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Related Concept Videos

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
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Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device
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A miniaturized solid salt reverse electrodialysis battery: a durable and fully ionic power source.

Song Yi Yeon1, Jeongse Yun1, Sun-Heui Yoon1

  • 1Department of Chemistry , Seoul National University , Seoul , 08826 , Republic of Korea .

Chemical Science
|December 14, 2018
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Summary
This summary is machine-generated.

A new miniaturized solid salt reverse electrodialysis (ssRED) system generates power from salinity gradients without pumps. This portable device uses solid salts and precipitation reactions for sustained ionic electricity generation.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Harvesting

Background:

  • Reverse electrodialysis (RED) systems typically require pumps and liquid electrolytes.
  • Miniaturization of power sources for portable electronics remains a challenge.
  • Sustainable and efficient energy harvesting from natural gradients is highly desirable.

Purpose of the Study:

  • To design and demonstrate a novel pump-free miniaturized reverse electrodialysis (RED) system.
  • To develop a portable and flexible ionic power source using solid salts.
  • To enable sustained electricity generation from salinity gradients without external pumping.

Main Methods:

  • Development of a solid salt RED (ssRED) system utilizing precipitation reactions (PssRED).
  • Integration of the PssRED system with bipolar electrode (BPE) microchip sensors.
  • Formation of a fully ionic circuit using a polyelectrolyte ionic diode.

Main Results:

  • Successful design and operation of a miniaturized, pump-free ssRED system.
  • Demonstration of sustained electricity generation via precipitation-assisted reactions.
  • Stable power output achieved for coupling with BPE microchip sensors.

Conclusions:

  • The precipitation-assisted solid salt RED (PssRED) offers a novel, pump-free ionic power source.
  • The PssRED system provides a portable, flexible, and easily activated solution for energy harvesting.
  • This technology holds potential for powering various devices through ionic charge flow.