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相关概念视频

Types of Reversible Electrodes01:24

Types of Reversible Electrodes

7
For electrode reversibility to be maintained, all the reactants and products involved in the half-reaction must be present at the electrode. There are several types of reversible electrodes (half-cells).In metal-metal-ion electrodes, a metal balances electrochemically with a solution of its own ions. Examples are Cu2+|Cu and Zn2+|Zn. Metals that react with the solvent, like group 1 and most group 2 metals, which react with water, and zinc, which reacts with aqueous acidic solutions, cannot be...
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The Electrical Double Layer01:30

The Electrical Double Layer

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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
249

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用于大量生产石墨烯氧化物的双阶段电化学间隔和氧化

Jianyun Cao1, Pei He1, Mahdi A Mohammed1

  • 1School of Materials, University of Manchester , Oxford Road, Manchester, M13 9PL, U.K.

Journal of the American Chemical Society
|November 2, 2017
PubMed
概括
此摘要是机器生成的。

一种新的两步电化学方法有效地产生高质量的石墨烯氧化物 (GO),产量超过70%. 这种可扩展的工艺产生了适用于先进电化学电容器的高导电性降低的GO.

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科学领域:

  • 材料科学
  • 电化学
  • 纳米技术

背景情况:

  • 传统的石墨烯氧化物 (GO) 生产方法,如哈默斯的方法,涉及危险的化学物质,造成环境和安全风险.
  • 现有的电化学氧化方法用于GO合成,由于氧化不均,通常产量较低.

研究的目的:

  • 开发一种可扩展,安全和高效的电化学方法来生产高质量的氧化石墨烯 (GO).
  • 研究合成的GO及其用于储能应用的减少形式的特性.

主要方法:

  • 在硫酸中形成石墨间化合物 (GIC) 的两步电化学方法.
  • 在0.1M硫酸溶液中氧化和剥离第一阶段GIC.
  • 随后对产生的GO进行深度缩,以获得具有高导电性的减少氧化石墨烯 (rGO).

主要成果:

  • 获得高产量 (>70重量%) 的GO质量好 (>90%单层) 和合理的氧含量 (17.7). 百分之一).
  • 合成的rGO含氧量低 (3.2度). %) 和高电导率 (54,600 S m-1).
  • 使用 rGO 制造的电化学电容器表现出超高速率的能力 (高达 10 V s-1).

结论:

  • 开发的两步电化学方法为GO生产提供了安全,可扩展和高产的替代方案.
  • 由此产生的高导电性rGO对高性能电化学储能装置,特别是超级电容器具有前景.