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関連する概念動画

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...
30.6K
Alkali Metals03:06

Alkali Metals

25.0K
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...
80.4K
Accelerators01:17

Accelerators

292
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...
292
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...
564
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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関連する実験動画

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Extraction of Ramie Fiber in Alkali Hydrogen Peroxide System Supported by Controlled-release Alkali Source
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キロワット級アルカリカチオンフリーCO₂電気分解による物質移動の加速

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

  • 1Department of Applied Physics, Research Institute for Smart Energy, Photonics Research Institute, Research Centre for Deep Space Explorations, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, P. R. China.

Nature communications
|February 11, 2026
PubMed
まとめ

新規高拡散流束ガス拡散電極（HDF-GDE）は、工業用脱炭素化のための効率的でスケーラブルな電気化学的CO₂還元（ECO₂R）を可能にします。この技術は高いCO₂変換率を達成し、炭素中立燃料および化学品製造への道を開きます。

キーワード:
電気化学的CO₂還元ガス拡散電極物質移動炭素中立燃料脱炭素化工業規模アルカリカチオンフリー

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科学分野:

  • 電気化学
  • 触媒
  • 持続可能な化学

背景:

  • 電気化学的CO₂還元（ECO₂R）は、CO₂を価値ある製品に変換することにより、脱炭素化のための持続可能なルートを提供します。
  • ECO₂Rの工業的スケーラビリティは、現在、遅い物質移動速度によって制限されています。

研究 の 目的:

  • 効率的なECO₂Rのための高拡散流束ガス拡散電極（HDF-GDE）を開発および実証すること。
  • アルカリカチオンフリーECO₂Rシステムにおける物質移動の制限を克服すること。
  • CO₂変換のための工業用電流密度を達成すること。

主な方法:

  • 新規HDF-GDEの設計と実装。
  • 律速段階を決定するための速度論的解析。
  • CO₂拡散と利用を強化するためのGDE構造の最適化。
  • kW級ECO₂Rシステムの構築と運用。

主要な成果:

  • HDF-GDEは、アルカリカチオンフリーシステムにおいて、工業用電流密度でのCO₂変換を可能にします。
  • CO₂変換を制御するのは、流量ではなく物質移動効率です。
  • kW級システムは、COまたはC₂H₄を生成する安定した動作（1000時間以上）を実証しました。
  • このシステムは、1000時間で144 kgのCOまたは17 kgのC₂H₄を生成しました。

結論:

  • HDF-GDEは、ECO₂Rにおける物質移動の制限を効果的に解決します。
  • 開発されたアルカリカチオンフリーECO₂Rシステムは、大規模なCO/C₂H₄生産において経済的に実行可能です。
  • この技術は、炭素中立化学製造のための実験室規模の研究と工業的応用の間のギャップを埋めます。