal of Electroanalytical Chemistry
Volume418
DOIs
Publication statusPublished - 1996

Fingerprint

Palladium
Electrolysis
Hydrogen
Electrodes
Ultrasonics
Chemical Phenomena
Polarization
Platinum
Nickel
Acoustics
Electrolytes
Current density
Modulation
Irradiation
Experiments

Keywords

  • ultrasound
  • electrochemical loading
  • hydrogen in palladium

Cite this

Wark, Alastair ; Crouch-Baker, S. ; McKubre, M.C.H. ; Tanzella, F.L. / The effect of ultrasound on the electrochemical loading of hydrogen in palladium. In: Journal of Electroanalytical Chemistry. 1996 ; Vol. 418. pp. 199-204.
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abstract = "Although the application of ultrasound for the control and modulation of various chemical processes is a subject of continued interest [l], there is surprisingly little discus- sion in the recent literature of the effects of ultrasound on fundamental electrochemical processes. In early systematic studies of the hydrogen evolution reaction under acidic conditions [2,3], it was observed that, on a platinum elec- trode, the overvoltage for hydrogen evolution decreased by up to 30mV on the application of ultrasound, and that this decrease was largely independent of current density in the approximate range l-100 mA cm-‘, i.e. the Tafel slope was largely unaffected under these conditions. On removal of the ultrasound, the original polarization was regained only on continued electrolysis for up to 1 h. These results refer to electrolytes which had been pre-electrolysed for 10 to 20h. With more extensive pre-electrolysis (36h), the results were generally similar; however, the polarization decrease on the application of ultrasound was smaller (by a factor of two) under comparable conditions, and the origi- nal polarization was recovered rapidly on cessation of irradiation. On the application of ultrasound to a nickel electrode evolving hydrogen, the same general phe- nomenon was observed, i.e. a decrease in overvoltage without a significant change in Tafel slope [3]. For these experiments, the acoustic frequency was 3OOkHz and the ;icoustic intensity was estimated to be approximately I Wcmw2 of electrode area.",
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The effect of ultrasound on the electrochemical loading of hydrogen in palladium. / Wark, Alastair; Crouch-Baker, S.; McKubre, M.C.H.; Tanzella, F.L.

In: Journal of Electroanalytical Chemistry, Vol. 418, 1996, p. 199-204.

Research output: Contribution to journalArticle

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AU - Crouch-Baker, S.

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AB - Although the application of ultrasound for the control and modulation of various chemical processes is a subject of continued interest [l], there is surprisingly little discus- sion in the recent literature of the effects of ultrasound on fundamental electrochemical processes. In early systematic studies of the hydrogen evolution reaction under acidic conditions [2,3], it was observed that, on a platinum elec- trode, the overvoltage for hydrogen evolution decreased by up to 30mV on the application of ultrasound, and that this decrease was largely independent of current density in the approximate range l-100 mA cm-‘, i.e. the Tafel slope was largely unaffected under these conditions. On removal of the ultrasound, the original polarization was regained only on continued electrolysis for up to 1 h. These results refer to electrolytes which had been pre-electrolysed for 10 to 20h. With more extensive pre-electrolysis (36h), the results were generally similar; however, the polarization decrease on the application of ultrasound was smaller (by a factor of two) under comparable conditions, and the origi- nal polarization was recovered rapidly on cessation of irradiation. On the application of ultrasound to a nickel electrode evolving hydrogen, the same general phe- nomenon was observed, i.e. a decrease in overvoltage without a significant change in Tafel slope [3]. For these experiments, the acoustic frequency was 3OOkHz and the ;icoustic intensity was estimated to be approximately I Wcmw2 of electrode area.

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