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相关概念视频

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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超越传统的碳激活:使用效应在没有蚀刻的情况下创造孔隙.

Jiaxin Li1, Yaolin Xu2, Pengzhou Li3

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

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概括
此摘要是机器生成的。

研究人员开发了一种新的,非蚀刻的方法,从盐中制造出高表面积的多孔碳. 这种方法可产生高达25%和3008m2 g-1的特定表面积,非常适合储能应用.

关键词:
离子电容器的电容器激活方式 激活方式效应是一种效应.它们是分子前体.有孔的碳是多孔的碳

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 纳米技术 纳米技术

背景情况:

  • 孔隙碳合成的传统方法通常涉及蚀刻,导致产量低,对孔隙性的控制有限.
  • 高特定表面积 (SSA) 的多孔碳对于先进的应用,如储能,至关重要.
  • 现有的激活方法很难达到高的SSA (>2000m2 g-1) 具有良好的产量和可控的多孔性.

研究的目的:

  • 为高产量,高SSA多孔碳素开发一种简单,无蚀刻的合成策略.
  • 研究基于的激活机制,以形成多孔碳的机制.
  • 为了评估离子电容器中合成的多孔碳的性能.

主要方法:

  • 利用碳酸的盐作为多孔碳合成的前体.
  • 采用非蚀刻激活策略,可变合成温度和前体类型.
  • 描述了多孔碳的结构,多孔性和组成.
  • 研究了现场形成的化合物在激活过程中的作用.
  • 使用合成的多孔碳作为阴极制造和测试离子电容器.

主要成果:

  • 实现多孔碳的产量高达25%,SSAs达到3008m2g-1 .
  • 通过调整合成参数来证明对孔径大小和氧含量的控制.
  • 解开了涉及化合物和电子注入的非经典激活机制.
  • 在Zn离子电容器中,合成的多孔碳具有高容量 (252 mAh g-1) 和优异的耐用性 (100,000 个周期).

结论:

  • 使用盐的新型非蚀刻激活策略为量身定制的多孔碳提供了高收益的途径.
  • 的独特电子特性通过一种非经典的机制促进孔隙形成.
  • 由此产生的多孔碳显示出对高性能电化学能量储存设备的显著前景.