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Related Concept Videos

Potentiometry: Overview01:06

Potentiometry: Overview

2.9K
Potentiometry is an analytical technique that measures the potential difference between two electrodes in an electrochemical cell without drawing any significant current that could alter the solution's composition. This method employs an indicator electrode, which exchanges electrons with the analyte solution, and a reference electrode with a constant potential. Each electrode is immersed in a solution comprised of two half-cells. In a conventional setup, the reference electrode serves as...
2.9K
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

835
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...
835
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

967
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...
967
Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

305
Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
305
Potentiometer01:30

Potentiometer

1.2K
Voltage and current measurements using a standard voltmeter and ammeter alter the circuit being measured either by drawing or resisting the current flow, which introduces uncertainties in the measurements. Null measurements balance the voltages so that no current flows through the measuring device and, therefore, no alterations occur in the measured circuit.
Suppose the emf of a battery needs to be measured. If the battery is directly connected to a standard voltmeter, the measured quantity is...
1.2K
Standard Electrode Potentials03:02

Standard Electrode Potentials

45.2K
On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
45.2K

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Related Experiment Video

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Potentiodynamic Corrosion Testing
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PassStat, a simple but fast, precise and versatile open source potentiostat.

Mélicia Caux1, Anis Achit1, Kethsovann Var1

  • 1Sorbonne Université, CNRS, Laboratoire Interfaces et Systèmes Electrochimiques, 4 place Jussieu, 75005 Paris, France.

Hardwarex
|May 5, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces four low-cost, open-source potentiostat solutions for electrochemistry. These affordable devices enable accurate cyclic voltammetry and square wave voltammetry measurements, even with ultramicroelectrodes.

Keywords:
Analytical chemistryCyclic voltammetryOpen hardwarePotentiostatSquare wave voltammetryUltramicroelectrodes

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Area of Science:

  • Electrochemistry
  • Instrumentation
  • Open-source hardware

Background:

  • Accurate electrochemical measurements are crucial in various scientific fields.
  • Existing potentiostat solutions can be prohibitively expensive, limiting accessibility.
  • There is a need for low-cost, reproducible instrumentation for research and education.

Purpose of the Study:

  • To develop and present four open-source potentiostat solutions.
  • To enable accurate cyclic voltammetry (CV) and square wave voltammetry (SWV) measurements at a low cost.
  • To provide accessible instrumentation for diverse settings, including education and resource-limited regions.

Main Methods:

  • Designed a simple, reproducible analogic board (approx. €10).
  • Integrated the board with a Teensy microcontroller (Arduino/Python software, €39) or an Analog Discovery 2 (Digilent, <€300).
  • Developed a smartphone Bluetooth Android interface to eliminate the need for a computer.

Main Results:

  • Demonstrated suitability for classical electrochemical conditions and ultramicroelectrode experiments.
  • Achieved a noise resolution of less than 1 picoampere (pA).
  • Reached scan rates of 8000 V/s with ohmic drop compensation.

Conclusions:

  • The developed open-source potentiostats offer accurate electrochemical measurements at a significantly reduced cost.
  • The solutions are versatile, suitable for teaching, citizen science, and researchers in financially constrained areas.
  • The system provides high performance, including low noise and high scan rates, comparable to more expensive commercial instruments.