Oxide formation on Au(111) an in situ STM study

Schneeweiss, Marie Anne; Kolb, Dieter M.

doi:10.1016/s0167-2738(96)00587-5

Cited by 65 publications

(69 citation statements)

References 21 publications

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“…This is shown by the increasing amplitude of the reduction peak. The process of repeated oxidation followed by reduction is known to induce considerable roughening of the gold surface [27], which can readily explain the increase in surface area and capacitance achieved here. The nature of the cathodic reaction which started and ended at 0 V vs SCE is puzzling, but it may be related to localised pH changes around the electrodes in this unbuffered electrolyte.…”

Section: 2supporting

confidence: 53%

“…So, all else being equal, if A changes, a current will flow, even if dE/dt=0 [28]. As mentioned, when a gold electrode that has been oxidised during an anodic charge cycle is subsequently reduced, the surface immediately resulting from this action is generally very rough and porous [23,25,27,28]. The effect is exacerbated if carried out on the already porous surface of mesoporous gold.…”

Section: Electrochemistry Of Gold Ultracapacitorsmentioning

confidence: 99%

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Electrochemical capacitance of mesoporous gold

2005

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The surfaces of nanoscale gold particles and components are oxide-free under normal ambient conditions. This unusual attribute permits the exploration of microstructures and functionalities that would not be feasible for less noble metals. Here we consider the electrochemical properties of mesoporous gold sponges, prepared by de-alloying an AuAl2 precursor. The sponges have a high specific surface area, with an average pore diameter of 12 nm, but are prone to sinter. They may be prepared in bulk, or, more usefully, as coatings. Their electrochemical capacitance divided by their nominal surface area is high and, at a cell voltage of 0.6 V, reaches 100 mF/cm 2 for bulk samples and 2 mF/cm 2 for coatings. This is up to a thousand times greater than the 50 to 100 μF/cm 2 exhibited by a planar gold surface.

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Section: 2supporting

confidence: 53%

Section: Electrochemistry Of Gold Ultracapacitorsmentioning

confidence: 99%

Electrochemical capacitance of mesoporous gold

2005

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“…In situ scanning tunneling microscopy 45,46 has revealed the roughening of Au surfaces after electrochemical oxidation and reduction, specifically when the maximum potential is high enough to cause a replacement-turnover process. The roughness decays spontaneously under either open circuit or applied potential conditions.…”

Section: Roughness Decay Under Applied Potential Conditionsmentioning

confidence: 99%

Electrocapillary coupling at rough surfaces

Deng

Gosslar

Smetanin

et al. 2015

Phys. Chem. Chem. Phys.

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We investigate the impact of the surface roughness on the experimental value of the electrocapillary coupling coefficient, B. This quantity relates the response of electrode potential, E, to tangential elastic strain, e, and also measures the variation of the surface stress, f, with the superficial charge density, q. We combine experiments measuring the apparent coupling coefficient B eff for gold thin film electrodes in weakly adsorbing electrolyte with data for the surface roughness determined by atomic force microscopy and by the capacitance ratio method. We find that even moderate roughness has a strong impact on the value of B eff . Analyzing the mechanics of corrugated surfaces affords a correction scheme yielding values of B that are invariant with roughness and that agree with expectations for the true coupling coefficient on ideal, planar surfaces. The correction is simple and readily applied to experiments measuring B eff from surface stress changes in cantilever bending studies or from the potential variation in dynamic electrochemo-mechanical analysis.

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“…This data is consistent with the conventional response of a polycrystalline gold electrode in weak sulphuric acid. 14,36,50,51 The periodic surface profile of the electrode (having a groove-depth :…”

Section: Optical Measurementsmentioning

confidence: 99%