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Electrolysis03:00

Electrolysis

30.6K
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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Alkali Metals03:06

Alkali Metals

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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).
Table 1: Properties of the alkali metals
25.0K
pH Scale02:41

pH Scale

80.4K
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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Accelerators01:17

Accelerators

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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.
The effectiveness of calcium chloride can...
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Alkali Aggregate Reaction in Concrete01:26

Alkali Aggregate Reaction in Concrete

564
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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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

49.6K
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. 
49.6K

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Kilowatt-scale alkali-cation-free CO2 electrolysis via accelerating mass transfer.

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A novel high-diffusion-flux gas diffusion electrode (HDF-GDE) enables efficient, scalable electrocatalytic CO₂ reduction (ECO₂R) for industrial decarbonization. This technology achieves high CO₂ conversion rates, paving the way for carbon-neutral fuel and chemical production.

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Area of Science:

  • Electrochemistry
  • Catalysis
  • Sustainable Chemistry

Background:

  • Electrocatalytic CO₂ reduction (ECO₂R) offers a sustainable route for decarbonization, converting CO₂ into valuable products.
  • Industrial scalability of ECO₂R is currently limited by slow mass-transfer kinetics.

Purpose of the Study:

  • To develop and demonstrate a high-diffusion-flux gas diffusion electrode (HDF-GDE) for efficient ECO₂R.
  • To overcome mass-transfer limitations in alkali-cation-free ECO₂R systems.
  • To achieve industrial current densities for CO₂ conversion.

Main Methods:

  • Design and implementation of a novel HDF-GDE.
  • Kinetic analysis to determine rate-limiting factors.
  • Optimization of GDE structure for enhanced CO₂ diffusion and utilization.
  • Construction and operation of a kW-scale ECO₂R system.

Main Results:

  • The HDF-GDE enables CO₂ conversion rates at industrial current densities in alkali-cation-free systems.
  • Mass transfer efficiency, not flow rate, governs CO₂ conversion.
  • A kW-scale system demonstrated stable operation (>1000 hours) producing CO or C₂H₄.
  • The system produced 144 kg of CO or 17 kg of C₂H₄ over 1000 hours.

Conclusions:

  • The HDF-GDE effectively addresses mass-transfer limitations in ECO₂R.
  • The developed alkali-cation-free ECO₂R system is economically viable for large-scale CO/C₂H₄ production.
  • This technology bridges the gap between lab-scale research and industrial application for carbon-neutral chemical manufacturing.