Effect of Electrochemical Oxidation-Reduction Cycles on Surface Structures and Electrocatalytic Oxygen Reduction Activity of Au Electrodes

Lim, Taejung; Kim, Jong-Won

doi:10.5012/jkcs.2016.60.5.310

Cited by 4 publications

(5 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A similar phenomenon was also found in the study of the roughened surface for optical application as surface-enhanced Raman spectroscopy (SERS) substrate [30,33]. It also indicated that when the degree of oxidation-reduction in the gold surface became greater, the surface changes became more rapid, thus resulting in a swifter enhancement of oxygen reduction catalytic activity [34]. Precipitation and ionization in the solution may occur.…”

Section: Orc Treatment and Mechanismsupporting

confidence: 64%

“…Polishing treatment had significantly generated more uniform Au particles size and density after ORC treatment by the average height of about 50-100 nm and the length of approximately 50-150 nm over the Au substrate (Figure 3C). The outcomes signify the crucial role of polishing and cleaning the substrate to create a homogenous foundation and particle size control for Au growth [34]. Moreover, the largely homogenous surface resulting from polishing facilitates the well-scattered penetration of Au ions during the electrochemical ORC, where such actions will likely be hindered in the randomly roughened and dirty non-polished surface.…”

Section: Morphological and Topological Studies Of The Orc Engineered ...mentioning

confidence: 99%

See 1 more Smart Citation

Sensing Alzheimer’s Disease Utilizing Au Electrode by Controlling Nanorestructuring

et al. 2022

View full text Add to dashboard Cite

This paper reports the development of Alzheimer’s disease (AD) sensor through early detection of amyloid-beta (Aβ) (1–42) using simple nanorestructuring of Au sheet plate by oxidation-reduction cycle (ORC) via the electrochemical system. The topology of Au substrates was enhanced through the roughening and Au grains grown by a simple ORC technique in aqueous solutions containing 0.1 mol/L KCl electrolytes. The roughened substrate was then functionalized with the highly specific antibody β-amyloid Aβ (1–28) through HS-PEG-NHS modification, which enabled effective and direct detection of Aβ (1–42) peptide. The efficacy of the ORC method had been exhibited in the polished Au surface by approximately 15% larger electro-active sites compared to the polished Au without ORC. The ORC polished structure demonstrated a rapid, accurate, precise, reproducible, and highly sensitive detection of Aβ (1–42) peptide with a low detection limit of 10.4 fg/mL and a wide linear range of 10−2 to 106 pg/mL. The proposed structure had been proven to have potential as an early-stage Alzheimer’s disease (AD) detection platform with low-cost fabrication and ease of operation.

show abstract

Section: Orc Treatment and Mechanismsupporting

confidence: 64%

Section: Morphological and Topological Studies Of The Orc Engineered ...mentioning

confidence: 99%

Sensing Alzheimer’s Disease Utilizing Au Electrode by Controlling Nanorestructuring

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The SEM image of the as‐synthesized aAuNPs (without purification) is shown in SI Figure S2. Purified nanotriangles form a specific arrangement, in which many electrochemically active edges are exposed to the electrolyte solution . Appropriate centrifuging programme allowed to remove most of the colloidal gold from the solution, SI Figure S3, S4.…”

Section: Methodsmentioning

confidence: 99%

“…This procedure-oxidation-reduction cycling (ORC)-is known as an excellent mean for activation of electrode surface without changing its topography. Although the corners of nanoplates round slightly during the process, such structural changes do not diminish the oxygen reduction reaction catalytic activity [33].…”

Section: Cyclic Voltammetric Characterization Of Electrodesmentioning

confidence: 99%

Catalytic Activity of Anisotropic Gold Nanoplates towards Oxygen Reduction

Opuchlik

Kizling²,

Bącal

et al. 2019

Electroanalysis

View full text Add to dashboard Cite

Glassy carbon electrode (GCE) coated with anisotropic gold nanoplates (aAuNPs) was used for the study of oxygen reduction reaction (ORR) in 0.5 M sulfuric acid instead of bulk gold electrodes. The electrode cleaning/activation procedure lead to the removal of any charged and uncharged residues on the gold nanoplates, leaving the nanostructured surface highly active towards oxygen reduction. The advantages: much lower overpotential and larger current densities of oxygen reduction are ascribed to the unique nanostructures present on the carbon electrode surface‐the gold nanoplates. They are rich in edges providing a large population of Au (100) sites with unsaturated coordination exposed to the solution, and catalytically active. Measurements performed using a rotating disc electrode, modified with the gold nanoplates, confirmed that ORR proceeds via two separate steps: oxygen is reduced to hydrogen peroxide, and the peroxide is further reduced in a two‐electron reduction to water.

show abstract

“…6 Hence, both the "oxide layer" itself and the restructured metal surface after subsequent reduction of the surface oxide 4,5,[9][10][11][12] may modify electrocatalytic activities for given reactions. [13][14][15] Electro-oxidation of single crystalline and polycrystalline Au electrodes in different environments has been studied both electrochemically, [16][17][18][19][20][21][22][23][24] spectroscopically, 7,11,12,[25][26][27][28] and with imaging methods. 5,7,25,27,[29][30][31][32][33][34] Metal surfaces can be analyzed under ultrahigh vacuum (UHV) conditions and characterized using surface analytic techniques that are not accessible under atmospheric pressure like scanning electron microscopy (SEM) or low energy electron diffraction (LEED).…”

mentioning

confidence: 99%

Au(111) Surface Oxidation Kinetics Probed by Electrocatalytic Oxidation of Formic Acid

Matzik¹,

Hermann²,

Kibler³

et al. 2022

J. Electrochem. Soc.

View full text Add to dashboard Cite

The kinetics of surface oxidation for Au(111) in 0.1 M HCOOH + 0.1 M HClO4 was studied at 20°C utilizing the electrocatalytic formic acid oxidation reaction (FAOR). In the surface oxidation region, cyclic voltammetry shows a distinct dependence of FAOR on scan rate revealing simultaneous deactivation of active surface sites. The surface oxide is essentially inactive for the FAOR. A series of current-time curves was recorded after potential steps into the potential range between 0.65 and 1.00 V vs. saturated mercury-mercurous sulfate electrode and analyzed within a three-step surface oxidation model, which successively involves (i) adsorption at surface defects, (ii) adsorption on well-defined Au(111) terraces, and (iii) two-dimensional nucleation-and-growth on terraces. Although Au surface oxidation is by far more complex, the system can be described in terms of the intrinsic activity of the Au(111) surface and the oxide coverage. The chronoamperometric measurements can be modeled without considering the interaction of the oxide species with the FAOR and the co-adsorption of anions. The potential dependence of the kinetic parameters is used to obtain theoretical current-time curves for FAOR on Au(111). This study sheds light on the "fast FAOR" and contributes to the understanding of degradation phenomena in electrocatalysis

show abstract

Effect of Electrochemical Oxidation-Reduction Cycles on Surface Structures and Electrocatalytic Oxygen Reduction Activity of Au Electrodes

Cited by 4 publications

References 17 publications

Sensing Alzheimer’s Disease Utilizing Au Electrode by Controlling Nanorestructuring

Sensing Alzheimer’s Disease Utilizing Au Electrode by Controlling Nanorestructuring

Catalytic Activity of Anisotropic Gold Nanoplates towards Oxygen Reduction

Au(111) Surface Oxidation Kinetics Probed by Electrocatalytic Oxidation of Formic Acid

Contact Info

Product

Resources

About