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Related Concept Videos

Hydrogen Bonds01:04

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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Ion Exchange01:17

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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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Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
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The electrons of the outermost energy level determine the energetic stability of the atom and its tendency to form chemical bonds with other atoms. The innermost electron shell has a maximum capacity of two electrons, but the next two electron shells can each have a maximum of eight electrons. This is known as the octet rule, which states that, with the exception of the innermost shell, atoms are most stable energetically when they have eight electrons in their valence shell, the...
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Interlayer confinement toward short hydrogen bond network construction for fast hydroxide transport.

Ruixiang Guo1,2, Yecheng Zhou3, Wei Wang1,2

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Researchers developed a new method using bismuth oxyiodide (BiOI) nanosheets to create short hydrogen bonds (SHBs) in hydroxide exchange membranes (HEMs). This significantly boosts ionic conductivity for sustainable energy applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Highly conductive hydroxide exchange membranes (HEMs) are crucial for sustainable energy technologies.
  • Short hydrogen bonds (SHBs) are known to accelerate ion transport but are difficult to form naturally.
  • The electron-withdrawing nature of oxygen impedes the formation of SHBs in water-mediated ion transport.

Purpose of the Study:

  • To develop a strategy for constructing SHB networks in HEMs.
  • To enhance the ionic conductivity of HEMs for improved electrochemical device performance.
  • To explore the use of two-dimensional (2D) nanocapillary structures for ion transport.

Main Methods:

  • An interlayer confinement strategy was employed using bismuth oxyiodide (BiOI) nanosheets.
  • The BiOI nanosheets assembled into 2D nanocapillaries to confine hydrogen bonds.
  • Adjustable hydrophilic groups within the BiOI structure were utilized to facilitate SHB formation.

Main Results:

  • The confinement strategy successfully constructed SHB networks within the BiOI-based HEMs.
  • The number of SHBs increased 12-fold, creating efficient pathways for Grotthuss-type anion transport.
  • A high ionic conductivity of 168 mS/cm was achieved at 90°C, surpassing existing polymeric and 2D-based HEMs.

Conclusions:

  • The study demonstrates a facile approach to generating SHB networks in 2D capillaries.
  • This method significantly boosts ionic conductivity in hydroxide exchange membranes.
  • The findings open promising avenues for developing advanced HEMs for sustainable energy applications.