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Standard Electrode Potentials03:02

Standard Electrode Potentials

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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...
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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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The relative difference in electrical charge, or voltage, between the inside and the outside of a cell membrane, is called the membrane potential. It is generated by differences in permeability of the membrane to various ions and the concentrations of these ions across the membrane.
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Thermodynamics of a Redox Reaction
Thermodynamics is the branch of physics dealing with the relationship between heat and other forms of energy. In an electrochemical cell, chemical energy is converted into electrical energy.
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A device consisting of two electrical conductors that are separated by a distance and used to store electrical charges is called a capacitor. The space between the conductors is either a vacuum or an insulating material, called a dielectric. Capacitors have many applications, ranging from filtering static from radio reception to energy storage in heart defibrillators.
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A stable operation method for membrane capacitive deionization systems without electrode reactions at high cell

Jae-Hwan Choi1, Duck-Jin Yoon1

  • 1Department of Chemical Engineering, Kongju National University, 1223-24 Cheonan-daero, Seobuk-gu, Cheonan, Chungnam, 31080, South Korea.

Water Research
|April 7, 2019
PubMed
Summary

Researchers controlled charge in membrane capacitive deionization (MCDI) systems to prevent electrode reactions at high potentials. This method enhances stable operation and improves desalination performance without compromising effluent quality.

Keywords:
Cell potentialElectrode potentialElectrode reactionMaximum allowable chargeMembrane capacitive deionizationVoltage drop

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Area of Science:

  • Electrochemistry
  • Water Treatment Technologies
  • Materials Science

Background:

  • Membrane capacitive deionization (MCDI) is a promising technology for water desalination.
  • Electrode reactions can limit MCDI performance and stability at high cell potentials.
  • Controlling charge is crucial for suppressing unwanted Faradaic reactions.

Purpose of the Study:

  • To investigate a method for operating MCDI systems without electrode reactions at high cell potentials.
  • To determine the maximum allowable charge (MAC) for carbon electrodes to prevent Faradaic reactions.
  • To evaluate the impact of charge control on desalination performance and effluent stability.

Main Methods:

  • Controlled the charge supplied to the MCDI cell to suppress Faradaic reactions.
  • Measured the maximum allowable charge (MAC) for carbon electrodes.
  • Conducted adsorption experiments using constant-current (CC) and constant-voltage (CV) modes at 95% of MAC.
  • Analyzed effluent concentration, pH, salt adsorption capacity, and charge efficiency.

Main Results:

  • The MAC for carbon electrodes was determined to be 58 C/g.
  • Stable effluent concentration and pH were maintained at high cell potentials (up to 1.42 V in CC mode and 2.0 V in CV mode).
  • Salt adsorption capacity reached approximately 15.5 mg/g with a charge efficiency of 92%, irrespective of applied current densities and cell potentials.
  • High cell resistance at elevated potentials likely prevented electrode reactions due to voltage drop.

Conclusions:

  • Operating MCDI systems by controlling charge below the MAC effectively suppresses electrode reactions at high cell potentials.
  • This approach ensures stable effluent quality and enhances desalination rates.
  • The MAC concept is a valuable strategy for improving the stability and performance of MCDI systems.