Shearforce positioning of nanoprobe electrode arrays for scanning electrochemical microscopy experiments

Adam, Catherine; Kanoufi, Frédéric; Šojić, Nešo; Etienne, Mathieu

doi:10.1016/j.electacta.2015.04.140

Cited by 12 publications

(11 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This progressive growth tends to a current plateau (the value of C ) traducing the overlap of the diffusion field of AuCl 4 − consumption at the gold NPs present on the pyrite surface. Indeed, a micrometric array of growing NPs will operate as a micrometric array of nanoelectrodes, which behaves as a microelectrode as long as Na spot r NP N * a spot * r NP >1 ,. This situation is actually fulfilled at 10 s based on the values of N , a spot and r NP extracted from Figure S3 (SI).…”

Section: Resultsmentioning

confidence: 91%

Scanning Electrochemical Microscopy for the Electroless Deposition of Gold on Natural Pyrite: Effect of Ferric Ions

et al. 2019

Self Cite

View full text Add to dashboard Cite

The local electroless deposition of gold on pyrite is studied by scanning electrochemical microscopy (SECM). The SECM and additional SEM experiments provide kinetic and mechanistic insights on the local galvanic replacement of pyrite by gold. We evidence that individual gold nanoparticles or full coverage of gold on the pyrite surface can be obtained by controlling either the deposition time or the flux of gold ions electrogenerated at the ultramicroelectrode. We also studied the influence of ferric ions, known to be implied on gold etching and pyrite corrosion and therefore, on the overall process of gold deposition on pyrite. We then demonstrate that the presence of ferric ions significantly modifies i) the thermodynamic of the gold electrodissolution, ii) the process of adsorption of auric ions on pyrite in the first instants, iii) the number of nucleation sites on the pyrite surface and, iv) the structure of the deposited gold layer.

show abstract

Section: Resultsmentioning

confidence: 91%

Scanning Electrochemical Microscopy for the Electroless Deposition of Gold on Natural Pyrite: Effect of Ferric Ions

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…This density is also in agreement with the possible overlapping of nanoelectrodes, expected for such density for NP dimensions of the order of 10-100nm. 33,34 When the potential comes back to more anodic regions, the optical intensities of many, but not all, NPs are decreasing, which also confirms the partial dissolution of NPs.…”

Section: Optical Monitoring Of Ag Np Growth and Dissolutionmentioning

confidence: 78%

The promise of antireflective gold electrodes for optically monitoring the electro-deposition of single silver nanoparticles

et al. 2018

Self Cite

View full text Add to dashboard Cite

The interest in nano-objects has recently dramatically increased in all fields of science, and electrochemistry is no exception. As a consequence, in situ and operando visualization of electrochemical processes is needed at the nanoscale. Herein, we propose a new interferometric microscopy based on an antireflective thin metal electrode layer. The technique is coupled to electrochemistry in a model example: the electro-deposition of Ag metallic nanoparticles (NPs). This challenges the current opto-electrochemical methods and even those relying on nano-impact detection. Indeed, the sensitivity allows the dynamic in situ visualization of the electrochemical growth and dissolution of individual Ag NPs, whose size was tracked dynamically down to 15 nm in diameter. The use of microelectrodes provides interesting quantitative analysis of the NPs, from optically resolved arrays of single NPs to condensed arrays of (unresolved) NPs. Particularly, the optical analysis of all the individual NPs allows the reconstruction of optical voltammograms similar to the electrochemical ones. Finally, the NP dissolution-redeposition is also investigated.

show abstract

“…Briefly, a 5 μm radius electrode was defined as a region in a larger quarter‐hemisphere simulation space. This configuration has previously been used to allow for 3D simulations without requiring excessive computational power . Simulated concentration gradients in the absence and presence of a catalytic particle are shown in Figure A and B, respectively.…”

Section: Resultsmentioning

confidence: 99%

Nanoimpacts at Active and Partially Active Electrodes: Insights and Limitations

Roehrich

Sepunaru

2020

Angewandte Chemie

View full text Add to dashboard Cite

While the electrochemical nanoimpact technique has recently emerged as am ethod of studying single entities,i ti s limited by requirement of ac atalytically active particle impacting an inert electrode.W es how that an active particleactive electrode can provide mechanistic insight into electrochemical reactions.W hen an individual Pt electrocatalyst adsorbs to the surface of ap artially active electrode,f urther reduction of electrode-produced species can proceed on the nanocatalyst. Current transients obtained during hydrogen evolution allow simultaneous measurement of the Pt catalyst over different length scales,s ize dependency suggests Ha tom intercalation as ac atalytic deactivation mechanism. Although results showt hat outer-sphere redoxp robes are unproductive for particle characterization, the breadth of inner-sphere electrochemical reactions makes this ap romising method for understanding the properties of catalytic nanomaterials,one at atime.

show abstract

Shearforce positioning of nanoprobe electrode arrays for scanning electrochemical microscopy experiments

Cited by 12 publications

References 55 publications

Scanning Electrochemical Microscopy for the Electroless Deposition of Gold on Natural Pyrite: Effect of Ferric Ions

Scanning Electrochemical Microscopy for the Electroless Deposition of Gold on Natural Pyrite: Effect of Ferric Ions

The promise of antireflective gold electrodes for optically monitoring the electro-deposition of single silver nanoparticles

Nanoimpacts at Active and Partially Active Electrodes: Insights and Limitations

Contact Info

Product

Resources

About