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Related Concept Videos

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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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Potentiometry: Types of Electrodes01:19

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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.
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Phase Transitions: Melting and Freezing02:39

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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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Thermal Scanning Conductometry TSC as a General Method for Studying and Controlling the Phase Behavior of Conductive Physical Gels
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Ionic Switches with Positive Temperature Coefficient Enabled by Phase Separation within Hydrogel Electrolytes.

Xiaoqing Ming1, Yang Xiang1, Le Yao1

  • 1School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Shenzhen, Guangdong518172, P.R. China.

ACS Applied Materials & Interfaces
|October 6, 2022
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Summary
This summary is machine-generated.

This study introduces a novel solid-state ionic switch using poly(acrylic acid) hydrogel and calcium acetate. This device offers enhanced safety for electrochemical energy storage by preventing liquid leaking and volume shrinking.

Keywords:
hydrogelionic switchphase separationpositive temperature coefficientsupercapacitor

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Ionic switches are crucial for smart electrolytes in energy devices.
  • Existing ionic switches face challenges like liquid leaking and volume shrinkage.
  • Developing stable, solid-state ionic switches is essential for device longevity.

Purpose of the Study:

  • To develop a novel positive temperature coefficient (PTC) ionic switch.
  • To address limitations of current ionic switches, focusing on stability and safety.
  • To demonstrate a new pathway for designing PTC ionic switches for energy storage devices.

Main Methods:

  • Fabrication of a poly(acrylic acid) (PAA) hydrogel soaked with calcium acetate (CaAc).
  • Investigation of the PTC effect attributed to heating-induced phase separation.
  • Microstructure analysis to propose an ion channel model.
  • Demonstration of a smart supercapacitor utilizing the PTC ionic switch.

Main Results:

  • A stable, solid-state PTC ionic switch was successfully developed.
  • The switch exhibited a significant resistance change (six times) due to phase separation.
  • The device operated without liquid leaking or volume shrinking.
  • A smart supercapacitor with safety protection was demonstrated.

Conclusions:

  • The PAA/CaAc hydrogel-based PTC ionic switch offers a stable and safe alternative.
  • The solid-state, isochoric nature overcomes limitations of conventional ionic switches.
  • This research provides a new strategy for PTC ionic switch development in electrochemical energy storage.