Dynamic Electrochemistry in Flame Plasma Electrolyte

Elahi, Atif; Fowowe, Toks; Caruana, Daren J.

doi:10.1002/anie.201200226

Cited by 12 publications

(12 citation statements)

References 30 publications

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“…Hickling Vennekamp, and Ogumi outlined the use of non-thermal plasma as an electrolyte for metal surface oxidation [1][2][3][4][5][6]. Our work extended this idea by using a flame plasma as an electrolyte to support redox reactions at an electrode surface probed using voltammetry [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 92%

Modulation of copper(I) oxide reduction/oxidation in atmospheric pressure plasma jet

Sener

Caruana

2018

Electrochemistry Communications

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We describe the controlled reduction of copper(I) oxide films to metallic copper in a nonthermal, atmospheric pressure, helium plasma jet. Thin layers (≈ 0.1 m) of Cu2O are electrochemically deposited onto Pt electrodes and placed in capacitively coupled helium plasma doped with H2, O2 and CH4 gases. Ex-situ Raman spectroscopy was used to probe the effect of plasma treatment on the deposited copper oxide layer. We show that application of a static bias voltage to the Pt substrate during plasma exposure can control the rate of reduction of the copper(I) oxide film. We propose that the reduction process is mediated by plasma electrons and controlling the electron flux to the surface can be used as a means to modulate the reduction process.

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Section: Introductionmentioning

confidence: 92%

Modulation of copper(I) oxide reduction/oxidation in atmospheric pressure plasma jet

Sener

Caruana

2018

Electrochemistry Communications

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“…In contrast, the corresponding reactions at the solid/gas interface still remain unexplored. The development of a reference electrode which is functional in the gas phase will extend and further facilitate the early work in the area of dynamic electrochemistry in gaseous plasmas 2. We describe the assessment of a unique reference electrode capable of establishing a redox potential through its innate chemical make‐up.…”

Section: Potential Difference For Reference Electrodes Made With Diffmentioning

confidence: 99%

Plasma Electrochemistry: Development of a Reference Electrode Material for High Temperature Plasma

Fowowe

Hadzifejzovic

et al. 2012

Advanced Materials

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This report describes the development of a high temperature reference electrode material for gas phase electrochemistry investigations. The electrode is constructed by careful assessment of different metal/metal oxide materials and operational stability in flame electrolyte medium. This will enable reliable dynamic electrochemistry investigations into redox reactions at the solid/gas interface, free of any solvent defined potential window restrictions.

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“…Gaseous plasmas have been identified as suitable media in which to study the electrochemical properties of ions by several authors. [2][3][4][5][6][7][8][9] Richmonds et al, Meiss et al and Hickling and Ingram have demonstrated charge-transfer processes at the plasma-liquid interface. [10][11][12] In addition, Vennekamp and Janek, Brettholle et al and Ogumi et al outlined the use of non-thermal plasma for metal surface oxidation.…”

Section: Introductionmentioning

confidence: 99%

“…We have previously described preliminary work on potentiodynamic experiments in a liquid-free electrochemical system using a flame plasma as the electrolyte medium. 8 In flames, negatively charged species are predominantly free electrons and positive species are complex ions. 17,18 Flames were selected over plasmas formed by discharge or microwave, as they are close to thermal equilibrium (T e E T m E T A+ ) 19 and relatively easy to control in the laboratory.…”

Section: Introductionmentioning

confidence: 99%

Plasma electrochemistry: voltammetry in a flame plasma electrolyte

Elahi

Caruana

2013

Phys. Chem. Chem. Phys.

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In this paper we present detailed dynamic electrochemical measurements in a flame plasma electrolyte in the presence of tungsten oxide salts. Defined reproducible redox processes are measured using conventional cyclic voltammetry in an operational potential window between 1 and -9 V. This wide potential window is possible due to the absence of solvent and its associated limits due to solvent electrolysis at high over potentials. The measurements were enabled through the development of a new reference electrode, composed of yttria stabilised zirconia (YSZ) which maintains a stable potential at 1100 K. In this paper we focus on developing a phenomenological understanding of electron transfer at the solid-gas interface, using cyclic voltammetry. The effect of working electrode surface area and material, as well as potential scan rate on the voltammetric redox features is presented. We discuss the physical origin of the observed Faradaic current peaks measured in a flame plasma electrolyte, and propose a simple model to describe the redox processes occurring. We conclude that redox processes at the solid-gas interface are actually similar to the analogous processes at the solid-liquid interface described by conventional electrochemical theory; the departures are mainly due to the mass transport processes that dominate in the gas phase. We associate migration effects with the total absence of any oxidation processes.

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Dynamic Electrochemistry in Flame Plasma Electrolyte

Cited by 12 publications

References 30 publications

Modulation of copper(I) oxide reduction/oxidation in atmospheric pressure plasma jet

Modulation of copper(I) oxide reduction/oxidation in atmospheric pressure plasma jet

Plasma Electrochemistry: Development of a Reference Electrode Material for High Temperature Plasma

Plasma electrochemistry: voltammetry in a flame plasma electrolyte

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