Quadruple nanoelectrode assembly for simultaneous analysis of multiple redox species and its application to multi-channel scanning electrochemical microscopy

Gwon, Hyo Jin; Lim, Donghoon; Nam, Yoonho; Ahn, Hyun S.

doi:10.1016/j.aca.2022.340287

Cited by 5 publications

(4 citation statements)

References 32 publications

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“…At present, for carbon-based supercapacitors, it is almost impossible to identify the cause of the polarization phenomenon (pseudocapacitance or corresponding HER/OER/ORR) by traditional cyclic voltammetry (CV), constant current discharge (GCD), and other electrical analysis techniques. − There is a need for sensitive in situ analysis technology that can distinguish between necessary and unnecessary reactions during charging and discharging . High-resolution SECM has emerged as a valuable tool for the rapid and sensitive evaluation of electrochemical processes in different materials. , SECM offers several advantages compared to traditional nonpositional methods: (1) It allows for direct monitoring of electrochemical processes during system operation. (2) It provides experimental evidence for speculation on the origin of observed changes, avoiding post-mortem analysis .…”

Section: Resultsmentioning

confidence: 99%

“…50−52 There is a need for sensitive in situ analysis technology that can distinguish between necessary and unnecessary reactions during charging and discharging. 53 High-resolution SECM has emerged as a valuable tool for the rapid and sensitive evaluation of electrochemical processes in different materials. 54,55 SECM offers several advantages compared to traditional nonpositional methods: (1) It allows for direct monitoring of electrochemical processes during system operation.…”

Section: Resultsmentioning

confidence: 99%

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Prompt Thermal Transfer Across the sp³–sp² Interfaces for the Enhanced Electrochemical Performance of Aqueous Carbon-Based Supercapacitors

Lu,

Xie,

Yang

et al. 2024

Ind. Eng. Chem. Res.

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The local thermal accumulation induced by the charging process of the aqueous supercapacitors will facilitate water splitting, which seriously decreases the energy density and safety of aqueous supercapacitors. Therefore, it is necessary to evacuate the heat from the active sites and identify the types of side reactions. In this study, we employ a self-assembly strategy to successfully synthesize a highly thermally conductive three-dimensional nanodiamond-reduced graphene oxide (NDs-rGO) aerogel. The NDs-rGO aerogel is used as the electrode material, which can expand the operating voltage of alkaline aqueous symmetric supercapacitors to 1.1 V, much higher than that of previously reported carbon-based symmetric supercapacitors (≤1.0 V). Moreover, we have, for the first time, utilized scanning electrochemical microscopy to confirm the beneficial role of materials with thermally conductive interfaces in dissipating heat during the charging process of supercapacitor electrodes. As a result, the aqueous NDs-rGO supercapacitor device exhibits excellent reversibility (100% capacitance retention after 10,000 cycles) and achieves an energy density of 12.2 W h kg −1 at a high working voltage of 1.1 V. The excellent electrochemical performance may be ascribed to the fact that the redox self-assembly process in NDs-rGO creates high thermal-conductivity heterogeneous interfaces between sp 2 −sp 3 structures, enabling rapid heat dissipation during the charging process, suppressing water splitting, and thus increasing the working voltage of the supercapacitors.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Prompt Thermal Transfer Across the sp³–sp² Interfaces for the Enhanced Electrochemical Performance of Aqueous Carbon-Based Supercapacitors

Lu,

Xie,

Yang

et al. 2024

Ind. Eng. Chem. Res.

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“…Ahn et al constructed a nanoelectrode array containing four nanoelectrodes, each with a diameter of 100-400 nm. [52] The fabrication method involves the laser-assisted pulling of a quad-barrel glass capillary with enclosed platinum wires into each barrel (Figure 2b-iii).…”

Section: Types Of Electrode Arrays and Their Fabrication Methodsmentioning

confidence: 99%

Electrochemical Biosensor Arrays for Multiple Analyte Detection

Sen,

Lazenby

2023

Analysis & Sensing

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The simultaneous detection of multiple analytes using electrochemical biosensor arrays has demonstrated significant potential in various fields, including medical diagnostics. These platforms are designed to be low‐cost, easy to use, and offer fast detection of a range of molecules. This concept article discusses the components necessary to achieve multiplexing with electrochemical biosensor arrays. The various methods used to fabricate electrode arrays of different types are discussed. Furthermore, the methods for the selective immobilization of multiple different bioreceptors onto individual electrodes within the array, a crucial step essential for conferring specificity to the analytical processes, are presented with relevant examples. We have focused on enzymes, antibodies and aptamers as examples of bioreceptors that have been deployed in various multianalyte electrochemical detection platforms. Finally, we discuss the key challenges associated with their application for the analysis of real samples and provide a future outlook on possible strategies that can be used to overcome these challenges.

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“…In this work, we developed a method to modify selected electrode surfaces with desired aptamers, enabling the detection of multiple analyte molecules simultaneously. This approach would allow us to take advantage of an electrochemical sensor array, composed of multiple sensing electrodes in a single device. − We selectively modified electrode surfaces with thiolated aptamers of different single-stranded DNA sequences, by adsorption of one aptamer onto the electrode surfaces, followed by complete removal by electrodesorption at a sufficiently negative potential. The same surface can then be modified with another aptamer sequence, enabling multiple different aptamers to be used on the surfaces of closely spaced microelectrodes.…”

mentioning

confidence: 99%

Selective Aptamer Modification of Au Surfaces in a Microelectrode Sensor Array for Simultaneous Detection of Multiple Analytes

Sen

Lazenby

2023

Anal. Chem.

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Aptamers have been employed as the biorecognition element in electrochemical aptamer-based (E-AB) biosensors, for the detection of a diverse range of analyte molecules, on electrodes with sizescales ranging from a few microns to several millimeters. Simultaneous detection of multiple different analytes requires the selective modification of multiple electrode surfaces with different aptamers. This process is typically achieved by incubating separate macroscale electrodes in a solution with the desired aptamer, which is unsuitable for microelectrode arrays in which the electrodes are closely spaced. In this work, we selectively modified electrode surfaces with thiolated aptamers of different single-stranded DNA sequences, by successive removal and addition of thiol monolayers. This was achieved by electrodesorption of thiol monolayers using controlled potential, to expose unmodified gold electrodes to be modified with a different thiolated aptamer, thus enabling multiple different aptamers to be used on the surfaces of closely spaced microelectrodes. All aptamers were methylene blue terminated, allowing redox currents to be measured and used to monitor aptamer probe packing density on the electrode surface and the selectivity of the sensors. Here, we demonstrate the microscale E-AB sensor multianalyte detection method using aptamers for target analytes, adenosine triphosphate, dopamine, and serotonin, which can ultimately be applied to perform localized simultaneous detection using electrode arrays.

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Quadruple nanoelectrode assembly for simultaneous analysis of multiple redox species and its application to multi-channel scanning electrochemical microscopy

Cited by 5 publications

References 32 publications

Prompt Thermal Transfer Across the sp³–sp² Interfaces for the Enhanced Electrochemical Performance of Aqueous Carbon-Based Supercapacitors

Prompt Thermal Transfer Across the sp³–sp² Interfaces for the Enhanced Electrochemical Performance of Aqueous Carbon-Based Supercapacitors

Electrochemical Biosensor Arrays for Multiple Analyte Detection

Selective Aptamer Modification of Au Surfaces in a Microelectrode Sensor Array for Simultaneous Detection of Multiple Analytes

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Quadruple nanoelectrode assembly for simultaneous analysis of multiple redox species and its application to multi-channel scanning electrochemical microscopy

Cited by 5 publications

References 32 publications

Prompt Thermal Transfer Across the sp3–sp2 Interfaces for the Enhanced Electrochemical Performance of Aqueous Carbon-Based Supercapacitors

Prompt Thermal Transfer Across the sp3–sp2 Interfaces for the Enhanced Electrochemical Performance of Aqueous Carbon-Based Supercapacitors

Electrochemical Biosensor Arrays for Multiple Analyte Detection

Selective Aptamer Modification of Au Surfaces in a Microelectrode Sensor Array for Simultaneous Detection of Multiple Analytes

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Prompt Thermal Transfer Across the sp³–sp² Interfaces for the Enhanced Electrochemical Performance of Aqueous Carbon-Based Supercapacitors

Prompt Thermal Transfer Across the sp³–sp² Interfaces for the Enhanced Electrochemical Performance of Aqueous Carbon-Based Supercapacitors