Electrode emersion and the double layer

Hansen, Wilford N.; Wang, C.L.; Humphryes, T.W.

doi:10.1016/s0022-0728(78)80149-1

Cited by 44 publications

(8 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the work function of dry LbL films is measured; therefore, we must consider how the charge distribution described above changes upon drying. X-ray photoelectron spectroscopy and conductance experiments have shown that drying a charged substrate collapses the counterions of the diffuse ionic layer onto the surface . On the basis of this result, we propose that drying the LbL film condenses the counterions onto the charges of the topmost layer, partially neutralizing them.…”

Section: Resultsmentioning

confidence: 84%

Simplified Approach to Work Function Modulation in Polyelectrolyte Multilayers

et al. 2017

View full text Add to dashboard Cite

The layer-by-layer (LbL) method is based on sequential deposition of polycations and polyanions. Many of the properties of polyelectrolyte thin films deposited via this method depend on the nature of the topmost layer. Thus, these properties show odd-even oscillations during multilayer growth as the topmost layer alternates from polycations to polyanions. The work function of a (semi)conductive substrate modified with an LbL polyelectrolyte multilayer also displays an oscillatory behavior independent of film thickness. The topmost layer modulates the work function of a substrate buried well below the film. In agreement with previous observations, in this work, we show that the work function of a gold substrate changes periodically with the number of adsorbed layers, as different combinations of polycations and polyanions are deposited using the LbL method. For the first time, we rationalize this behavior in terms of formation of a dipole layer between the excess charge at the topmost layer and the charge of the metal substrate, and we put forward a semiquantitative model based on a continuum description of the electrostatics of the system that reproduces the experimental observations.

show abstract

Section: Resultsmentioning

confidence: 84%

Simplified Approach to Work Function Modulation in Polyelectrolyte Multilayers

et al. 2017

View full text Add to dashboard Cite

show abstract

“…It is now well established that when an electrode is emersed from the electrolyte under potential control at a potential in the double-layer region, it retains its electrochemical double layer. This was first demonstrated in 1978 by means of conductance and XPS measurements of very thin (tens of nanometers) Au and SnO 2 film electrodes . The XPS results have been confirmed and extended. , Furthermore, work function measurements showed that, as was to be expected, in the potential region of ideal polarizability the slope of the work function vs electrode potential plot was a straight line of unity slope, since the electrode potential is simply the electrochemical potential of the electron in the electrode, or Fermi level, and the work function is the potential difference between the Fermi and vacuum levels.…”

Section: Introductionmentioning

confidence: 69%

Simple Electrocatalytic Proof of the Intact Emersion of the Electrochemical Double Layer

et al. 1997

View full text Add to dashboard Cite

“…It is worth noting that the work of Hansen, Kolb, Kötz, and co-workers with emersed electrodes has shown that the double layer structure is retained after electrode emersion as well. − Consequently, the double layer is expected to exist, more or less, unperturbed over the gas-exposed catalyst electrode surface as well.…”

Section: Resultsmentioning

confidence: 99%

Non-Faradaic Electrochemical Modification of the Catalytic Activity of Pt for H₂ Oxidation in Aqueous Alkaline Media

et al. 1996

View full text Add to dashboard Cite

The heterogeneous catalytic oxidation of H2 on Pt was investigated on Pt black and Pt−graphite electrodes, also serving as heterogeneous catalysts, in aqueous alkaline solutions as a function of electrode potential and current. Hydrogen−oxygen mixtures were bubbled over the surface of the Pt electrode through a porous Teflon frit, and the rates of H2 and O2 consumption were measured via on-line mass spectrometry and gas chromatography. It was found that positive current application enhances the catalytic rate of H2 oxidation by up to 500% and that the increase in the catalytic rate is up to 100 times larger than the increase I/2F of the electrocatalytic rate corresponding to Faraday's law. The results show that the heterogeneously catalyzed H2 oxidation proceeds in parallel with the electrocatalytic anodic H2 oxidation and that its rate is markedly affected by the catalyst potential and work function. This electrochemically induced and controlled reversible promotion of the catalytic properties of Pt bears many similarities to the effect of electrochemical promotion when using solid electrolytes and can be rationalized by considering the effect of varying potential and work function on the coverages and binding strengths of dissociatively chemisorbed hydrogen and oxygen.

show abstract

Electrode emersion and the double layer

Cited by 44 publications

References 3 publications

Simplified Approach to Work Function Modulation in Polyelectrolyte Multilayers

Simplified Approach to Work Function Modulation in Polyelectrolyte Multilayers

Simple Electrocatalytic Proof of the Intact Emersion of the Electrochemical Double Layer

Non-Faradaic Electrochemical Modification of the Catalytic Activity of Pt for H₂ Oxidation in Aqueous Alkaline Media

Contact Info

Product

Resources

About

Electrode emersion and the double layer

Cited by 44 publications

References 3 publications

Simplified Approach to Work Function Modulation in Polyelectrolyte Multilayers

Simplified Approach to Work Function Modulation in Polyelectrolyte Multilayers

Simple Electrocatalytic Proof of the Intact Emersion of the Electrochemical Double Layer

Non-Faradaic Electrochemical Modification of the Catalytic Activity of Pt for H2 Oxidation in Aqueous Alkaline Media

Contact Info

Product

Resources

About

Non-Faradaic Electrochemical Modification of the Catalytic Activity of Pt for H₂ Oxidation in Aqueous Alkaline Media