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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
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Hydronium and hydroxide ions are present both in pure water and in all aqueous solutions, and their concentrations are inversely proportional as determined by the ion product of water (Kw). The concentrations of these ions in a solution are often critical determinants of the solution’s properties and the chemical behaviors of its other solutes. Two different solutions can differ in their hydronium or hydroxide ion concentrations by a million, billion, or even trillion times. A common means of...
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Accelerators in concrete serve as admixtures to speed up the hardening process, enabling the concrete to achieve early strength faster. Although accelerators do not necessarily impact the time it takes concrete to set, they reduce this time in practice. A common accelerator is calcium chloride, which is particularly useful for hastening early strength development in cold weather or for rapid repair jobs that require quick heat generation after mixing.
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The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...
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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Electrolisis de CO2 libre de cationes alcalinos a escala de kilovatios a través de la aceleración de la transferencia

Xiaojie She1,2,3, Zhihang Xu1, Qiang Ma2

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Un nuevo electrodo de difusión de gas de alto flujo de difusión (HDF-GDE) permite una reducción electrocatalítica de CO2 (ECO2R) eficiente y escalable para la descarbonización industrial. Esta tecnología logra altas tasas de conversión de CO2, allanando el camino para la producción de combustibles y productos químicos neutros en carbono.

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Área de la Ciencia:

  • La electroquímica es electroquímica.
  • La catálisis de la catálisis.
  • Química Sostenible y Sustentable.

Sus antecedentes:

  • La reducción electrocatalítica de CO2 (ECO2R) ofrece una ruta sostenible para la descarbonización, convirtiendo el CO2 en productos valiosos.
  • La escalabilidad industrial de ECO2R está actualmente limitada por la cinética de la transferencia de masa lenta.

Objetivo del estudio:

  • Desarrollar y demostrar un electrodo de difusión de gas de alto flujo de difusión (HDF-GDE) para un ECO2R eficiente.
  • Para superar las limitaciones de transferencia de masa en los sistemas ECO2R libres de cationes alcalinos.
  • Para lograr densidades de corriente industriales para la conversión de CO2.

Principales métodos:

  • Diseño e implementación de un nuevo HDF-GDE.
  • Análisis cinético para determinar los factores limitantes de velocidad.
  • Optimización de la estructura de GDE para una mayor difusión y utilización de CO2.
  • Construcción y operación de un sistema ECO2R a escala de kW.

Principales resultados:

  • El HDF-GDE permite tasas de conversión de CO2 en densidades de corriente industriales en sistemas libres de cationes alcalinos.
  • La eficiencia de la transferencia de masa, no la velocidad de flujo, rige la conversión de CO2.
  • Un sistema a escala de kW demostró un funcionamiento estable (>1000 horas) produciendo CO o C2H4.4.
  • El sistema produjo 144 kg de CO o 17 kg de C2H4 durante 1000 horas.

Conclusiones:

  • El HDF-GDE aborda efectivamente las limitaciones de transferencia de masa en ECO2R.
  • El sistema ECO2R desarrollado, libre de cationes alcalinos, es económicamente viable para la producción a gran escala de CO/C2H4.
  • Esta tecnología cierra la brecha entre la investigación a escala de laboratorio y la aplicación industrial para la fabricación de productos químicos neutros en carbono.