Electrochemical noise study of the effect of electrode surface wetting on the evolution of electrolytic hydrogen bubbles

Bouazaze, H.; Cattarin, Sandro; Huet, François; Musiani, Marco; Nogueira, R.P.

doi:10.1016/j.jelechem.2006.08.003

Cited by 20 publications

(13 citation statements)

References 29 publications

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“…Square 2.25 cm 2 copper electrodes bordered with epoxy resin were covered with a cathodic deposit of Ni-PTFE composite. The cell was cubic and contained 0.75 L of the bath proposed by Bouazaze et al [23]. The bath is composed of a PTFE suspension supplied by Aldrich (60% mass) and of a solution of NiSO 4 0.26 mol L -1 , H 3 BO 3 0.11 mol L -1 , NH 4 Cl 0.11 mol L -1 , Triton X100 0.01 mol L -1 in water at pH 6.…”

Section: Hydrophobic Electrode Preparation and Testingmentioning

confidence: 99%

“…On flat electrodes, artificial cavities or the border of the electrode can be used to obtain repeatable bubbles [19][20] in small number and with small size at detachment. Electrodes on which the average bubble size at detachment is controlled have been reported [21][22][23] but the exact number of bubbles and the size of each bubble were not known.…”

Section: Introductionmentioning

confidence: 99%

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Controlled electrochemical gas bubble release from electrodes entirely and partially covered with hydrophobic materials

Brussieux

Viers

Roustan

et al. 2011

Electrochimica Acta

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This paper deals with an experimental study on millimetre-size electrochemically evolved hydrogen bubbles. A method to generate gas bubbles controlled in number, size at detachment and place on a flat electrode is reported.Partially wetted composite islands are implemented on a polished metal substrate.As long as the island size is lower than a limit depending on its wettability, only one bubble spreads on the island and its size at detachment is controlled by the island perimeter. The composite, a metal-polytetrafluoroethylene (Ni-PTFE), is obtained by an electrochemical co-deposition process. On the contrary to predictions of available models for co-deposition, at current densities beyond Ni 2+ limiting current density, the mass ratio of PTFE in the deposit strongly increases. A mechanism is proposed to describe co-deposition when hydrogen bubbles are co-evolved. The observation of gas evolution on fully hydrophobic electrodes highlights the fact that bubbles growth rate on such electrodes differs from growth rates when bubble growth is controlled by mass transport of dissolved gas. The more a bubble grows by coalescence the more its foot expands on the electrode the bigger its size at detachment. This triple line creeping mechanism explains why, when attached bubbles coalesce many times before detaching, their size at detachment increases with current density.2

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Section: Hydrophobic Electrode Preparation and Testingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Controlled electrochemical gas bubble release from electrodes entirely and partially covered with hydrophobic materials

Brussieux

Viers

Roustan

et al. 2011

Electrochimica Acta

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show abstract

“…Bubble management is an important issue in water electrolysis process, and has aroused many attentions in recent years [9,10]. A series of researches have shown that a superposed magnetic field has significant influence on the gas involved electrolysis process [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen bubble growth at micro-electrode under magnetic field

Liu

Pan

Huang

et al. 2015

Journal of Electroanalytical Chemistry

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“…The inset illustrates that current responses were not stable even for 50 s. These fluctuations are ascribed to electrolysis bubbles, which block electrode surfaces, increase electrolyte solution resistance, and induce secondary hydrodynamic flow patterns in microchannels and chambers . The large current drops shown in some measurements, such as 3000–3600 and 4200–4800 s, are attributed to larger bubbles covering substantial electrode surface area , as discussed later. Figure A illustrates that currents varied wildly within and from cycle to cycle; these overall irreproducible responses can be explained by nonuniform bubble generation and behavior even in the same operating conditions .…”

Section: Resultsmentioning

confidence: 91%

“…Coalescence of two neighboring bubbles in Fig. C would decrease the electrode surface screened and result in a sudden increase in current , but not back to the bubble‐free value. After coalescence, the bubble kept growing, again decreasing the current.…”

Section: Resultsmentioning

confidence: 99%

Improving electrokinetic microdevice stability by controlling electrolysis bubbles

2014

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The voltage-operating window for many electrokinetic microdevices is limited by electrolysis gas bubbles that destabilize microfluidic system causing noise and irreproducible responses above ∼3 V DC and less than ∼1 kHz AC at 3 Vpp. Surfactant additives, SDS and Triton X-100, and an integrated semipermeable SnakeSkin® membrane were employed to control and assess electrolysis bubbles from platinum electrodes in a 180 by 70 μm, 10 mm long microchannel. Stabilized current responses at 100 V DC were observed with surfactant additives or SnakeSkin® barriers. Electrolysis bubble behaviors, visualized via video microscopy at the electrode surface and in the microchannels, were found to be influenced by surfactant function and SnakeSkin® barriers. Both SDS and Triton X-100 surfactants promoted smaller bubble diameters and faster bubble detachment from electrode surfaces via increasing gas solubility. In contrast, SnakeSkin® membranes enhanced natural convection and blocked bubbles from entering the microchannels and thus reduced current disturbances in the electric field. This data illustrated that electrode surface behaviors had substantially greater impacts on current stability than microbubbles within microchannels. Thus, physically blocking bubbles from microchannels is less effective than electrode functionalization approaches to stabilize electrokinetic microfluidic systems.

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Electrochemical noise study of the effect of electrode surface wetting on the evolution of electrolytic hydrogen bubbles

Cited by 20 publications

References 29 publications

Controlled electrochemical gas bubble release from electrodes entirely and partially covered with hydrophobic materials

Controlled electrochemical gas bubble release from electrodes entirely and partially covered with hydrophobic materials

Hydrogen bubble growth at micro-electrode under magnetic field

Improving electrokinetic microdevice stability by controlling electrolysis bubbles

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