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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

848
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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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Multi-analyte Biochip MAB Based on All-solid-state Ion-selective Electrodes ASSISE for Physiological Research
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All-Solid-State Polymeric Membrane Ion-Selective Electrodes Based on NiCo2S4 as a Solid Contact.

Yanhong Li1,2, Jinghui Li1, Wei Qin1,3,4

  • 1CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Chinese Academy of Sciences (CAS); Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai Institute of Coastal Zone Research (YIC), Yantai 264003, Shandong, P.R. China.

Analytical Chemistry
|February 17, 2022
PubMed
Summary
This summary is machine-generated.

Nickel cobalt sulfide (NiCo2S4) was used as a solid contact in calcium ion-selective electrodes (Ca2+-ISEs), achieving high reproducibility and stability. This novel material offers a promising alternative for calibration-free all-solid-state ion-selective electrodes.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Analytical Chemistry

Background:

  • All-solid-state ion-selective electrodes (ASS-ISEs) require high reproducibility and low potential drift for optimal performance.
  • Developing stable and reliable solid contacts is crucial for advancing ASS-ISE technology.

Purpose of the Study:

  • To introduce nickel cobalt sulfide (NiCo2S4) as a novel solid contact material for ion-to-electron transduction in ASS-ISEs.
  • To develop and characterize a Ca2+-ISE utilizing NiCo2S4 as the solid contact.

Main Methods:

  • Synthesis of NiCo2S4 materials with varying morphologies via hydrothermal/solvothermal methods.
  • Fabrication and electrochemical evaluation of a NiCo2S4-based solid-contact Ca2+-ISE.
  • Assessment of electrode performance, including Nernstian slope, detection limit, potential drift, and interference resistance.

Main Results:

  • The NiCo2S4-based Ca2+-ISE exhibited a Nernstian slope of 27.5 ± 0.2 mV/dec over a wide activity range (1.0 × 10-6 to 2.9 × 10-2 M) with a detection limit of 5.0 × 10-7 M.
  • A low standard potential variation (0.35 mV) and exceptional potential stability (2.2 ± 0.4 μV/h) were achieved due to high redox capacitance (565 μF).
  • The electrode demonstrated reduced water layer formation and resistance to light, O2, and CO2 interferences.

Conclusions:

  • NiCo2S4 is a highly effective solid contact material for Ca2+-ISEs, offering superior redox capacitance and stability.
  • The proposed NiCo2S4 solid contact strategy is a promising advancement for fabricating calibration-free ASS-ISEs.
  • This work paves the way for more robust and reliable ion-selective electrode designs.