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Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
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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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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Reduction of Alkenes: Catalytic Hydrogenation02:13

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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
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A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions
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Hacer que la producción de hidrógeno sea duradera

Yu Seung Kim1

  • 1Materials Synthesis and Integrated Devices (MPA-11), Los Alamos National Laboratory, Los Alamos, NM, USA.

Science (New York, N.Y.)
|October 16, 2025
PubMed
Resumen

Una nueva capa de interfase protege los electrolitos del polímero de la degradación causada por la oxidación electroquímica en condiciones alcalinas, mejorando la estabilidad de la batería.

Área de la Ciencia:

  • Ciencias de los materiales
  • La electroquímica
  • Ciencias de los Polímeros

Sus antecedentes:

  • Los electrolitos poliméricos son cruciales para los dispositivos avanzados de almacenamiento de energía.
  • La oxidación electroquímica limita la estabilidad operativa de los electrolitos de polímeros, especialmente en entornos alcalinos.
  • El desarrollo de estrategias de protección es esencial para mejorar el rendimiento de los electrolitos.

Objetivo del estudio:

  • Investigar el efecto protector de una capa interfásica sobre los electrolitos del polímero.
  • Evaluar la resistencia del electrolito protegido por interfase a la oxidación electroquímica en un medio alcalino.

Principales métodos:

  • Fabricación de electrolitos poliméricos con una capa interfase protectora.
  • Se emplearon técnicas de caracterización electroquímica (por ejemplo, voltametría cíclica, espectroscopia de impedancia electroquímica).

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  • Las pruebas se llevaron a cabo en un ambiente alcalino.

    • Principales resultados:

    • La capa de interfase protegió eficazmente el electrolito del polímero del contacto directo con el electrolito alcalino.
    • Se observó una reducción significativa de la oxidación electroquímica del electrolito del polímero en presencia de la interfase.
    • El electrolito protegido demostró una mayor estabilidad bajo estrés electroquímico.

    Conclusiones:

    • Una capa de interfase puede prevenir con éxito la oxidación electroquímica de electrolitos de polímeros en medios alcalinos.
    • Esta estrategia de protección ofrece un enfoque prometedor para el desarrollo de dispositivos electroquímicos basados en electrolitos de polímeros más duraderos y fiables.
    • Una mayor investigación sobre la ingeniería interfásica puede conducir a mejores soluciones de almacenamiento de energía.