scholarly journals Spatially Resolved Detection of a Nanometer-Scale Gap by Scanning Electrochemical Microscopy

2009 ◽  
Vol 81 (12) ◽  
pp. 4788-4791 ◽  
Author(s):  
Eunkyoung Kim ◽  
Jiyeon Kim ◽  
Shigeru Amemiya
Keyword(s):  
Scanning Electrochemical Microscopy ◽  
Nanometer Scale ◽  
Spatially Resolved ◽  
Electrochemical Microscopy

scholarly journals Use of Amperometric and Potentiometric Probes in Scanning Electrochemical Microscopy for the Spatially-Resolved Monitoring of Severe Localized Corrosion Sites on Aluminum Alloy 2098-T351

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1132 ◽  
Author(s):  
Rejane M. P. da Silva ◽  
Javier Izquierdo ◽  
Mariana X. Milagre ◽  
Abenchara M. Betancor-Abreu ◽  
Isolda Costa ◽  
...  
Keyword(s):  
Scanning Electrochemical Microscopy ◽  
Oxygen Depletion ◽  
Localized Corrosion ◽  
Alloy Surface ◽  
Al Alloy ◽  
Spatially Resolved ◽  
Lower Oxygen ◽  
Local Ph ◽  
Electrochemical Microscopy

Amperometric and potentiometric probes were employed for the detection and characterization of reactive sites on the 2098-T351 Al-alloy (AA2098-T351) using scanning electrochemical microscopy (SECM). Firstly, the probe of concept was performed on a model Mg-Al galvanic pair system using SECM in the amperometric and potentiometric operation modes, in order to address the responsiveness of the probes for the characterization of this galvanic pair system. Next, these sensing probes were employed to characterize the 2098-T351 alloy surface immersed in a saline aqueous solution at ambient temperature. The distribution of reactive sites and the local pH changes associated with severe localized corrosion (SLC) on the alloy surface were imaged and subsequently studied. Higher hydrogen evolution, lower oxygen depletion and acidification occurred at the SLC sites developed on the 2098-T351 Al-alloy.

Nanometer Scale Scanning Electrochemical Microscopy Instrumentation

2016 ◽  
Vol 88 (20) ◽  
pp. 10284-10289 ◽  
Author(s):  
Jiyeon Kim ◽  
Christophe Renault ◽  
Nikoloz Nioradze ◽  
Netzahualcóyotl Arroyo-Currás ◽  
Kevin C. Leonard ◽  
...  
Keyword(s):  
Scanning Electrochemical Microscopy ◽  
Nanometer Scale ◽  
Electrochemical Microscopy

scholarly journals Scanning electrochemical microscopy screening of CO2 electroreduction activities and product selectivities of catalyst arrays

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Francis D. Mayer ◽  
Pooya Hosseini-Benhangi ◽  
Carlos M. Sánchez-Sánchez ◽  
Edouard Asselin ◽  
Előd L. Gyenge
Keyword(s):  
Machine Learning ◽  
Cyclic Voltammetry ◽  
Catalytic Activity ◽  
Scanning Electrochemical Microscopy ◽  
Spatially Resolved ◽  
Co2 Electroreduction ◽  
Further Development ◽  
Activity Information ◽  
Electrochemical Microscopy

Abstract The electroreduction of CO2 is one of the most investigated reactions and involves testing a large number and variety of catalysts. The majority of experimental electrocatalysis studies use conventional one-sample-at-a-time methods without providing spatially resolved catalytic activity information. Herein, we present the application of scanning electrochemical microscopy (SECM) for simultaneous screening of different catalysts forming an array. We demonstrate the potential of this method for electrocatalytic assessment of an array consisting of three Sn/SnOx catalysts for CO2 reduction to formate (CO2RF). Simultaneous SECM scans with fast scan (1 V s−1) cyclic voltammetry detection of products (HCOO−, CO and H2) at the Pt ultramicroelectrode tip were performed. We were able to consistently distinguish the electrocatalytic activities of the three compositionally and morphologically different Sn/SnOx catalysts. Further development of this technique for larger catalyst arrays and matrices coupled with machine learning based algorithms could greatly accelerate the CO2 electroreduction catalyst discovery.

Local electrochemical activity of transition metal dichalcogenides and their heterojunctions on 3D-printed nanocarbon surfaces

Nanoscale ◽  
2021 ◽  
Author(s):  
Katarina A. Novčić ◽  
Christian Iffelsberger ◽  
Siowwoon Ng ◽  
Martin Pumera
Keyword(s):  
Transition Metal ◽  
Electrochemical Performance ◽  
Transition Metal Dichalcogenides ◽  
Scanning Electrochemical Microscopy ◽  
Electrochemical Activity ◽  
Thermally Activated ◽  
Metal Dichalcogenides ◽  
3D Printed ◽  
Electrochemical Microscopy

MoS2 and WS2 and their heterojunctions are used to modify thermally activated 3D-printed nanocarbon structures. Herein, the local electrochemical performance for HER of the modified structures is demonstrated by scanning electrochemical microscopy.

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