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Related Concept Videos

Voltammetry: Overview01:20

Voltammetry: Overview

2.1K
Voltammetry is an electroanalytical technique in which the current flowing through an electrochemical cell is measured as a function of applied potential, typically under conditions of concentration polarization. The technique provides valuable information about redox-active species, and the current response is plotted as a voltammogram.
A voltammetric cell uses three electrodes: a working electrode, a reference electrode, and an auxiliary electrode. The redox reactions occur in the working...
2.1K
Voltammetric Techniques: Linear-Scan (E vs Time)01:12

Voltammetric Techniques: Linear-Scan (E vs Time)

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Polarography is a classical voltammetric technique used to analyze electrochemical reactions. This method applies a linear potential sweep to a dropping mercury electrode (DME), and the resulting current is measured. A dropping mercury electrode is commonly used as the working electrode in polarography. It consists of a capillary tube filled with mercury, where the tiny droplet forms at the tip. This droplet continuously drops from the capillary, creating a new electrode surface for each...
556
Voltammetry: Factors Affecting Measurements01:21

Voltammetry: Factors Affecting Measurements

226
A current produced due to the redox reactions of the analyte at the working and auxiliary electrodes is called a faradaic current. The reaction can be divided into two types. The current generated due to the reduction of the analyte is called cathodic current, and it carries a positive charge. In contrast, the current produced by analyte oxidation is known as an anodic current, and it has a negative charge. The applied potential at the working electrode determines the faradaic current flow, and...
226
Voltammetric Techniques: Pulse Voltammetry01:17

Voltammetric Techniques: Pulse Voltammetry

759
Differential-pulse voltammetry (DPV) is a type of voltammetry that involves applying a series of voltage pulses to an electrochemical cell while measuring the resulting current. In DPV, the differential pulse or small potential pulses are superimposed on a linear potential sweep. The magnitude of these pulses is typically small, often in the millivolt range. Each voltage pulse lasts a short duration, usually in the order of a few milliseconds, and is applied at regular intervals along the...
759
Voltammetry: Stripping Methods01:13

Voltammetry: Stripping Methods

414
Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
414
Amperometry: Overview01:10

Amperometry: Overview

849
Amperometry is a technique commonly used to measure the concentration of specific analytes in a solution by monitoring the electric current generated during an electrochemical reaction. It involves applying a constant potential between a working electrode and a reference electrode to measure the resulting current, which is proportional to the concentration of the analyte. The Clark oxygen electrode operates based on this principle of amperometry. It consists of a cathode and an anode enclosed...
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A Protocol for Electrochemical Evaluations and State of Charge Diagnostics of a Symmetric Organic Redox Flow Battery
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Real-time Voltammetric Anion Sensing Under Flow.

Sophie C Patrick1, Robert Hein1, Mohamed Sharafeldin1

  • 1Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 27, 2021
PubMed
Summary

This study introduces a 3D-printed microfluidic system for real-time anion sensing using voltammetry. The novel approach enhances detection limits and enables continuous monitoring for practical ion sensor applications.

Keywords:
halogen bondingion sensingmicrofluidic sensingsensorsvoltammetry

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Area of Science:

  • Electrochemistry
  • Analytical Chemistry
  • Materials Science

Background:

  • Developing reusable and long-term ion sensors for real-world applications is challenging.
  • Voltammetric sensing offers potential but requires robust and sensitive methodologies.
  • Microfluidic systems provide platforms for miniaturized and automated chemical analysis.

Purpose of the Study:

  • To demonstrate real-time voltammetric sensing of anions in a continuous flow using a 3D-printed microfluidic system.
  • To improve the sensitivity and temporal resolution of ion detection.
  • To advance the translation of voltammetric ion sensors for practical use.

Main Methods:

  • Fabrication of a 3D-printed microfluidic device.
  • Development of electro-active sensory interfaces utilizing halogen bonding (XB) and hydrogen bonding (HB) with ferrocene-isophthalamide-(iodo)triazole films.
  • Real-time anion detection via square-wave voltammetry (SWV) under continuous flow.
  • Automated data processing of SWV scans using a custom MATLAB script.

Main Results:

  • Achieved real-time, continuous flow voltammetric sensing of anions.
  • Demonstrated over a tenfold improvement in the limit of detection through automated data processing.
  • Enabled high temporal resolution measurements by tuning analysis parameters.
  • Proof-of-concept for a robust and repeatable sensing methodology.

Conclusions:

  • The developed 3D-printed microfluidic system with tailored sensory interfaces facilitates efficient real-time anion detection.
  • Automated data analysis significantly enhances sensor performance, improving limits of detection and temporal resolution.
  • This methodology represents a significant step towards practical, long-term ion monitoring applications.