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Related Concept Videos

Porosity in Cement Paste01:18

Porosity in Cement Paste

142
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is...
142

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Metal-Assisted Electrochemical Nanoimprinting of Porous and Solid Silicon Wafers
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Beyond Conventional Carbon Activation: Creating Porosity without Etching Using Cesium Effect.

Jiaxin Li1, Yaolin Xu2, Pengzhou Li3

  • 1Colloid Chemistry Department, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476, Potsdam, Germany.

Advanced Materials (Deerfield Beach, Fla.)
|January 19, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel, non-etching method to create high-surface-area porous carbons from cesium salts. This approach yields up to 25% and 3008 m2 g-1 specific surface area, ideal for energy storage applications.

Keywords:
Zn‐ion capacitorsactivationcesium effectmolecular precursorsporous carbon

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Conventional methods for porous carbon synthesis often involve etching, leading to low yields and limited control over porosity.
  • High specific surface area (SSA) porous carbons are crucial for advanced applications like energy storage.
  • Existing activation methods struggle to achieve high SSAs (>2000 m2 g-1) with good yields and controlled porosity.

Purpose of the Study:

  • To develop a facile, non-etching synthesis strategy for high-yield, high-SSA porous carbons.
  • To investigate the mechanism of cesium-based activation for porous carbon formation.
  • To evaluate the performance of the synthesized porous carbons in zinc-ion capacitors.

Main Methods:

  • Utilized cesium salts of carboxylic acids as precursors for porous carbon synthesis.
  • Employed a non-etching activation strategy, varying synthesis temperature and precursor type.
  • Characterized the porous carbons' structure, porosity, and composition.
  • Investigated the role of in-situ formed cesium compounds in the activation process.
  • Fabricated and tested zinc-ion capacitors using the synthesized porous carbons as cathodes.

Main Results:

  • Achieved porous carbons with yields up to 25% and SSAs reaching 3008 m2 g-1.
  • Demonstrated control over pore size and oxygen content by adjusting synthesis parameters.
  • Unraveled the non-classical activation mechanism involving cesium compounds and electron injection.
  • The synthesized porous carbons exhibited high capacity (252 mAh g-1) and excellent durability (100,000 cycles) in Zn-ion capacitors.

Conclusions:

  • A novel, non-etching activation strategy using cesium salts offers a high-yield route to tailored porous carbons.
  • Cesium's unique electronic properties facilitate pore formation through a non-classical mechanism.
  • The resulting porous carbons show significant promise for high-performance electrochemical energy storage devices.