Au(111) - \(0.1 \; \mathrm{M}\) \(\ce{ KClO4 }\) + \(0.001 \; \mathrm{M}\) \(\ce{ KOH }\) + \(0.001 \; \mathrm{M}\) \(\ce{ KI }\)

echemdb identifier: chen_1999_iodide_342_f1a_solid
tags: BCV

A cyclic voltammogramm for Au(111) recorded in \(0.1 \; \mathrm{M}\) \(\ce{ KClO4 }\) + \(0.001 \; \mathrm{M}\) \(\ce{ KOH }\) + \(0.001 \; \mathrm{M}\) \(\ce{ KI }\) at a scan rate of \(10 \; \mathrm{mV\,s^{-1}}\) from Figure 1a in A. Chen et al. Iodide Adsorption at the Au\(111\) Electrode Surface. Journal of Electroanalytical Chemistry, 467\(1\):342–353, June 1999. [doi:10.1016/S0022-0728\(98\)00437-9](https://doi.org/10.1016/S0022-0728(98)00437-9).

Further information

The figure shows digitized data.

Preparation procedure not available.

Comment left by the curator on the published figure Estimated the concentration of the KOH solution, necessary to adjust the pH..

Metadata

Details on the electrochemical system (yaml)

electrodes:
- function: reference electrode
  name: REF
  type: SCE-sat
- crystallographicOrientation: '111'
  function: working electrode
  material: Au
  name: WE
  shape:
    diameter:
      unit: mm
      value: 3
    type: cylinder
  source:
    manufacturer: homemade
electrolyte:
  components:
  - concentration:
      unit: "mol l\u207B\xB9"
      value: 0.1
    name: KClO4
    source:
      purity:
        grade: ACS Certified
      supplier: Fisher
    type: salt
  - comment: Estimated the concentration necessary to adjust pH.
    concentration:
      unit: "mmol l\u207B\xB9"
      value: 1
    name: KOH
    source:
      purity:
        grade: Suprapure
      supplier: Merck
    type: salt
  - name: H2O
    proportion:
      unit: volume percent
      value: 100
    purity:
      totalIonConductivity:
        unit: MOhm cm
        value: 18.3
    source:
      purity:
        grade: ultrapure water
      refinement: Milli-Q plus UV
    type: solvent
  - concentration:
      unit: "mmol l\u207B\xB9"
      value: 1
    name: KI
    source:
      purity:
        unit: percent
        value: 99.99
      supplier: Aldrich
    type: salt
  ph:
    value: 11
  temperature:
    uncertainty:
      value: 2
    unit: deg_C
    value: 20
  type: aqueous
type: electrochemical

Citation key (bibtex)

@article{chen_1999_iodide_342,
    author = "Chen, Aicheng and Shi, Zhichao and Bizzotto, Dan and Lipkowski, Jacek and Pettinger, Bruno and Bilger, Christoph",
    title = "Iodide Adsorption at the {{ Au }}(111) Electrode Surface",
    year = "1999",
    month = "June",
    journal = "Journal of Electroanalytical Chemistry",
    volume = "467",
    number = "1",
    pages = "342--353",
    issn = "1572-6657",
    doi = "10.1016/S0022-0728(98)00437-9",
    abstract = "The adsorption of iodide at a Au(111) single crystal electrode has been investigated quantitatively using chronocoulometry. By analyzing the charge density data thermodynamically, the following parameters were determined: the Gibbs excess, Gibbs energy of adsorption, the number of electrons flowing to the interface per one adsorbed iodide ion at a constant electrode potential (electrosorption valency), and at a constant chemical potential. The thermodynamic data for iodide adsorption were compared to the results for bromide and chloride adsorption. All the three halides form a chemisorption bond with the gold surface. The bond is quite polar at the negatively charged surface, however, its polarity drops significantly at the positively charged surface. At low charge densities and coverages, the bond polarity is determined by the ability of free electrons to screen the dipole formed by the adsorbed anion and its image charge in the metal. At high charge densities and coverages, the chemisorption bond has a predominantly covalent character. The strength of the halide adsorption and the covalent character of the chemisorption bond increase progressively by moving from chloride to iodide."
}

Details about the original figure in the publicaton (yaml).

comment: Estimated the concentration of the KOH solution, necessary to adjust the
  pH..
fields:
- name: E
  orientation: horizontal
  reference: SCE
  type: number
  unit: V
- name: j
  orientation: vertical
  type: number
  unit: "\xB5A cm\u207B\xB2"
measurementType: CV
scanRate:
  unit: mV / s
  value: 10.0
simultaneousMeasurements: []
type: digitized

Details about the curation process of this entry (yaml).

process:
- date: '2024-06-15'
  name: Johannes M. Hermann
  orcid: https://orcid.org/0000-0001-7119-1295
  role: curator

---