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Related Concept Videos

Voltammetric Techniques: Pulse Voltammetry01:17

Voltammetric Techniques: Pulse Voltammetry

657
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...
657
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Voltammetry: Overview01:20

Voltammetry: Overview

1.9K
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...
1.9K
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

884
Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
884
Voltammetry: Factors Affecting Measurements01:21

Voltammetry: Factors Affecting Measurements

199
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...
199
Voltammetric Techniques: Linear-Scan (E vs Time)01:12

Voltammetric Techniques: Linear-Scan (E vs Time)

475
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...
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Related Experiment Video

Updated: Aug 27, 2025

Characterizing Electron Transport through Living Biofilms
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Pulse-opencircuit voltammetry: A novel method characterizes bioanode performance from microbe-electrode interfacial

Fengjun Yin1, Shun Lu2, Cheng Song2

  • 1Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 400714, China; Key Laboratory of Reservoir Aquatic Environment, Chinese Academy of Sciences, Chongqing, 400714, China.

Biosensors & Bioelectronics
|September 24, 2022
PubMed
Summary
This summary is machine-generated.

A new pulse-opencircuit voltammetry (POV) method characterizes bioanode resistance distribution. This technique quantifies biofilm activity and ohmic resistance, crucial for bioelectrochemical systems.

Keywords:
BioelectrochemistryMicrobe-electrode interfacial processesPolarization curvePulse-opencircuit voltammetryResistance distribution

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Area of Science:

  • Electrochemistry
  • Microbiology
  • Bioelectrochemical Systems

Background:

  • Bioanodes are essential components of bioelectrochemical systems.
  • Characterizing bioanode resistance distribution is critical but lacks established methods.

Purpose of the Study:

  • To develop and validate a novel method for characterizing bioanode resistance distribution.
  • To differentiate between reaction and ohmic resistance in biofilms.

Main Methods:

  • Pulse-opencircuit voltammetry (POV) based on microbe-electrode interfacial processes (MEIPs).
  • A dual-cathode cell for precise data acquisition.
  • Integration of potentiostatic discharge and current interruption techniques.
  • Assistance of impedance spectroscopy for material resistance measurement.

Main Results:

  • The POV method accurately measures steady-state polarization and ohmic potential loss curves.
  • Reaction resistance (RB,act) is the primary limiting factor, dependent on the catabolic state.
  • Ohmic resistance (RB,ohm) correlates with extracellular electron transfer behaviors.
  • RB,act and RB,ohm serve as dynamic biofilm evaluation indicators.

Conclusions:

  • The developed POV method provides a robust approach for bioanode characterization.
  • This technique offers valuable insights into biofilm performance and electroactive bacteria.
  • The method and cell platform have broad applications in bioanode development and research.